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* get rid of the address_space override in setsockopt
@ 2020-07-20 12:47 Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 01/24] bpfilter: reject kernel addresses Christoph Hellwig
                   ` (27 more replies)
  0 siblings, 28 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Hi Dave,

setsockopt is the last place in architecture-independ code that still
uses set_fs to force the uaccess routines to operate on kernel pointers.

This series adds a new sockptr_t type that can contained either a kernel
or user pointer, and which has accessors that do the right thing, and
then uses it for setsockopt, starting by refactoring some low-level
helpers and moving them over to it before finally doing the main
setsockopt method.

Note that I could not get the eBPF selftests to work, so this has been
tested with a testing patch that always copies the data first and passes
a kernel pointer.  This is something that works for most common sockopts
(and is something that the ePBF support relies on), but unfortunately
in various corner cases we either don't use the passed in length, or in
one case actually copy data back from setsockopt, so we unfortunately
can't just always do the copy in the highlevel code, which would have
been much nicer.


Diffstt:
 crypto/af_alg.c                           |    7 
 drivers/crypto/chelsio/chtls/chtls_main.c |   18 -
 drivers/isdn/mISDN/socket.c               |    4 
 include/linux/bpfilter.h                  |    6 
 include/linux/filter.h                    |    3 
 include/linux/mroute.h                    |    5 
 include/linux/mroute6.h                   |    8 
 include/linux/net.h                       |    4 
 include/linux/netfilter.h                 |    6 
 include/linux/netfilter/x_tables.h        |    4 
 include/linux/sockptr.h                   |  121 +++++++++++
 include/net/inet_connection_sock.h        |    3 
 include/net/ip.h                          |    7 
 include/net/ipv6.h                        |    6 
 include/net/sctp/structs.h                |    2 
 include/net/sock.h                        |    7 
 include/net/tcp.h                         |    6 
 include/net/udp.h                         |    2 
 include/net/xfrm.h                        |    8 
 net/atm/common.c                          |    6 
 net/atm/common.h                          |    2 
 net/atm/pvc.c                             |    2 
 net/atm/svc.c                             |    6 
 net/ax25/af_ax25.c                        |    6 
 net/bluetooth/hci_sock.c                  |    8 
 net/bluetooth/l2cap_sock.c                |   22 +-
 net/bluetooth/rfcomm/sock.c               |   12 -
 net/bluetooth/sco.c                       |    6 
 net/bpfilter/bpfilter_kern.c              |   11 -
 net/bridge/netfilter/ebtables.c           |   46 +---
 net/caif/caif_socket.c                    |    8 
 net/can/j1939/socket.c                    |   12 -
 net/can/raw.c                             |   16 -
 net/core/filter.c                         |    6 
 net/core/sock.c                           |   36 +--
 net/dccp/dccp.h                           |    2 
 net/dccp/proto.c                          |   20 -
 net/decnet/af_decnet.c                    |   13 -
 net/ieee802154/socket.c                   |    6 
 net/ipv4/bpfilter/sockopt.c               |    8 
 net/ipv4/ip_options.c                     |   43 +---
 net/ipv4/ip_sockglue.c                    |   66 +++---
 net/ipv4/ipmr.c                           |   14 -
 net/ipv4/netfilter/arp_tables.c           |   33 +--
 net/ipv4/netfilter/ip_tables.c            |   29 +-
 net/ipv4/raw.c                            |    8 
 net/ipv4/tcp.c                            |   30 +-
 net/ipv4/tcp_ipv4.c                       |    4 
 net/ipv4/udp.c                            |   11 -
 net/ipv4/udp_impl.h                       |    4 
 net/ipv6/ip6_flowlabel.c                  |  317 ++++++++++++++++--------------
 net/ipv6/ip6mr.c                          |   17 -
 net/ipv6/ipv6_sockglue.c                  |  203 +++++++++----------
 net/ipv6/netfilter/ip6_tables.c           |   28 +-
 net/ipv6/raw.c                            |   10 
 net/ipv6/tcp_ipv6.c                       |    4 
 net/ipv6/udp.c                            |    7 
 net/ipv6/udp_impl.h                       |    4 
 net/iucv/af_iucv.c                        |    4 
 net/kcm/kcmsock.c                         |    6 
 net/l2tp/l2tp_ppp.c                       |    4 
 net/llc/af_llc.c                          |    4 
 net/mptcp/protocol.c                      |   12 -
 net/netfilter/ipvs/ip_vs_ctl.c            |    4 
 net/netfilter/nf_sockopt.c                |    2 
 net/netfilter/x_tables.c                  |   20 -
 net/netlink/af_netlink.c                  |    4 
 net/netrom/af_netrom.c                    |    4 
 net/nfc/llcp_sock.c                       |    6 
 net/packet/af_packet.c                    |   39 +--
 net/phonet/pep.c                          |    4 
 net/rds/af_rds.c                          |   30 +-
 net/rds/rdma.c                            |   14 -
 net/rds/rds.h                             |    6 
 net/rose/af_rose.c                        |    4 
 net/rxrpc/af_rxrpc.c                      |    8 
 net/rxrpc/ar-internal.h                   |    4 
 net/rxrpc/key.c                           |    9 
 net/sctp/socket.c                         |    4 
 net/smc/af_smc.c                          |    4 
 net/socket.c                              |   20 -
 net/tipc/socket.c                         |    8 
 net/tls/tls_main.c                        |   17 -
 net/vmw_vsock/af_vsock.c                  |    4 
 net/x25/af_x25.c                          |    4 
 net/xdp/xsk.c                             |    8 
 net/xfrm/xfrm_state.c                     |    6 
 87 files changed, 855 insertions(+), 721 deletions(-)

^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 01/24] bpfilter: reject kernel addresses
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 02/24] bpfilter: fix up a sparse annotation Christoph Hellwig
                   ` (26 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

When feeding addresses to userspace we can't support kernel addresses
that were fed under set_fs(KERNEL_DS) from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/bpfilter/bpfilter_kern.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 2c31e82cb953af..977e9dad72ca4f 100644
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -41,6 +41,11 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
 	ssize_t n;
 	int ret = -EFAULT;
 
+	if (uaccess_kernel()) {
+		pr_err("kernel access not supported\n");
+		return -EFAULT;
+	}
+
 	req.is_set = is_set;
 	req.pid = current->pid;
 	req.cmd = optname;
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 02/24] bpfilter: fix up a sparse annotation
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 01/24] bpfilter: reject kernel addresses Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-21  2:40   ` Luc Van Oostenryck
  2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
                   ` (25 subsequent siblings)
  27 siblings, 1 reply; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

The __user doesn't make sense when casting to an integer type.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/bpfilter/bpfilter_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 977e9dad72ca4f..713b4b3d02005d 100644
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -49,7 +49,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
 	req.is_set = is_set;
 	req.pid = current->pid;
 	req.cmd = optname;
-	req.addr = (long __force __user)optval;
+	req.addr = (__force long)optval;
 	req.len = optlen;
 	if (!bpfilter_ops.info.tgid)
 		goto out;
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 01/24] bpfilter: reject kernel addresses Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 02/24] bpfilter: fix up a sparse annotation Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 16:37   ` Eric Biggers
  2020-07-21 10:14   ` David Laight
  2020-07-20 12:47 ` [PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t Christoph Hellwig
                   ` (24 subsequent siblings)
  27 siblings, 2 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Add a uptr_t type that can hold a pointer to either a user or kernel
memory region, and simply helpers to copy to and from it.  For
architectures like x86 that have non-overlapping user and kernel
address space it just is a union and uses a TASK_SIZE check to
select the proper copy routine.  For architectures with overlapping
address spaces a flag to indicate the address space is used instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/sockptr.h | 121 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 include/linux/sockptr.h

diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
new file mode 100644
index 00000000000000..e41dfa52555dec
--- /dev/null
+++ b/include/linux/sockptr.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020 Christoph Hellwig.
+ *
+ * Support for "universal" pointers that can point to either kernel or userspace
+ * memory.
+ */
+#ifndef _LINUX_SOCKPTR_H
+#define _LINUX_SOCKPTR_H
+
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+typedef union {
+	void		*kernel;
+	void __user	*user;
+} sockptr_t;
+
+static inline bool sockptr_is_kernel(sockptr_t sockptr)
+{
+	return (unsigned long)sockptr.kernel >= TASK_SIZE;
+}
+
+static inline sockptr_t KERNEL_SOCKPTR(void *p)
+{
+	return (sockptr_t) { .kernel = p };
+}
+#else /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */
+typedef struct {
+	union {
+		void		*kernel;
+		void __user	*user;
+	};
+	bool		is_kernel : 1;
+} sockptr_t;
+
+static inline bool sockptr_is_kernel(sockptr_t sockptr)
+{
+	return sockptr.is_kernel;
+}
+
+static inline sockptr_t KERNEL_SOCKPTR(void *p)
+{
+	return (sockptr_t) { .kernel = p, .is_kernel = true };
+}
+#endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */
+
+static inline sockptr_t USER_SOCKPTR(void __user *p)
+{
+	return (sockptr_t) { .user = p };
+}
+
+static inline bool sockptr_is_null(sockptr_t sockptr)
+{
+	return !sockptr.user && !sockptr.kernel;
+}
+
+static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
+{
+	if (!sockptr_is_kernel(src))
+		return copy_from_user(dst, src.user, size);
+	memcpy(dst, src.kernel, size);
+	return 0;
+}
+
+static inline int copy_to_sockptr(sockptr_t dst, const void *src, size_t size)
+{
+	if (!sockptr_is_kernel(dst))
+		return copy_to_user(dst.user, src, size);
+	memcpy(dst.kernel, src, size);
+	return 0;
+}
+
+static inline void *memdup_sockptr(sockptr_t src, size_t len)
+{
+	void *p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);
+
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+	if (copy_from_sockptr(p, src, len)) {
+		kfree(p);
+		return ERR_PTR(-EFAULT);
+	}
+	return p;
+}
+
+static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
+{
+	char *p = kmalloc_track_caller(len + 1, GFP_KERNEL);
+
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+	if (copy_from_sockptr(p, src, len)) {
+		kfree(p);
+		return ERR_PTR(-EFAULT);
+	}
+	p[len] = '\0';
+	return p;
+}
+
+static inline void sockptr_advance(sockptr_t sockptr, size_t len)
+{
+	if (sockptr_is_kernel(sockptr))
+		sockptr.kernel += len;
+	else
+		sockptr.user += len;
+}
+
+static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
+{
+	if (sockptr_is_kernel(src)) {
+		size_t len = min(strnlen(src.kernel, count - 1) + 1, count);
+
+		memcpy(dst, src.kernel, len);
+		return len;
+	}
+	return strncpy_from_user(dst, src.user, count);
+}
+
+#endif /* _LINUX_SOCKPTR_H */
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (2 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 05/24] net: switch sock_setbindtodevice " Christoph Hellwig
                   ` (23 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/filter.h | 3 ++-
 net/core/filter.c      | 6 +++---
 net/core/sock.c        | 6 ++++--
 net/packet/af_packet.c | 4 ++--
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4d049c8e1fbeaa..87954ef126df77 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -20,6 +20,7 @@
 #include <linux/kallsyms.h>
 #include <linux/if_vlan.h>
 #include <linux/vmalloc.h>
+#include <linux/sockptr.h>
 #include <crypto/sha.h>
 
 #include <net/sch_generic.h>
@@ -1276,6 +1277,6 @@ struct bpf_sockopt_kern {
 	s32		retval;
 };
 
-int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len);
+int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len);
 
 #endif /* __LINUX_FILTER_H__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index 2bf6624796d86f..4cc1d381a273fd 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -77,14 +77,14 @@
 #include <net/transp_v6.h>
 #include <linux/btf_ids.h>
 
-int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len)
+int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len)
 {
 	if (in_compat_syscall()) {
 		struct compat_sock_fprog f32;
 
 		if (len != sizeof(f32))
 			return -EINVAL;
-		if (copy_from_user(&f32, src, sizeof(f32)))
+		if (copy_from_sockptr(&f32, src, sizeof(f32)))
 			return -EFAULT;
 		memset(dst, 0, sizeof(*dst));
 		dst->len = f32.len;
@@ -92,7 +92,7 @@ int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len)
 	} else {
 		if (len != sizeof(*dst))
 			return -EINVAL;
-		if (copy_from_user(dst, src, sizeof(*dst)))
+		if (copy_from_sockptr(dst, src, sizeof(*dst)))
 			return -EFAULT;
 	}
 
diff --git a/net/core/sock.c b/net/core/sock.c
index d828bfe1c47dfa..91224709869389 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1062,7 +1062,8 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	case SO_ATTACH_FILTER: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
+					       optlen);
 		if (!ret)
 			ret = sk_attach_filter(&fprog, sk);
 		break;
@@ -1083,7 +1084,8 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	case SO_ATTACH_REUSEPORT_CBPF: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
+					       optlen);
 		if (!ret)
 			ret = sk_reuseport_attach_filter(&fprog, sk);
 		break;
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index c240fb5de3f014..d8d4f78f78e451 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1536,7 +1536,7 @@ static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
 	}
 }
 
-static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
+static int fanout_set_data_cbpf(struct packet_sock *po, sockptr_t data,
 				unsigned int len)
 {
 	struct bpf_prog *new;
@@ -1584,7 +1584,7 @@ static int fanout_set_data(struct packet_sock *po, char __user *data,
 {
 	switch (po->fanout->type) {
 	case PACKET_FANOUT_CBPF:
-		return fanout_set_data_cbpf(po, data, len);
+		return fanout_set_data_cbpf(po, USER_SOCKPTR(data), len);
 	case PACKET_FANOUT_EBPF:
 		return fanout_set_data_ebpf(po, data, len);
 	default:
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 05/24] net: switch sock_setbindtodevice to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (3 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 06/24] net: switch sock_set_timeout " Christoph Hellwig
                   ` (22 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/core/sock.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 91224709869389..bd20fc5cce0850 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -608,8 +608,7 @@ int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
 }
 EXPORT_SYMBOL(sock_bindtoindex);
 
-static int sock_setbindtodevice(struct sock *sk, char __user *optval,
-				int optlen)
+static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
 {
 	int ret = -ENOPROTOOPT;
 #ifdef CONFIG_NETDEVICES
@@ -631,7 +630,7 @@ static int sock_setbindtodevice(struct sock *sk, char __user *optval,
 	memset(devname, 0, sizeof(devname));
 
 	ret = -EFAULT;
-	if (copy_from_user(devname, optval, optlen))
+	if (copy_from_sockptr(devname, optval, optlen))
 		goto out;
 
 	index = 0;
@@ -839,7 +838,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	 */
 
 	if (optname == SO_BINDTODEVICE)
-		return sock_setbindtodevice(sk, optval, optlen);
+		return sock_setbindtodevice(sk, USER_SOCKPTR(optval), optlen);
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 06/24] net: switch sock_set_timeout to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (4 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 05/24] net: switch sock_setbindtodevice " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 07/24] " Christoph Hellwig
                   ` (21 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/core/sock.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index bd20fc5cce0850..d45bb1c2c36abf 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -360,7 +360,8 @@ static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
 	return sizeof(tv);
 }
 
-static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
+static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
+			    bool old_timeval)
 {
 	struct __kernel_sock_timeval tv;
 
@@ -370,7 +371,7 @@ static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool
 		if (optlen < sizeof(tv32))
 			return -EINVAL;
 
-		if (copy_from_user(&tv32, optval, sizeof(tv32)))
+		if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
 			return -EFAULT;
 		tv.tv_sec = tv32.tv_sec;
 		tv.tv_usec = tv32.tv_usec;
@@ -379,14 +380,14 @@ static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool
 
 		if (optlen < sizeof(old_tv))
 			return -EINVAL;
-		if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
+		if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
 			return -EFAULT;
 		tv.tv_sec = old_tv.tv_sec;
 		tv.tv_usec = old_tv.tv_usec;
 	} else {
 		if (optlen < sizeof(tv))
 			return -EINVAL;
-		if (copy_from_user(&tv, optval, sizeof(tv)))
+		if (copy_from_sockptr(&tv, optval, sizeof(tv)))
 			return -EFAULT;
 	}
 	if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
@@ -1050,12 +1051,14 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 	case SO_RCVTIMEO_OLD:
 	case SO_RCVTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
+		ret = sock_set_timeout(&sk->sk_rcvtimeo, USER_SOCKPTR(optval),
+				       optlen, optname == SO_RCVTIMEO_OLD);
 		break;
 
 	case SO_SNDTIMEO_OLD:
 	case SO_SNDTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
+		ret = sock_set_timeout(&sk->sk_sndtimeo, USER_SOCKPTR(optval),
+				       optlen, optname == SO_SNDTIMEO_OLD);
 		break;
 
 	case SO_ATTACH_FILTER: {
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 07/24] net: switch sock_set_timeout to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (5 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 06/24] net: switch sock_set_timeout " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 08/24] net/xfrm: switch xfrm_user_policy " Christoph Hellwig
                   ` (20 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/sock.h   |  3 ++-
 net/core/sock.c      | 26 ++++++++++++--------------
 net/mptcp/protocol.c |  6 ++++--
 net/socket.c         |  3 ++-
 4 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 62e18fc8ac9f96..bfb2fe2fc36876 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -59,6 +59,7 @@
 #include <linux/filter.h>
 #include <linux/rculist_nulls.h>
 #include <linux/poll.h>
+#include <linux/sockptr.h>
 
 #include <linux/atomic.h>
 #include <linux/refcount.h>
@@ -1669,7 +1670,7 @@ void sock_pfree(struct sk_buff *skb);
 #endif
 
 int sock_setsockopt(struct socket *sock, int level, int op,
-		    char __user *optval, unsigned int optlen);
+		    sockptr_t optval, unsigned int optlen);
 
 int sock_getsockopt(struct socket *sock, int level, int op,
 		    char __user *optval, int __user *optlen);
diff --git a/net/core/sock.c b/net/core/sock.c
index d45bb1c2c36abf..9cf8318bc51de4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -825,7 +825,7 @@ EXPORT_SYMBOL(sock_set_rcvbuf);
  */
 
 int sock_setsockopt(struct socket *sock, int level, int optname,
-		    char __user *optval, unsigned int optlen)
+		    sockptr_t optval, unsigned int optlen)
 {
 	struct sock_txtime sk_txtime;
 	struct sock *sk = sock->sk;
@@ -839,12 +839,12 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	 */
 
 	if (optname == SO_BINDTODEVICE)
-		return sock_setbindtodevice(sk, USER_SOCKPTR(optval), optlen);
+		return sock_setbindtodevice(sk, optval, optlen);
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -957,7 +957,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			ret = -EINVAL;	/* 1003.1g */
 			break;
 		}
-		if (copy_from_user(&ling, optval, sizeof(ling))) {
+		if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1051,21 +1051,20 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 	case SO_RCVTIMEO_OLD:
 	case SO_RCVTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_rcvtimeo, USER_SOCKPTR(optval),
+		ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
 				       optlen, optname == SO_RCVTIMEO_OLD);
 		break;
 
 	case SO_SNDTIMEO_OLD:
 	case SO_SNDTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_sndtimeo, USER_SOCKPTR(optval),
+		ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
 				       optlen, optname == SO_SNDTIMEO_OLD);
 		break;
 
 	case SO_ATTACH_FILTER: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
-					       optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
 		if (!ret)
 			ret = sk_attach_filter(&fprog, sk);
 		break;
@@ -1076,7 +1075,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			u32 ufd;
 
 			ret = -EFAULT;
-			if (copy_from_user(&ufd, optval, sizeof(ufd)))
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
 				break;
 
 			ret = sk_attach_bpf(ufd, sk);
@@ -1086,8 +1085,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	case SO_ATTACH_REUSEPORT_CBPF: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
-					       optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
 		if (!ret)
 			ret = sk_reuseport_attach_filter(&fprog, sk);
 		break;
@@ -1098,7 +1096,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			u32 ufd;
 
 			ret = -EFAULT;
-			if (copy_from_user(&ufd, optval, sizeof(ufd)))
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
 				break;
 
 			ret = sk_reuseport_attach_bpf(ufd, sk);
@@ -1178,7 +1176,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 		if (sizeof(ulval) != sizeof(val) &&
 		    optlen >= sizeof(ulval) &&
-		    get_user(ulval, (unsigned long __user *)optval)) {
+		    copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1221,7 +1219,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(struct sock_txtime)) {
 			ret = -EINVAL;
 			break;
-		} else if (copy_from_user(&sk_txtime, optval,
+		} else if (copy_from_sockptr(&sk_txtime, optval,
 			   sizeof(struct sock_txtime))) {
 			ret = -EFAULT;
 			break;
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index f0b0b503c2628d..27b6f250b87dfd 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1643,7 +1643,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 			return -EINVAL;
 		}
 
-		ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
+		ret = sock_setsockopt(ssock, SOL_SOCKET, optname,
+				      USER_SOCKPTR(optval), optlen);
 		if (ret == 0) {
 			if (optname == SO_REUSEPORT)
 				sk->sk_reuseport = ssock->sk->sk_reuseport;
@@ -1654,7 +1655,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 		return ret;
 	}
 
-	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
+	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+			       USER_SOCKPTR(optval), optlen);
 }
 
 static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
diff --git a/net/socket.c b/net/socket.c
index 93846568c2fb7a..c97f83d879ae75 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2130,7 +2130,8 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *optval,
 	}
 
 	if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
-		err = sock_setsockopt(sock, level, optname, optval, optlen);
+		err = sock_setsockopt(sock, level, optname,
+				      USER_SOCKPTR(optval), optlen);
 	else if (unlikely(!sock->ops->setsockopt))
 		err = -EOPNOTSUPP;
 	else
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 08/24] net/xfrm: switch xfrm_user_policy to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (6 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 07/24] " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 09/24] netfilter: remove the unused user argument to do_update_counters Christoph Hellwig
                   ` (19 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/xfrm.h       | 8 +++++---
 net/ipv4/ip_sockglue.c   | 3 ++-
 net/ipv6/ipv6_sockglue.c | 3 ++-
 net/xfrm/xfrm_state.c    | 6 +++---
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index f9e1fda82ddfc0..5e81868b574a73 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -15,6 +15,7 @@
 #include <linux/audit.h>
 #include <linux/slab.h>
 #include <linux/refcount.h>
+#include <linux/sockptr.h>
 
 #include <net/sock.h>
 #include <net/dst.h>
@@ -1609,10 +1610,11 @@ int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
-int xfrm_user_policy(struct sock *sk, int optname,
-		     u8 __user *optval, int optlen);
+int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
+		     int optlen);
 #else
-static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+static inline int xfrm_user_policy(struct sock *sk, int optname,
+				   sockptr_t optval, int optlen)
 {
  	return -ENOPROTOOPT;
 }
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index a5ea02d7a183eb..da933f99b5d517 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1322,7 +1322,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		err = -EPERM;
 		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
 			break;
-		err = xfrm_user_policy(sk, optname, optval, optlen);
+		err = xfrm_user_policy(sk, optname, USER_SOCKPTR(optval),
+				       optlen);
 		break;
 
 	case IP_TRANSPARENT:
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index add8f791229945..56a74707c61741 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -935,7 +935,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		retv = -EPERM;
 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 			break;
-		retv = xfrm_user_policy(sk, optname, optval, optlen);
+		retv = xfrm_user_policy(sk, optname, USER_SOCKPTR(optval),
+					optlen);
 		break;
 
 	case IPV6_ADDR_PREFERENCES:
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 8be2d926acc21d..69520ad3d83bfb 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2264,7 +2264,7 @@ static bool km_is_alive(const struct km_event *c)
 	return is_alive;
 }
 
-int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
 {
 	int err;
 	u8 *data;
@@ -2274,7 +2274,7 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
 	if (in_compat_syscall())
 		return -EOPNOTSUPP;
 
-	if (!optval && !optlen) {
+	if (sockptr_is_null(optval) && !optlen) {
 		xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
 		xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
 		__sk_dst_reset(sk);
@@ -2284,7 +2284,7 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
 	if (optlen <= 0 || optlen > PAGE_SIZE)
 		return -EMSGSIZE;
 
-	data = memdup_user(optval, optlen);
+	data = memdup_sockptr(optval, optlen);
 	if (IS_ERR(data))
 		return PTR_ERR(data);
 
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 09/24] netfilter: remove the unused user argument to do_update_counters
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (7 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 08/24] net/xfrm: switch xfrm_user_policy " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 10/24] netfilter: switch xt_copy_counters to sockptr_t Christoph Hellwig
                   ` (18 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/bridge/netfilter/ebtables.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index fe13108af1f542..12f8929667bf43 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1242,9 +1242,8 @@ void ebt_unregister_table(struct net *net, struct ebt_table *table,
 
 /* userspace just supplied us with counters */
 static int do_update_counters(struct net *net, const char *name,
-				struct ebt_counter __user *counters,
-				unsigned int num_counters,
-				const void __user *user, unsigned int len)
+			      struct ebt_counter __user *counters,
+			      unsigned int num_counters, unsigned int len)
 {
 	int i, ret;
 	struct ebt_counter *tmp;
@@ -1299,7 +1298,7 @@ static int update_counters(struct net *net, const void __user *user,
 		return -EINVAL;
 
 	return do_update_counters(net, hlp.name, hlp.counters,
-				hlp.num_counters, user, len);
+				  hlp.num_counters, len);
 }
 
 static inline int ebt_obj_to_user(char __user *um, const char *_name,
@@ -2231,7 +2230,7 @@ static int compat_update_counters(struct net *net, void __user *user,
 		return update_counters(net, user, len);
 
 	return do_update_counters(net, hlp.name, compat_ptr(hlp.counters),
-					hlp.num_counters, user, len);
+				  hlp.num_counters, len);
 }
 
 static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 10/24] netfilter: switch xt_copy_counters to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (8 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 09/24] netfilter: remove the unused user argument to do_update_counters Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 11/24] netfilter: switch nf_setsockopt " Christoph Hellwig
                   ` (17 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/netfilter/x_tables.h |  4 ++--
 net/ipv4/netfilter/arp_tables.c    |  7 +++----
 net/ipv4/netfilter/ip_tables.c     |  7 +++----
 net/ipv6/netfilter/ip6_tables.c    |  6 +++---
 net/netfilter/x_tables.c           | 20 ++++++++++----------
 5 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index b8b943ee7b8b66..5deb099d156dcb 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -301,8 +301,8 @@ int xt_target_to_user(const struct xt_entry_target *t,
 int xt_data_to_user(void __user *dst, const void *src,
 		    int usersize, int size, int aligned_size);
 
-void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
-				 struct xt_counters_info *info);
+void *xt_copy_counters(sockptr_t arg, unsigned int len,
+		       struct xt_counters_info *info);
 struct xt_counters *xt_counters_alloc(unsigned int counters);
 
 struct xt_table *xt_register_table(struct net *net,
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 2c8a4dad39d748..6d24b686c7f00a 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -996,8 +996,7 @@ static int do_replace(struct net *net, const void __user *user,
 	return ret;
 }
 
-static int do_add_counters(struct net *net, const void __user *user,
-			   unsigned int len)
+static int do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	unsigned int i;
 	struct xt_counters_info tmp;
@@ -1008,7 +1007,7 @@ static int do_add_counters(struct net *net, const void __user *user,
 	struct arpt_entry *iter;
 	unsigned int addend;
 
-	paddc = xt_copy_counters_from_user(user, len, &tmp);
+	paddc = xt_copy_counters(arg, len, &tmp);
 	if (IS_ERR(paddc))
 		return PTR_ERR(paddc);
 
@@ -1420,7 +1419,7 @@ static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned
 		break;
 
 	case ARPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len);
+		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
 		break;
 
 	default:
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 161901dd1cae7f..4697d09c98dc3e 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1151,8 +1151,7 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 }
 
 static int
-do_add_counters(struct net *net, const void __user *user,
-		unsigned int len)
+do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	unsigned int i;
 	struct xt_counters_info tmp;
@@ -1163,7 +1162,7 @@ do_add_counters(struct net *net, const void __user *user,
 	struct ipt_entry *iter;
 	unsigned int addend;
 
-	paddc = xt_copy_counters_from_user(user, len, &tmp);
+	paddc = xt_copy_counters(arg, len, &tmp);
 	if (IS_ERR(paddc))
 		return PTR_ERR(paddc);
 
@@ -1629,7 +1628,7 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 		break;
 
 	case IPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len);
+		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
 		break;
 
 	default:
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index fd1f8f93123188..a787aba30e2db7 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1168,7 +1168,7 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 }
 
 static int
-do_add_counters(struct net *net, const void __user *user, unsigned int len)
+do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	unsigned int i;
 	struct xt_counters_info tmp;
@@ -1179,7 +1179,7 @@ do_add_counters(struct net *net, const void __user *user, unsigned int len)
 	struct ip6t_entry *iter;
 	unsigned int addend;
 
-	paddc = xt_copy_counters_from_user(user, len, &tmp);
+	paddc = xt_copy_counters(arg, len, &tmp);
 	if (IS_ERR(paddc))
 		return PTR_ERR(paddc);
 	t = xt_find_table_lock(net, AF_INET6, tmp.name);
@@ -1637,7 +1637,7 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 		break;
 
 	case IP6T_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), user, len);
+		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
 		break;
 
 	default:
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 32bab45af7e415..b97eb4b538fd4e 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1028,9 +1028,9 @@ int xt_check_target(struct xt_tgchk_param *par,
 EXPORT_SYMBOL_GPL(xt_check_target);
 
 /**
- * xt_copy_counters_from_user - copy counters and metadata from userspace
+ * xt_copy_counters - copy counters and metadata from a sockptr_t
  *
- * @user: src pointer to userspace memory
+ * @arg: src sockptr
  * @len: alleged size of userspace memory
  * @info: where to store the xt_counters_info metadata
  *
@@ -1047,8 +1047,8 @@ EXPORT_SYMBOL_GPL(xt_check_target);
  * Return: returns pointer that caller has to test via IS_ERR().
  * If IS_ERR is false, caller has to vfree the pointer.
  */
-void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
-				 struct xt_counters_info *info)
+void *xt_copy_counters(sockptr_t arg, unsigned int len,
+		       struct xt_counters_info *info)
 {
 	void *mem;
 	u64 size;
@@ -1062,12 +1062,12 @@ void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
 			return ERR_PTR(-EINVAL);
 
 		len -= sizeof(compat_tmp);
-		if (copy_from_user(&compat_tmp, user, sizeof(compat_tmp)) != 0)
+		if (copy_from_sockptr(&compat_tmp, arg, sizeof(compat_tmp)) != 0)
 			return ERR_PTR(-EFAULT);
 
 		memcpy(info->name, compat_tmp.name, sizeof(info->name) - 1);
 		info->num_counters = compat_tmp.num_counters;
-		user += sizeof(compat_tmp);
+		sockptr_advance(arg, sizeof(compat_tmp));
 	} else
 #endif
 	{
@@ -1075,10 +1075,10 @@ void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
 			return ERR_PTR(-EINVAL);
 
 		len -= sizeof(*info);
-		if (copy_from_user(info, user, sizeof(*info)) != 0)
+		if (copy_from_sockptr(info, arg, sizeof(*info)) != 0)
 			return ERR_PTR(-EFAULT);
 
-		user += sizeof(*info);
+		sockptr_advance(arg, sizeof(*info));
 	}
 	info->name[sizeof(info->name) - 1] = '\0';
 
@@ -1092,13 +1092,13 @@ void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
 	if (!mem)
 		return ERR_PTR(-ENOMEM);
 
-	if (copy_from_user(mem, user, len) == 0)
+	if (copy_from_sockptr(mem, arg, len) == 0)
 		return mem;
 
 	vfree(mem);
 	return ERR_PTR(-EFAULT);
 }
-EXPORT_SYMBOL_GPL(xt_copy_counters_from_user);
+EXPORT_SYMBOL_GPL(xt_copy_counters);
 
 #ifdef CONFIG_COMPAT
 int xt_compat_target_offset(const struct xt_target *target)
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 11/24] netfilter: switch nf_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (9 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 10/24] netfilter: switch xt_copy_counters to sockptr_t Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt " Christoph Hellwig
                   ` (16 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/netfilter.h       |  6 ++++--
 net/bridge/netfilter/ebtables.c | 37 +++++++++++++++------------------
 net/decnet/af_decnet.c          |  3 ++-
 net/ipv4/ip_sockglue.c          |  3 ++-
 net/ipv4/netfilter/arp_tables.c | 28 ++++++++++++-------------
 net/ipv4/netfilter/ip_tables.c  | 24 ++++++++++-----------
 net/ipv6/ipv6_sockglue.c        |  3 ++-
 net/ipv6/netfilter/ip6_tables.c | 24 ++++++++++-----------
 net/netfilter/ipvs/ip_vs_ctl.c  |  4 ++--
 net/netfilter/nf_sockopt.c      |  2 +-
 10 files changed, 68 insertions(+), 66 deletions(-)

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 711b4d4486f042..0101747de54936 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -13,6 +13,7 @@
 #include <linux/static_key.h>
 #include <linux/netfilter_defs.h>
 #include <linux/netdevice.h>
+#include <linux/sockptr.h>
 #include <net/net_namespace.h>
 
 static inline int NF_DROP_GETERR(int verdict)
@@ -163,7 +164,8 @@ struct nf_sockopt_ops {
 	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
 	int set_optmin;
 	int set_optmax;
-	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
+	int (*set)(struct sock *sk, int optval, sockptr_t arg,
+		   unsigned int len);
 	int get_optmin;
 	int get_optmax;
 	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
@@ -338,7 +340,7 @@ NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 }
 
 /* Call setsockopt() */
-int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
+int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
 		  unsigned int len);
 int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
 		  int *len);
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 12f8929667bf43..d35173e803d3fe 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1063,14 +1063,13 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
 }
 
 /* replace the table */
-static int do_replace(struct net *net, const void __user *user,
-		      unsigned int len)
+static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret, countersize;
 	struct ebt_table_info *newinfo;
 	struct ebt_replace tmp;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	if (len != sizeof(tmp) + tmp.entries_size)
@@ -1286,12 +1285,11 @@ static int do_update_counters(struct net *net, const char *name,
 	return ret;
 }
 
-static int update_counters(struct net *net, const void __user *user,
-			    unsigned int len)
+static int update_counters(struct net *net, sockptr_t arg, unsigned int len)
 {
 	struct ebt_replace hlp;
 
-	if (copy_from_user(&hlp, user, sizeof(hlp)))
+	if (copy_from_sockptr(&hlp, arg, sizeof(hlp)))
 		return -EFAULT;
 
 	if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
@@ -2079,7 +2077,7 @@ static int compat_copy_entries(unsigned char *data, unsigned int size_user,
 
 
 static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
-					    void __user *user, unsigned int len)
+					     sockptr_t arg, unsigned int len)
 {
 	struct compat_ebt_replace tmp;
 	int i;
@@ -2087,7 +2085,7 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
 	if (len < sizeof(tmp))
 		return -EINVAL;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)))
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)))
 		return -EFAULT;
 
 	if (len != sizeof(tmp) + tmp.entries_size)
@@ -2114,8 +2112,7 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
 	return 0;
 }
 
-static int compat_do_replace(struct net *net, void __user *user,
-			     unsigned int len)
+static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret, i, countersize, size64;
 	struct ebt_table_info *newinfo;
@@ -2123,10 +2120,10 @@ static int compat_do_replace(struct net *net, void __user *user,
 	struct ebt_entries_buf_state state;
 	void *entries_tmp;
 
-	ret = compat_copy_ebt_replace_from_user(&tmp, user, len);
+	ret = compat_copy_ebt_replace_from_user(&tmp, arg, len);
 	if (ret) {
 		/* try real handler in case userland supplied needed padding */
-		if (ret == -EINVAL && do_replace(net, user, len) == 0)
+		if (ret == -EINVAL && do_replace(net, arg, len) == 0)
 			ret = 0;
 		return ret;
 	}
@@ -2217,17 +2214,17 @@ static int compat_do_replace(struct net *net, void __user *user,
 	goto free_entries;
 }
 
-static int compat_update_counters(struct net *net, void __user *user,
+static int compat_update_counters(struct net *net, sockptr_t arg,
 				  unsigned int len)
 {
 	struct compat_ebt_replace hlp;
 
-	if (copy_from_user(&hlp, user, sizeof(hlp)))
+	if (copy_from_sockptr(&hlp, arg, sizeof(hlp)))
 		return -EFAULT;
 
 	/* try real handler in case userland supplied needed padding */
 	if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
-		return update_counters(net, user, len);
+		return update_counters(net, arg, len);
 
 	return do_update_counters(net, hlp.name, compat_ptr(hlp.counters),
 				  hlp.num_counters, len);
@@ -2368,7 +2365,7 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 	return ret;
 }
 
-static int do_ebt_set_ctl(struct sock *sk, int cmd, void __user *user,
+static int do_ebt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,
 		unsigned int len)
 {
 	struct net *net = sock_net(sk);
@@ -2381,18 +2378,18 @@ static int do_ebt_set_ctl(struct sock *sk, int cmd, void __user *user,
 	case EBT_SO_SET_ENTRIES:
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
-			ret = compat_do_replace(net, user, len);
+			ret = compat_do_replace(net, arg, len);
 		else
 #endif
-			ret = do_replace(net, user, len);
+			ret = do_replace(net, arg, len);
 		break;
 	case EBT_SO_SET_COUNTERS:
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
-			ret = compat_update_counters(net, user, len);
+			ret = compat_update_counters(net, arg, len);
 		else
 #endif
-			ret = update_counters(net, user, len);
+			ret = update_counters(net, arg, len);
 		break;
 	default:
 		ret = -EINVAL;
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 7d7ae2dd69b8ad..7d51ab608fb3f1 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -1332,7 +1332,8 @@ static int dn_setsockopt(struct socket *sock, int level, int optname, char __use
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
 	    optname != DSO_STREAM && optname != DSO_SEQPACKET)
-		err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
+		err = nf_setsockopt(sk, PF_DECnet, optname,
+				    USER_SOCKPTR(optval), optlen);
 #endif
 
 	return err;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index da933f99b5d517..42befbf12846c0 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1422,7 +1422,8 @@ int ip_setsockopt(struct sock *sk, int level,
 			optname != IP_IPSEC_POLICY &&
 			optname != IP_XFRM_POLICY &&
 			!ip_mroute_opt(optname))
-		err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
+		err = nf_setsockopt(sk, PF_INET, optname, USER_SOCKPTR(optval),
+				    optlen);
 #endif
 	return err;
 }
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 6d24b686c7f00a..f5b26ef1782001 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0-only
+
 /*
  * Packet matching code for ARP packets.
  *
@@ -947,8 +947,7 @@ static int __do_replace(struct net *net, const char *name,
 	return ret;
 }
 
-static int do_replace(struct net *net, const void __user *user,
-		      unsigned int len)
+static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct arpt_replace tmp;
@@ -956,7 +955,7 @@ static int do_replace(struct net *net, const void __user *user,
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -972,8 +971,8 @@ static int do_replace(struct net *net, const void __user *user,
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1244,8 +1243,7 @@ static int translate_compat_table(struct net *net,
 	return ret;
 }
 
-static int compat_do_replace(struct net *net, void __user *user,
-			     unsigned int len)
+static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct compat_arpt_replace tmp;
@@ -1253,7 +1251,7 @@ static int compat_do_replace(struct net *net, void __user *user,
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1269,7 +1267,8 @@ static int compat_do_replace(struct net *net, void __user *user,
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1401,7 +1400,8 @@ static int compat_get_entries(struct net *net,
 }
 #endif
 
-static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+static int do_arpt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,
+		unsigned int len)
 {
 	int ret;
 
@@ -1412,14 +1412,14 @@ static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned
 	case ARPT_SO_SET_REPLACE:
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
-			ret = compat_do_replace(sock_net(sk), user, len);
+			ret = compat_do_replace(sock_net(sk), arg, len);
 		else
 #endif
-			ret = do_replace(sock_net(sk), user, len);
+			ret = do_replace(sock_net(sk), arg, len);
 		break;
 
 	case ARPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
+		ret = do_add_counters(sock_net(sk), arg, len);
 		break;
 
 	default:
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 4697d09c98dc3e..f2a9680303d8c0 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1102,7 +1102,7 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
 }
 
 static int
-do_replace(struct net *net, const void __user *user, unsigned int len)
+do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct ipt_replace tmp;
@@ -1110,7 +1110,7 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1126,8 +1126,8 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1484,7 +1484,7 @@ translate_compat_table(struct net *net,
 }
 
 static int
-compat_do_replace(struct net *net, void __user *user, unsigned int len)
+compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct compat_ipt_replace tmp;
@@ -1492,7 +1492,7 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1508,8 +1508,8 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1610,7 +1610,7 @@ compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
 #endif
 
 static int
-do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+do_ipt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len)
 {
 	int ret;
 
@@ -1621,14 +1621,14 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 	case IPT_SO_SET_REPLACE:
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
-			ret = compat_do_replace(sock_net(sk), user, len);
+			ret = compat_do_replace(sock_net(sk), arg, len);
 		else
 #endif
-			ret = do_replace(sock_net(sk), user, len);
+			ret = do_replace(sock_net(sk), arg, len);
 		break;
 
 	case IPT_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
+		ret = do_add_counters(sock_net(sk), arg, len);
 		break;
 
 	default:
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 56a74707c61741..85892b35cff7b3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -996,7 +996,8 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 			optname != IPV6_XFRM_POLICY)
-		err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
+		err = nf_setsockopt(sk, PF_INET6, optname, USER_SOCKPTR(optval),
+				    optlen);
 #endif
 	return err;
 }
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index a787aba30e2db7..1d52957a413f4a 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1119,7 +1119,7 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
 }
 
 static int
-do_replace(struct net *net, const void __user *user, unsigned int len)
+do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct ip6t_replace tmp;
@@ -1127,7 +1127,7 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 	void *loc_cpu_entry;
 	struct ip6t_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1143,8 +1143,8 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1493,7 +1493,7 @@ translate_compat_table(struct net *net,
 }
 
 static int
-compat_do_replace(struct net *net, void __user *user, unsigned int len)
+compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 {
 	int ret;
 	struct compat_ip6t_replace tmp;
@@ -1501,7 +1501,7 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
 	void *loc_cpu_entry;
 	struct ip6t_entry *iter;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1517,8 +1517,8 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
 		return -ENOMEM;
 
 	loc_cpu_entry = newinfo->entries;
-	if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
-			   tmp.size) != 0) {
+	sockptr_advance(arg, sizeof(tmp));
+	if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
 		ret = -EFAULT;
 		goto free_newinfo;
 	}
@@ -1619,7 +1619,7 @@ compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
 #endif
 
 static int
-do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+do_ip6t_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len)
 {
 	int ret;
 
@@ -1630,14 +1630,14 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 	case IP6T_SO_SET_REPLACE:
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
-			ret = compat_do_replace(sock_net(sk), user, len);
+			ret = compat_do_replace(sock_net(sk), arg, len);
 		else
 #endif
-			ret = do_replace(sock_net(sk), user, len);
+			ret = do_replace(sock_net(sk), arg, len);
 		break;
 
 	case IP6T_SO_SET_ADD_COUNTERS:
-		ret = do_add_counters(sock_net(sk), USER_SOCKPTR(user), len);
+		ret = do_add_counters(sock_net(sk), arg, len);
 		break;
 
 	default:
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 4af83f466dfc2c..bcac316addabe8 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2434,7 +2434,7 @@ static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
 }
 
 static int
-do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+do_ip_vs_set_ctl(struct sock *sk, int cmd, sockptr_t ptr, unsigned int len)
 {
 	struct net *net = sock_net(sk);
 	int ret;
@@ -2458,7 +2458,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 		return -EINVAL;
 	}
 
-	if (copy_from_user(arg, user, len) != 0)
+	if (copy_from_sockptr(arg, ptr, len) != 0)
 		return -EFAULT;
 
 	/* Handle daemons since they have another lock */
diff --git a/net/netfilter/nf_sockopt.c b/net/netfilter/nf_sockopt.c
index 90469b1f628a8e..34afcd03b6f60e 100644
--- a/net/netfilter/nf_sockopt.c
+++ b/net/netfilter/nf_sockopt.c
@@ -89,7 +89,7 @@ static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, u_int8_t pf,
 	return ops;
 }
 
-int nf_setsockopt(struct sock *sk, u_int8_t pf, int val, char __user *opt,
+int nf_setsockopt(struct sock *sk, u_int8_t pf, int val, sockptr_t opt,
 		  unsigned int len)
 {
 	struct nf_sockopt_ops *ops;
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (10 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 11/24] netfilter: switch nf_setsockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-21  8:36   ` David Laight
  2020-07-20 12:47 ` [PATCH 13/24] net/ipv4: switch ip_mroute_setsockopt " Christoph Hellwig
                   ` (15 subsequent siblings)
  27 siblings, 1 reply; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

This is mostly to prepare for cleaning up the callers, as bpfilter by
design can't handle kernel pointers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/bpfilter.h     | 6 +++---
 net/bpfilter/bpfilter_kern.c | 8 ++++----
 net/ipv4/bpfilter/sockopt.c  | 8 ++++----
 net/ipv4/ip_sockglue.c       | 3 ++-
 4 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/include/linux/bpfilter.h b/include/linux/bpfilter.h
index 9b114c718a7617..2ae3c8e1d83c43 100644
--- a/include/linux/bpfilter.h
+++ b/include/linux/bpfilter.h
@@ -4,9 +4,10 @@
 
 #include <uapi/linux/bpfilter.h>
 #include <linux/usermode_driver.h>
+#include <linux/sockptr.h>
 
 struct sock;
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
 			    unsigned int optlen);
 int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
 			    int __user *optlen);
@@ -16,8 +17,7 @@ struct bpfilter_umh_ops {
 	struct umd_info info;
 	/* since ip_getsockopt() can run in parallel, serialize access to umh */
 	struct mutex lock;
-	int (*sockopt)(struct sock *sk, int optname,
-		       char __user *optval,
+	int (*sockopt)(struct sock *sk, int optname, sockptr_t optval,
 		       unsigned int optlen, bool is_set);
 	int (*start)(void);
 };
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 713b4b3d02005d..52f8d0bc3f6b29 100644
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -32,7 +32,7 @@ static void __stop_umh(void)
 }
 
 static int __bpfilter_process_sockopt(struct sock *sk, int optname,
-				      char __user *optval,
+				      sockptr_t optval,
 				      unsigned int optlen, bool is_set)
 {
 	struct mbox_request req;
@@ -41,7 +41,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
 	ssize_t n;
 	int ret = -EFAULT;
 
-	if (uaccess_kernel()) {
+	if (uaccess_kernel() || sockptr_is_kernel(optval)) {
 		pr_err("kernel access not supported\n");
 		return -EFAULT;
 	}
@@ -49,7 +49,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
 	req.is_set = is_set;
 	req.pid = current->pid;
 	req.cmd = optname;
-	req.addr = (__force long)optval;
+	req.addr = (__force long)optval.user;
 	req.len = optlen;
 	if (!bpfilter_ops.info.tgid)
 		goto out;
@@ -87,7 +87,7 @@ static int start_umh(void)
 	pr_info("Loaded bpfilter_umh pid %d\n", pid_nr(bpfilter_ops.info.tgid));
 
 	/* health check that usermode process started correctly */
-	if (__bpfilter_process_sockopt(NULL, 0, NULL, 0, 0) != 0) {
+	if (__bpfilter_process_sockopt(NULL, 0, USER_SOCKPTR(NULL), 0, 0)) {
 		shutdown_umh();
 		return -EFAULT;
 	}
diff --git a/net/ipv4/bpfilter/sockopt.c b/net/ipv4/bpfilter/sockopt.c
index 9063c6767d3410..1b34cb9a7708ec 100644
--- a/net/ipv4/bpfilter/sockopt.c
+++ b/net/ipv4/bpfilter/sockopt.c
@@ -21,8 +21,7 @@ void bpfilter_umh_cleanup(struct umd_info *info)
 }
 EXPORT_SYMBOL_GPL(bpfilter_umh_cleanup);
 
-static int bpfilter_mbox_request(struct sock *sk, int optname,
-				 char __user *optval,
+static int bpfilter_mbox_request(struct sock *sk, int optname, sockptr_t optval,
 				 unsigned int optlen, bool is_set)
 {
 	int err;
@@ -52,7 +51,7 @@ static int bpfilter_mbox_request(struct sock *sk, int optname,
 	return err;
 }
 
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
 			    unsigned int optlen)
 {
 	return bpfilter_mbox_request(sk, optname, optval, optlen, true);
@@ -66,7 +65,8 @@ int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	return bpfilter_mbox_request(sk, optname, optval, len, false);
+	return bpfilter_mbox_request(sk, optname, USER_SOCKPTR(optval), len,
+				     false);
 }
 
 static int __init bpfilter_sockopt_init(void)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 42befbf12846c0..36f746e01741f6 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1414,7 +1414,8 @@ int ip_setsockopt(struct sock *sk, int level,
 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
 	if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
 	    optname < BPFILTER_IPT_SET_MAX)
-		err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
+		err = bpfilter_ip_set_sockopt(sk, optname, USER_SOCKPTR(optval),
+					      optlen);
 #endif
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 13/24] net/ipv4: switch ip_mroute_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (11 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 14/24] net/ipv4: merge ip_options_get and ip_options_get_from_user Christoph Hellwig
                   ` (14 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/mroute.h |  5 +++--
 net/ipv4/ip_sockglue.c |  3 ++-
 net/ipv4/ipmr.c        | 14 +++++++-------
 3 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index 9a36fad9e068f6..6cbbfe94348cee 100644
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -8,6 +8,7 @@
 #include <net/fib_notifier.h>
 #include <uapi/linux/mroute.h>
 #include <linux/mroute_base.h>
+#include <linux/sockptr.h>
 
 #ifdef CONFIG_IP_MROUTE
 static inline int ip_mroute_opt(int opt)
@@ -15,7 +16,7 @@ static inline int ip_mroute_opt(int opt)
 	return opt >= MRT_BASE && opt <= MRT_MAX;
 }
 
-int ip_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
+int ip_mroute_setsockopt(struct sock *, int, sockptr_t, unsigned int);
 int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg);
 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
@@ -23,7 +24,7 @@ int ip_mr_init(void);
 bool ipmr_rule_default(const struct fib_rule *rule);
 #else
 static inline int ip_mroute_setsockopt(struct sock *sock, int optname,
-				       char __user *optval, unsigned int optlen)
+				       sockptr_t optval, unsigned int optlen)
 {
 	return -ENOPROTOOPT;
 }
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 36f746e01741f6..ac495b0cff8ffb 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -925,7 +925,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 	if (optname == IP_ROUTER_ALERT)
 		return ip_ra_control(sk, val ? 1 : 0, NULL);
 	if (ip_mroute_opt(optname))
-		return ip_mroute_setsockopt(sk, optname, optval, optlen);
+		return ip_mroute_setsockopt(sk, optname, USER_SOCKPTR(optval),
+					    optlen);
 
 	err = 0;
 	if (needs_rtnl)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 678639c01e4882..cdf3a40f9ff5fc 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1341,7 +1341,7 @@ static void mrtsock_destruct(struct sock *sk)
  * MOSPF/PIM router set up we can clean this up.
  */
 
-int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
+int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 			 unsigned int optlen)
 {
 	struct net *net = sock_net(sk);
@@ -1413,7 +1413,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (copy_from_user(&vif, optval, sizeof(vif))) {
+		if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1441,7 +1441,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (copy_from_user(&mfc, optval, sizeof(mfc))) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1459,7 +1459,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1471,7 +1471,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1486,7 +1486,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(val, (int __user *)optval)) {
+		if (copy_from_sockptr(&val, optval, sizeof(val))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1508,7 +1508,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
 			ret = -EINVAL;
 			break;
 		}
-		if (get_user(uval, (u32 __user *)optval)) {
+		if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
 			ret = -EFAULT;
 			break;
 		}
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 14/24] net/ipv4: merge ip_options_get and ip_options_get_from_user
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (12 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 13/24] net/ipv4: switch ip_mroute_setsockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 15/24] net/ipv4: switch do_ip_setsockopt to sockptr_t Christoph Hellwig
                   ` (13 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Use the sockptr_t type to merge the versions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/ip.h       |  5 ++---
 net/ipv4/ip_options.c  | 43 +++++++++++-------------------------------
 net/ipv4/ip_sockglue.c |  7 ++++---
 3 files changed, 17 insertions(+), 38 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index 3d34acc95ca825..d66ad3a9522081 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -23,6 +23,7 @@
 #include <linux/in.h>
 #include <linux/skbuff.h>
 #include <linux/jhash.h>
+#include <linux/sockptr.h>
 
 #include <net/inet_sock.h>
 #include <net/route.h>
@@ -707,9 +708,7 @@ int __ip_options_compile(struct net *net, struct ip_options *opt,
 int ip_options_compile(struct net *net, struct ip_options *opt,
 		       struct sk_buff *skb);
 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
-		   unsigned char *data, int optlen);
-int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
-			     unsigned char __user *data, int optlen);
+		   sockptr_t data, int optlen);
 void ip_options_undo(struct ip_options *opt);
 void ip_forward_options(struct sk_buff *skb);
 int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index ddaa01ec2bce82..948747aac4e2d0 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -519,15 +519,20 @@ void ip_options_undo(struct ip_options *opt)
 	}
 }
 
-static struct ip_options_rcu *ip_options_get_alloc(const int optlen)
+int ip_options_get(struct net *net, struct ip_options_rcu **optp,
+		   sockptr_t data, int optlen)
 {
-	return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
+	struct ip_options_rcu *opt;
+
+	opt = kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
 		       GFP_KERNEL);
-}
+	if (!opt)
+		return -ENOMEM;
+	if (optlen && copy_from_sockptr(opt->opt.__data, data, optlen)) {
+		kfree(opt);
+		return -EFAULT;
+	}
 
-static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp,
-				 struct ip_options_rcu *opt, int optlen)
-{
 	while (optlen & 3)
 		opt->opt.__data[optlen++] = IPOPT_END;
 	opt->opt.optlen = optlen;
@@ -540,32 +545,6 @@ static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp,
 	return 0;
 }
 
-int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
-			     unsigned char __user *data, int optlen)
-{
-	struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
-
-	if (!opt)
-		return -ENOMEM;
-	if (optlen && copy_from_user(opt->opt.__data, data, optlen)) {
-		kfree(opt);
-		return -EFAULT;
-	}
-	return ip_options_get_finish(net, optp, opt, optlen);
-}
-
-int ip_options_get(struct net *net, struct ip_options_rcu **optp,
-		   unsigned char *data, int optlen)
-{
-	struct ip_options_rcu *opt = ip_options_get_alloc(optlen);
-
-	if (!opt)
-		return -ENOMEM;
-	if (optlen)
-		memcpy(opt->opt.__data, data, optlen);
-	return ip_options_get_finish(net, optp, opt, optlen);
-}
-
 void ip_forward_options(struct sk_buff *skb)
 {
 	struct   ip_options *opt	= &(IPCB(skb)->opt);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index ac495b0cff8ffb..b12f39b52008a3 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -280,7 +280,8 @@ int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
 			err = cmsg->cmsg_len - sizeof(struct cmsghdr);
 
 			/* Our caller is responsible for freeing ipc->opt */
-			err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
+			err = ip_options_get(net, &ipc->opt,
+					     KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
 					     err < 40 ? err : 40);
 			if (err)
 				return err;
@@ -940,8 +941,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 
 		if (optlen > 40)
 			goto e_inval;
-		err = ip_options_get_from_user(sock_net(sk), &opt,
-					       optval, optlen);
+		err = ip_options_get(sock_net(sk), &opt, USER_SOCKPTR(optval),
+					      optlen);
 		if (err)
 			break;
 		old = rcu_dereference_protected(inet->inet_opt,
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 15/24] net/ipv4: switch do_ip_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (13 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 14/24] net/ipv4: merge ip_options_get and ip_options_get_from_user Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 16/24] net/ipv6: switch ip6_mroute_setsockopt " Christoph Hellwig
                   ` (12 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv4/ip_sockglue.c | 68 ++++++++++++++++++++----------------------
 1 file changed, 33 insertions(+), 35 deletions(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b12f39b52008a3..f7f1507b89fe24 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -683,15 +683,15 @@ static int set_mcast_msfilter(struct sock *sk, int ifindex,
 	return -EADDRNOTAVAIL;
 }
 
-static int copy_group_source_from_user(struct group_source_req *greqs,
-		void __user *optval, int optlen)
+static int copy_group_source_from_sockptr(struct group_source_req *greqs,
+		sockptr_t optval, int optlen)
 {
 	if (in_compat_syscall()) {
 		struct compat_group_source_req gr32;
 
 		if (optlen != sizeof(gr32))
 			return -EINVAL;
-		if (copy_from_user(&gr32, optval, sizeof(gr32)))
+		if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
 			return -EFAULT;
 		greqs->gsr_interface = gr32.gsr_interface;
 		greqs->gsr_group = gr32.gsr_group;
@@ -699,7 +699,7 @@ static int copy_group_source_from_user(struct group_source_req *greqs,
 	} else {
 		if (optlen != sizeof(*greqs))
 			return -EINVAL;
-		if (copy_from_user(greqs, optval, sizeof(*greqs)))
+		if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
 			return -EFAULT;
 	}
 
@@ -707,14 +707,14 @@ static int copy_group_source_from_user(struct group_source_req *greqs,
 }
 
 static int do_mcast_group_source(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct group_source_req greqs;
 	struct ip_mreq_source mreqs;
 	struct sockaddr_in *psin;
 	int omode, add, err;
 
-	err = copy_group_source_from_user(&greqs, optval, optlen);
+	err = copy_group_source_from_sockptr(&greqs, optval, optlen);
 	if (err)
 		return err;
 
@@ -754,8 +754,7 @@ static int do_mcast_group_source(struct sock *sk, int optname,
 	return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface);
 }
 
-static int ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
-		int optlen)
+static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen)
 {
 	struct group_filter *gsf = NULL;
 	int err;
@@ -765,7 +764,7 @@ static int ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
 	if (optlen > sysctl_optmem_max)
 		return -ENOBUFS;
 
-	gsf = memdup_user(optval, optlen);
+	gsf = memdup_sockptr(optval, optlen);
 	if (IS_ERR(gsf))
 		return PTR_ERR(gsf);
 
@@ -786,7 +785,7 @@ static int ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
 	return err;
 }
 
-static int compat_ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
+static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
 		int optlen)
 {
 	const int size0 = offsetof(struct compat_group_filter, gf_slist);
@@ -806,7 +805,7 @@ static int compat_ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
 	gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
 
 	err = -EFAULT;
-	if (copy_from_user(gf32, optval, optlen))
+	if (copy_from_sockptr(gf32, optval, optlen))
 		goto out_free_gsf;
 
 	/* numsrc >= (4G-140)/128 overflow in 32 bits */
@@ -831,7 +830,7 @@ static int compat_ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
 }
 
 static int ip_mcast_join_leave(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct ip_mreqn mreq = { };
 	struct sockaddr_in *psin;
@@ -839,7 +838,7 @@ static int ip_mcast_join_leave(struct sock *sk, int optname,
 
 	if (optlen < sizeof(struct group_req))
 		return -EINVAL;
-	if (copy_from_user(&greq, optval, sizeof(greq)))
+	if (copy_from_sockptr(&greq, optval, sizeof(greq)))
 		return -EFAULT;
 
 	psin = (struct sockaddr_in *)&greq.gr_group;
@@ -853,7 +852,7 @@ static int ip_mcast_join_leave(struct sock *sk, int optname,
 }
 
 static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct compat_group_req greq;
 	struct ip_mreqn mreq = { };
@@ -861,7 +860,7 @@ static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
 
 	if (optlen < sizeof(struct compat_group_req))
 		return -EINVAL;
-	if (copy_from_user(&greq, optval, sizeof(greq)))
+	if (copy_from_sockptr(&greq, optval, sizeof(greq)))
 		return -EFAULT;
 
 	psin = (struct sockaddr_in *)&greq.gr_group;
@@ -875,8 +874,8 @@ static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
 	return ip_mc_leave_group(sk, &mreq);
 }
 
-static int do_ip_setsockopt(struct sock *sk, int level,
-			    int optname, char __user *optval, unsigned int optlen)
+static int do_ip_setsockopt(struct sock *sk, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct net *net = sock_net(sk);
@@ -910,12 +909,12 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 	case IP_RECVFRAGSIZE:
 	case IP_RECVERR_RFC4884:
 		if (optlen >= sizeof(int)) {
-			if (get_user(val, (int __user *) optval))
+			if (copy_from_sockptr(&val, optval, sizeof(val)))
 				return -EFAULT;
 		} else if (optlen >= sizeof(char)) {
 			unsigned char ucval;
 
-			if (get_user(ucval, (unsigned char __user *) optval))
+			if (copy_from_sockptr(&ucval, optval, sizeof(ucval)))
 				return -EFAULT;
 			val = (int) ucval;
 		}
@@ -926,8 +925,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 	if (optname == IP_ROUTER_ALERT)
 		return ip_ra_control(sk, val ? 1 : 0, NULL);
 	if (ip_mroute_opt(optname))
-		return ip_mroute_setsockopt(sk, optname, USER_SOCKPTR(optval),
-					    optlen);
+		return ip_mroute_setsockopt(sk, optname, optval, optlen);
 
 	err = 0;
 	if (needs_rtnl)
@@ -941,8 +939,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 
 		if (optlen > 40)
 			goto e_inval;
-		err = ip_options_get(sock_net(sk), &opt, USER_SOCKPTR(optval),
-					      optlen);
+		err = ip_options_get(sock_net(sk), &opt, optval, optlen);
 		if (err)
 			break;
 		old = rcu_dereference_protected(inet->inet_opt,
@@ -1140,17 +1137,17 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 
 		err = -EFAULT;
 		if (optlen >= sizeof(struct ip_mreqn)) {
-			if (copy_from_user(&mreq, optval, sizeof(mreq)))
+			if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
 				break;
 		} else {
 			memset(&mreq, 0, sizeof(mreq));
 			if (optlen >= sizeof(struct ip_mreq)) {
-				if (copy_from_user(&mreq, optval,
-						   sizeof(struct ip_mreq)))
+				if (copy_from_sockptr(&mreq, optval,
+						      sizeof(struct ip_mreq)))
 					break;
 			} else if (optlen >= sizeof(struct in_addr)) {
-				if (copy_from_user(&mreq.imr_address, optval,
-						   sizeof(struct in_addr)))
+				if (copy_from_sockptr(&mreq.imr_address, optval,
+						      sizeof(struct in_addr)))
 					break;
 			}
 		}
@@ -1202,11 +1199,12 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			goto e_inval;
 		err = -EFAULT;
 		if (optlen >= sizeof(struct ip_mreqn)) {
-			if (copy_from_user(&mreq, optval, sizeof(mreq)))
+			if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
 				break;
 		} else {
 			memset(&mreq, 0, sizeof(mreq));
-			if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
+			if (copy_from_sockptr(&mreq, optval,
+					      sizeof(struct ip_mreq)))
 				break;
 		}
 
@@ -1226,7 +1224,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			err = -ENOBUFS;
 			break;
 		}
-		msf = memdup_user(optval, optlen);
+		msf = memdup_sockptr(optval, optlen);
 		if (IS_ERR(msf)) {
 			err = PTR_ERR(msf);
 			break;
@@ -1257,7 +1255,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 
 		if (optlen != sizeof(struct ip_mreq_source))
 			goto e_inval;
-		if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
+		if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1324,8 +1322,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		err = -EPERM;
 		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
 			break;
-		err = xfrm_user_policy(sk, optname, USER_SOCKPTR(optval),
-				       optlen);
+		err = xfrm_user_policy(sk, optname, optval, optlen);
 		break;
 
 	case IP_TRANSPARENT:
@@ -1412,7 +1409,8 @@ int ip_setsockopt(struct sock *sk, int level,
 	if (level != SOL_IP)
 		return -ENOPROTOOPT;
 
-	err = do_ip_setsockopt(sk, level, optname, optval, optlen);
+	err = do_ip_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
+			       optlen);
 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
 	if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
 	    optname < BPFILTER_IPT_SET_MAX)
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 16/24] net/ipv6: switch ip6_mroute_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (14 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 15/24] net/ipv4: switch do_ip_setsockopt to sockptr_t Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt Christoph Hellwig
                   ` (11 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/mroute6.h  |  8 ++++----
 net/ipv6/ip6mr.c         | 17 +++++++++--------
 net/ipv6/ipv6_sockglue.c |  3 ++-
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
index c4a45859f586d4..bc351a85ce9b9c 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -8,6 +8,7 @@
 #include <net/net_namespace.h>
 #include <uapi/linux/mroute6.h>
 #include <linux/mroute_base.h>
+#include <linux/sockptr.h>
 #include <net/fib_rules.h>
 
 #ifdef CONFIG_IPV6_MROUTE
@@ -25,7 +26,7 @@ static inline int ip6_mroute_opt(int opt)
 struct sock;
 
 #ifdef CONFIG_IPV6_MROUTE
-extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
+extern int ip6_mroute_setsockopt(struct sock *, int, sockptr_t, unsigned int);
 extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
 extern int ip6_mr_input(struct sk_buff *skb);
 extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
@@ -33,9 +34,8 @@ extern int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *ar
 extern int ip6_mr_init(void);
 extern void ip6_mr_cleanup(void);
 #else
-static inline
-int ip6_mroute_setsockopt(struct sock *sock,
-			  int optname, char __user *optval, unsigned int optlen)
+static inline int ip6_mroute_setsockopt(struct sock *sock, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	return -ENOPROTOOPT;
 }
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 1f4d20e97c07f9..06b0d2c329b94b 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1629,7 +1629,8 @@ EXPORT_SYMBOL(mroute6_is_socket);
  *	MOSPF/PIM router set up we can clean this up.
  */
 
-int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
+int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
+			  unsigned int optlen)
 {
 	int ret, parent = 0;
 	struct mif6ctl vif;
@@ -1665,7 +1666,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 	case MRT6_ADD_MIF:
 		if (optlen < sizeof(vif))
 			return -EINVAL;
-		if (copy_from_user(&vif, optval, sizeof(vif)))
+		if (copy_from_sockptr(&vif, optval, sizeof(vif)))
 			return -EFAULT;
 		if (vif.mif6c_mifi >= MAXMIFS)
 			return -ENFILE;
@@ -1678,7 +1679,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 	case MRT6_DEL_MIF:
 		if (optlen < sizeof(mifi_t))
 			return -EINVAL;
-		if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
+		if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
 			return -EFAULT;
 		rtnl_lock();
 		ret = mif6_delete(mrt, mifi, 0, NULL);
@@ -1697,7 +1698,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 	case MRT6_DEL_MFC_PROXY:
 		if (optlen < sizeof(mfc))
 			return -EINVAL;
-		if (copy_from_user(&mfc, optval, sizeof(mfc)))
+		if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
 			return -EFAULT;
 		if (parent == 0)
 			parent = mfc.mf6cc_parent;
@@ -1718,7 +1719,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 
 		if (optlen != sizeof(flags))
 			return -EINVAL;
-		if (get_user(flags, (int __user *)optval))
+		if (copy_from_sockptr(&flags, optval, sizeof(flags)))
 			return -EFAULT;
 		rtnl_lock();
 		mroute_clean_tables(mrt, flags);
@@ -1735,7 +1736,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 
 		if (optlen != sizeof(v))
 			return -EINVAL;
-		if (get_user(v, (int __user *)optval))
+		if (copy_from_sockptr(&v, optval, sizeof(v)))
 			return -EFAULT;
 		mrt->mroute_do_assert = v;
 		return 0;
@@ -1748,7 +1749,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 
 		if (optlen != sizeof(v))
 			return -EINVAL;
-		if (get_user(v, (int __user *)optval))
+		if (copy_from_sockptr(&v, optval, sizeof(v)))
 			return -EFAULT;
 		v = !!v;
 		rtnl_lock();
@@ -1769,7 +1770,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 
 		if (optlen != sizeof(u32))
 			return -EINVAL;
-		if (get_user(v, (u32 __user *)optval))
+		if (copy_from_sockptr(&v, optval, sizeof(v)))
 			return -EFAULT;
 		/* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
 		if (v != RT_TABLE_DEFAULT && v >= 100000000)
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 85892b35cff7b3..119dfaf5f4bb26 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -337,7 +337,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	valbool = (val != 0);
 
 	if (ip6_mroute_opt(optname))
-		return ip6_mroute_setsockopt(sk, optname, optval, optlen);
+		return ip6_mroute_setsockopt(sk, optname, USER_SOCKPTR(optval),
+					     optlen);
 
 	if (needs_rtnl)
 		rtnl_lock();
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (15 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 16/24] net/ipv6: switch ip6_mroute_setsockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t Christoph Hellwig
                   ` (10 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Split ipv6_flowlabel_opt into a subfunction for each action and a small
wrapper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv6/ip6_flowlabel.c | 311 +++++++++++++++++++++------------------
 1 file changed, 167 insertions(+), 144 deletions(-)

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index ce4fbba4acce7e..27ee6de9beffc4 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -533,187 +533,210 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
 	return -ENOENT;
 }
 
-int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
+#define socklist_dereference(__sflp) \
+	rcu_dereference_protected(__sflp, lockdep_is_held(&ip6_sk_fl_lock))
+
+static int ipv6_flowlabel_put(struct sock *sk, struct in6_flowlabel_req *freq)
 {
-	int uninitialized_var(err);
-	struct net *net = sock_net(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);
-	struct in6_flowlabel_req freq;
-	struct ipv6_fl_socklist *sfl1 = NULL;
-	struct ipv6_fl_socklist *sfl;
 	struct ipv6_fl_socklist __rcu **sflp;
-	struct ip6_flowlabel *fl, *fl1 = NULL;
-
+	struct ipv6_fl_socklist *sfl;
 
-	if (optlen < sizeof(freq))
-		return -EINVAL;
+	if (freq->flr_flags & IPV6_FL_F_REFLECT) {
+		if (sk->sk_protocol != IPPROTO_TCP)
+			return -ENOPROTOOPT;
+		if (!np->repflow)
+			return -ESRCH;
+		np->flow_label = 0;
+		np->repflow = 0;
+		return 0;
+	}
 
-	if (copy_from_user(&freq, optval, sizeof(freq)))
-		return -EFAULT;
+	spin_lock_bh(&ip6_sk_fl_lock);
+	for (sflp = &np->ipv6_fl_list;
+	     (sfl = socklist_dereference(*sflp)) != NULL;
+	     sflp = &sfl->next) {
+		if (sfl->fl->label == freq->flr_label)
+			goto found;
+	}
+	spin_unlock_bh(&ip6_sk_fl_lock);
+	return -ESRCH;
+found:
+	if (freq->flr_label == (np->flow_label & IPV6_FLOWLABEL_MASK))
+		np->flow_label &= ~IPV6_FLOWLABEL_MASK;
+	*sflp = sfl->next;
+	spin_unlock_bh(&ip6_sk_fl_lock);
+	fl_release(sfl->fl);
+	kfree_rcu(sfl, rcu);
+	return 0;
+}
+		
+static int ipv6_flowlabel_renew(struct sock *sk, struct in6_flowlabel_req *freq)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct net *net = sock_net(sk);
+	struct ipv6_fl_socklist *sfl;
+	int err;
 
-	switch (freq.flr_action) {
-	case IPV6_FL_A_PUT:
-		if (freq.flr_flags & IPV6_FL_F_REFLECT) {
-			if (sk->sk_protocol != IPPROTO_TCP)
-				return -ENOPROTOOPT;
-			if (!np->repflow)
-				return -ESRCH;
-			np->flow_label = 0;
-			np->repflow = 0;
-			return 0;
-		}
-		spin_lock_bh(&ip6_sk_fl_lock);
-		for (sflp = &np->ipv6_fl_list;
-		     (sfl = rcu_dereference_protected(*sflp,
-						      lockdep_is_held(&ip6_sk_fl_lock))) != NULL;
-		     sflp = &sfl->next) {
-			if (sfl->fl->label == freq.flr_label) {
-				if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
-					np->flow_label &= ~IPV6_FLOWLABEL_MASK;
-				*sflp = sfl->next;
-				spin_unlock_bh(&ip6_sk_fl_lock);
-				fl_release(sfl->fl);
-				kfree_rcu(sfl, rcu);
-				return 0;
-			}
+	rcu_read_lock_bh();
+	for_each_sk_fl_rcu(np, sfl) {
+		if (sfl->fl->label == freq->flr_label) {
+			err = fl6_renew(sfl->fl, freq->flr_linger,
+					freq->flr_expires);
+			rcu_read_unlock_bh();
+			return err;
 		}
-		spin_unlock_bh(&ip6_sk_fl_lock);
-		return -ESRCH;
+	}
+	rcu_read_unlock_bh();
 
-	case IPV6_FL_A_RENEW:
-		rcu_read_lock_bh();
-		for_each_sk_fl_rcu(np, sfl) {
-			if (sfl->fl->label == freq.flr_label) {
-				err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
-				rcu_read_unlock_bh();
-				return err;
-			}
-		}
-		rcu_read_unlock_bh();
+	if (freq->flr_share == IPV6_FL_S_NONE &&
+	    ns_capable(net->user_ns, CAP_NET_ADMIN)) {
+		struct ip6_flowlabel *fl = fl_lookup(net, freq->flr_label);
 
-		if (freq.flr_share == IPV6_FL_S_NONE &&
-		    ns_capable(net->user_ns, CAP_NET_ADMIN)) {
-			fl = fl_lookup(net, freq.flr_label);
-			if (fl) {
-				err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
-				fl_release(fl);
-				return err;
-			}
+		if (fl) {
+			err = fl6_renew(fl, freq->flr_linger,
+					freq->flr_expires);
+			fl_release(fl);
+			return err;
 		}
-		return -ESRCH;
-
-	case IPV6_FL_A_GET:
-		if (freq.flr_flags & IPV6_FL_F_REFLECT) {
-			struct net *net = sock_net(sk);
-			if (net->ipv6.sysctl.flowlabel_consistency) {
-				net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
-				return -EPERM;
-			}
+	}
+	return -ESRCH;
+}
 
-			if (sk->sk_protocol != IPPROTO_TCP)
-				return -ENOPROTOOPT;
+static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
+		void __user *optval, int optlen)
+{
+	struct ipv6_fl_socklist *sfl, *sfl1 = NULL;
+	struct ip6_flowlabel *fl, *fl1 = NULL;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct net *net = sock_net(sk);
+	int uninitialized_var(err);
 
-			np->repflow = 1;
-			return 0;
+	if (freq->flr_flags & IPV6_FL_F_REFLECT) {
+		if (net->ipv6.sysctl.flowlabel_consistency) {
+			net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
+			return -EPERM;
 		}
 
-		if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
-			return -EINVAL;
+		if (sk->sk_protocol != IPPROTO_TCP)
+			return -ENOPROTOOPT;
+		np->repflow = 1;
+		return 0;
+	}
 
-		if (net->ipv6.sysctl.flowlabel_state_ranges &&
-		    (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
-			return -ERANGE;
+	if (freq->flr_label & ~IPV6_FLOWLABEL_MASK)
+		return -EINVAL;
+	if (net->ipv6.sysctl.flowlabel_state_ranges &&
+	    (freq->flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
+		return -ERANGE;
 
-		fl = fl_create(net, sk, &freq, optval, optlen, &err);
-		if (!fl)
-			return err;
-		sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
+	fl = fl_create(net, sk, freq, optval, optlen, &err);
+	if (!fl)
+		return err;
 
-		if (freq.flr_label) {
-			err = -EEXIST;
-			rcu_read_lock_bh();
-			for_each_sk_fl_rcu(np, sfl) {
-				if (sfl->fl->label == freq.flr_label) {
-					if (freq.flr_flags&IPV6_FL_F_EXCL) {
-						rcu_read_unlock_bh();
-						goto done;
-					}
-					fl1 = sfl->fl;
-					if (!atomic_inc_not_zero(&fl1->users))
-						fl1 = NULL;
-					break;
+	sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
+
+	if (freq->flr_label) {
+		err = -EEXIST;
+		rcu_read_lock_bh();
+		for_each_sk_fl_rcu(np, sfl) {
+			if (sfl->fl->label == freq->flr_label) {
+				if (freq->flr_flags & IPV6_FL_F_EXCL) {
+					rcu_read_unlock_bh();
+					goto done;
 				}
+				fl1 = sfl->fl;
+				if (!atomic_inc_not_zero(&fl1->users))
+					fl1 = NULL;
+				break;
 			}
-			rcu_read_unlock_bh();
+		}
+		rcu_read_unlock_bh();
 
-			if (!fl1)
-				fl1 = fl_lookup(net, freq.flr_label);
-			if (fl1) {
+		if (!fl1)
+			fl1 = fl_lookup(net, freq->flr_label);
+		if (fl1) {
 recheck:
-				err = -EEXIST;
-				if (freq.flr_flags&IPV6_FL_F_EXCL)
-					goto release;
-				err = -EPERM;
-				if (fl1->share == IPV6_FL_S_EXCL ||
-				    fl1->share != fl->share ||
-				    ((fl1->share == IPV6_FL_S_PROCESS) &&
-				     (fl1->owner.pid != fl->owner.pid)) ||
-				    ((fl1->share == IPV6_FL_S_USER) &&
-				     !uid_eq(fl1->owner.uid, fl->owner.uid)))
-					goto release;
-
-				err = -ENOMEM;
-				if (!sfl1)
-					goto release;
-				if (fl->linger > fl1->linger)
-					fl1->linger = fl->linger;
-				if ((long)(fl->expires - fl1->expires) > 0)
-					fl1->expires = fl->expires;
-				fl_link(np, sfl1, fl1);
-				fl_free(fl);
-				return 0;
+			err = -EEXIST;
+			if (freq->flr_flags&IPV6_FL_F_EXCL)
+				goto release;
+			err = -EPERM;
+			if (fl1->share == IPV6_FL_S_EXCL ||
+			    fl1->share != fl->share ||
+			    ((fl1->share == IPV6_FL_S_PROCESS) &&
+			     (fl1->owner.pid != fl->owner.pid)) ||
+			    ((fl1->share == IPV6_FL_S_USER) &&
+			     !uid_eq(fl1->owner.uid, fl->owner.uid)))
+				goto release;
+
+			err = -ENOMEM;
+			if (!sfl1)
+				goto release;
+			if (fl->linger > fl1->linger)
+				fl1->linger = fl->linger;
+			if ((long)(fl->expires - fl1->expires) > 0)
+				fl1->expires = fl->expires;
+			fl_link(np, sfl1, fl1);
+			fl_free(fl);
+			return 0;
 
 release:
-				fl_release(fl1);
-				goto done;
-			}
-		}
-		err = -ENOENT;
-		if (!(freq.flr_flags&IPV6_FL_F_CREATE))
+			fl_release(fl1);
 			goto done;
+		}
+	}
+	err = -ENOENT;
+	if (!(freq->flr_flags & IPV6_FL_F_CREATE))
+		goto done;
 
-		err = -ENOMEM;
-		if (!sfl1)
-			goto done;
+	err = -ENOMEM;
+	if (!sfl1)
+		goto done;
 
-		err = mem_check(sk);
-		if (err != 0)
-			goto done;
+	err = mem_check(sk);
+	if (err != 0)
+		goto done;
 
-		fl1 = fl_intern(net, fl, freq.flr_label);
-		if (fl1)
-			goto recheck;
+	fl1 = fl_intern(net, fl, freq->flr_label);
+	if (fl1)
+		goto recheck;
 
-		if (!freq.flr_label) {
-			if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
-					 &fl->label, sizeof(fl->label))) {
-				/* Intentionally ignore fault. */
-			}
+	if (!freq->flr_label) {
+		if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
+				 &fl->label, sizeof(fl->label))) {
+			/* Intentionally ignore fault. */
 		}
-
-		fl_link(np, sfl1, fl);
-		return 0;
-
-	default:
-		return -EINVAL;
 	}
 
+	fl_link(np, sfl1, fl);
+	return 0;
 done:
 	fl_free(fl);
 	kfree(sfl1);
 	return err;
 }
 
+int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
+{
+	struct in6_flowlabel_req freq;
+
+	if (optlen < sizeof(freq))
+		return -EINVAL;
+	if (copy_from_user(&freq, optval, sizeof(freq)))
+		return -EFAULT;
+
+	switch (freq.flr_action) {
+	case IPV6_FL_A_PUT:
+		return ipv6_flowlabel_put(sk, &freq);
+	case IPV6_FL_A_RENEW:
+		return ipv6_flowlabel_renew(sk, &freq);
+	case IPV6_FL_A_GET:
+		return ipv6_flowlabel_get(sk, &freq, optval, optlen);
+	default:
+		return -EINVAL;
+	}
+}
+
 #ifdef CONFIG_PROC_FS
 
 struct ip6fl_iter_state {
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (16 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 19/24] net/ipv6: factor out a ipv6_set_opt_hdr helper Christoph Hellwig
                   ` (9 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Note that the get case is pretty weird in that it actually copies data
back to userspace from setsockopt.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/ipv6.h       |  2 +-
 net/ipv6/ip6_flowlabel.c | 16 +++++++++-------
 net/ipv6/ipv6_sockglue.c |  2 +-
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 262fc88dbd7e2f..4c9d89b5d73268 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -406,7 +406,7 @@ struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
 					 struct ip6_flowlabel *fl,
 					 struct ipv6_txoptions *fopt);
 void fl6_free_socklist(struct sock *sk);
-int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
+int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
 			   int flags);
 int ip6_flowlabel_init(void);
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 27ee6de9beffc4..6b3c315f3d461a 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -371,7 +371,7 @@ static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned lo
 
 static struct ip6_flowlabel *
 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
-	  char __user *optval, int optlen, int *err_p)
+	  sockptr_t optval, int optlen, int *err_p)
 {
 	struct ip6_flowlabel *fl = NULL;
 	int olen;
@@ -401,7 +401,8 @@ fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
 		memset(fl->opt, 0, sizeof(*fl->opt));
 		fl->opt->tot_len = sizeof(*fl->opt) + olen;
 		err = -EFAULT;
-		if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
+		sockptr_advance(optval, CMSG_ALIGN(sizeof(*freq)));
+		if (copy_from_sockptr(fl->opt + 1, optval, olen))
 			goto done;
 
 		msg.msg_controllen = olen;
@@ -604,7 +605,7 @@ static int ipv6_flowlabel_renew(struct sock *sk, struct in6_flowlabel_req *freq)
 }
 
 static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct ipv6_fl_socklist *sfl, *sfl1 = NULL;
 	struct ip6_flowlabel *fl, *fl1 = NULL;
@@ -702,8 +703,9 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
 		goto recheck;
 
 	if (!freq->flr_label) {
-		if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
-				 &fl->label, sizeof(fl->label))) {
+		sockptr_advance(optval,
+				offsetof(struct in6_flowlabel_req, flr_label));
+		if (copy_to_sockptr(optval, &fl->label, sizeof(fl->label))) {
 			/* Intentionally ignore fault. */
 		}
 	}
@@ -716,13 +718,13 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
 	return err;
 }
 
-int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
+int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen)
 {
 	struct in6_flowlabel_req freq;
 
 	if (optlen < sizeof(freq))
 		return -EINVAL;
-	if (copy_from_user(&freq, optval, sizeof(freq)))
+	if (copy_from_sockptr(&freq, optval, sizeof(freq)))
 		return -EFAULT;
 
 	switch (freq.flr_action) {
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 119dfaf5f4bb26..3897fb55372d38 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -929,7 +929,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		retv = 0;
 		break;
 	case IPV6_FLOWLABEL_MGR:
-		retv = ipv6_flowlabel_opt(sk, optval, optlen);
+		retv = ipv6_flowlabel_opt(sk, USER_SOCKPTR(optval), optlen);
 		break;
 	case IPV6_IPSEC_POLICY:
 	case IPV6_XFRM_POLICY:
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 19/24] net/ipv6: factor out a ipv6_set_opt_hdr helper
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (17 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 20/24] net/ipv6: switch do_ipv6_setsockopt to sockptr_t Christoph Hellwig
                   ` (8 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Factour out a helper to set the IPv6 option headers from
do_ipv6_setsockopt.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv6/ipv6_sockglue.c | 150 +++++++++++++++++++--------------------
 1 file changed, 75 insertions(+), 75 deletions(-)

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 3897fb55372d38..90442c8366dff2 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -315,6 +315,80 @@ static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
 	return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
 }
 
+static int ipv6_set_opt_hdr(struct sock *sk, int optname, void __user *optval,
+		int optlen)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct ipv6_opt_hdr *new = NULL;
+	struct net *net = sock_net(sk);
+	struct ipv6_txoptions *opt;
+	int err;
+
+	/* hop-by-hop / destination options are privileged option */
+	if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
+		return -EPERM;
+
+	/* remove any sticky options header with a zero option
+	 * length, per RFC3542.
+	 */
+	if (optlen > 0) {
+		if (!optval)
+			return -EINVAL;
+		if (optlen < sizeof(struct ipv6_opt_hdr) ||
+		    optlen & 0x7 ||
+		    optlen > 8 * 255)
+			return -EINVAL;
+
+		new = memdup_user(optval, optlen);
+		if (IS_ERR(new))
+			return PTR_ERR(new);
+		if (unlikely(ipv6_optlen(new) > optlen)) {
+			kfree(new);
+			return -EINVAL;
+		}
+	}
+
+	opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
+	opt = ipv6_renew_options(sk, opt, optname, new);
+	kfree(new);
+	if (IS_ERR(opt))
+		return PTR_ERR(opt);
+
+	/* routing header option needs extra check */
+	err = -EINVAL;
+	if (optname == IPV6_RTHDR && opt && opt->srcrt) {
+		struct ipv6_rt_hdr *rthdr = opt->srcrt;
+		switch (rthdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+		case IPV6_SRCRT_TYPE_2:
+			if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
+				goto sticky_done;
+			break;
+#endif
+		case IPV6_SRCRT_TYPE_4:
+		{
+			struct ipv6_sr_hdr *srh =
+				(struct ipv6_sr_hdr *)opt->srcrt;
+
+			if (!seg6_validate_srh(srh, optlen, false))
+				goto sticky_done;
+			break;
+		}
+		default:
+			goto sticky_done;
+		}
+	}
+
+	err = 0;
+	opt = ipv6_update_options(sk, opt);
+sticky_done:
+	if (opt) {
+		atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+		txopt_put(opt);
+	}
+	return err;
+}
+
 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, unsigned int optlen)
 {
@@ -580,82 +654,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	case IPV6_RTHDRDSTOPTS:
 	case IPV6_RTHDR:
 	case IPV6_DSTOPTS:
-	{
-		struct ipv6_txoptions *opt;
-		struct ipv6_opt_hdr *new = NULL;
-
-		/* hop-by-hop / destination options are privileged option */
-		retv = -EPERM;
-		if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
-			break;
-
-		/* remove any sticky options header with a zero option
-		 * length, per RFC3542.
-		 */
-		if (optlen == 0)
-			optval = NULL;
-		else if (!optval)
-			goto e_inval;
-		else if (optlen < sizeof(struct ipv6_opt_hdr) ||
-			 optlen & 0x7 || optlen > 8 * 255)
-			goto e_inval;
-		else {
-			new = memdup_user(optval, optlen);
-			if (IS_ERR(new)) {
-				retv = PTR_ERR(new);
-				break;
-			}
-			if (unlikely(ipv6_optlen(new) > optlen)) {
-				kfree(new);
-				goto e_inval;
-			}
-		}
-
-		opt = rcu_dereference_protected(np->opt,
-						lockdep_sock_is_held(sk));
-		opt = ipv6_renew_options(sk, opt, optname, new);
-		kfree(new);
-		if (IS_ERR(opt)) {
-			retv = PTR_ERR(opt);
-			break;
-		}
-
-		/* routing header option needs extra check */
-		retv = -EINVAL;
-		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
-			struct ipv6_rt_hdr *rthdr = opt->srcrt;
-			switch (rthdr->type) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-			case IPV6_SRCRT_TYPE_2:
-				if (rthdr->hdrlen != 2 ||
-				    rthdr->segments_left != 1)
-					goto sticky_done;
-
-				break;
-#endif
-			case IPV6_SRCRT_TYPE_4:
-			{
-				struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
-							  opt->srcrt;
-
-				if (!seg6_validate_srh(srh, optlen, false))
-					goto sticky_done;
-				break;
-			}
-			default:
-				goto sticky_done;
-			}
-		}
-
-		retv = 0;
-		opt = ipv6_update_options(sk, opt);
-sticky_done:
-		if (opt) {
-			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
-			txopt_put(opt);
-		}
+		retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
 		break;
-	}
 
 	case IPV6_PKTINFO:
 	{
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 20/24] net/ipv6: switch do_ipv6_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (18 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 19/24] net/ipv6: factor out a ipv6_set_opt_hdr helper Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 21/24] net/udp: switch udp_lib_setsockopt " Christoph Hellwig
                   ` (7 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv6/ipv6_sockglue.c | 66 ++++++++++++++++++++--------------------
 1 file changed, 33 insertions(+), 33 deletions(-)

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 90442c8366dff2..dcd000a5a9b124 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -136,15 +136,15 @@ static bool setsockopt_needs_rtnl(int optname)
 	return false;
 }
 
-static int copy_group_source_from_user(struct group_source_req *greqs,
-		void __user *optval, int optlen)
+static int copy_group_source_from_sockptr(struct group_source_req *greqs,
+		sockptr_t optval, int optlen)
 {
 	if (in_compat_syscall()) {
 		struct compat_group_source_req gr32;
 
 		if (optlen < sizeof(gr32))
 			return -EINVAL;
-		if (copy_from_user(&gr32, optval, sizeof(gr32)))
+		if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
 			return -EFAULT;
 		greqs->gsr_interface = gr32.gsr_interface;
 		greqs->gsr_group = gr32.gsr_group;
@@ -152,7 +152,7 @@ static int copy_group_source_from_user(struct group_source_req *greqs,
 	} else {
 		if (optlen < sizeof(*greqs))
 			return -EINVAL;
-		if (copy_from_user(greqs, optval, sizeof(*greqs)))
+		if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
 			return -EFAULT;
 	}
 
@@ -160,13 +160,13 @@ static int copy_group_source_from_user(struct group_source_req *greqs,
 }
 
 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct group_source_req greqs;
 	int omode, add;
 	int ret;
 
-	ret = copy_group_source_from_user(&greqs, optval, optlen);
+	ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
 	if (ret)
 		return ret;
 
@@ -200,7 +200,7 @@ static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
 	return ip6_mc_source(add, omode, sk, &greqs);
 }
 
-static int ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
+static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
 		int optlen)
 {
 	struct group_filter *gsf;
@@ -211,7 +211,7 @@ static int ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
 	if (optlen > sysctl_optmem_max)
 		return -ENOBUFS;
 
-	gsf = memdup_user(optval, optlen);
+	gsf = memdup_sockptr(optval, optlen);
 	if (IS_ERR(gsf))
 		return PTR_ERR(gsf);
 
@@ -231,7 +231,7 @@ static int ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
 	return ret;
 }
 
-static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
+static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
 		int optlen)
 {
 	const int size0 = offsetof(struct compat_group_filter, gf_slist);
@@ -251,7 +251,7 @@ static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
 
 	gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
 	ret = -EFAULT;
-	if (copy_from_user(gf32, optval, optlen))
+	if (copy_from_sockptr(gf32, optval, optlen))
 		goto out_free_p;
 
 	/* numsrc >= (4G-140)/128 overflow in 32 bits */
@@ -276,14 +276,14 @@ static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
 }
 
 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct sockaddr_in6 *psin6;
 	struct group_req greq;
 
 	if (optlen < sizeof(greq))
 		return -EINVAL;
-	if (copy_from_user(&greq, optval, sizeof(greq)))
+	if (copy_from_sockptr(&greq, optval, sizeof(greq)))
 		return -EFAULT;
 
 	if (greq.gr_group.ss_family != AF_INET6)
@@ -296,14 +296,14 @@ static int ipv6_mcast_join_leave(struct sock *sk, int optname,
 }
 
 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
-		void __user *optval, int optlen)
+		sockptr_t optval, int optlen)
 {
 	struct compat_group_req gr32;
 	struct sockaddr_in6 *psin6;
 
 	if (optlen < sizeof(gr32))
 		return -EINVAL;
-	if (copy_from_user(&gr32, optval, sizeof(gr32)))
+	if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
 		return -EFAULT;
 
 	if (gr32.gr_group.ss_family != AF_INET6)
@@ -315,7 +315,7 @@ static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
 	return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
 }
 
-static int ipv6_set_opt_hdr(struct sock *sk, int optname, void __user *optval,
+static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
 		int optlen)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
@@ -332,14 +332,14 @@ static int ipv6_set_opt_hdr(struct sock *sk, int optname, void __user *optval,
 	 * length, per RFC3542.
 	 */
 	if (optlen > 0) {
-		if (!optval)
+		if (sockptr_is_null(optval))
 			return -EINVAL;
 		if (optlen < sizeof(struct ipv6_opt_hdr) ||
 		    optlen & 0x7 ||
 		    optlen > 8 * 255)
 			return -EINVAL;
 
-		new = memdup_user(optval, optlen);
+		new = memdup_sockptr(optval, optlen);
 		if (IS_ERR(new))
 			return PTR_ERR(new);
 		if (unlikely(ipv6_optlen(new) > optlen)) {
@@ -390,7 +390,7 @@ static int ipv6_set_opt_hdr(struct sock *sk, int optname, void __user *optval,
 }
 
 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen)
+		   sockptr_t optval, unsigned int optlen)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct net *net = sock_net(sk);
@@ -398,11 +398,11 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	int retv = -ENOPROTOOPT;
 	bool needs_rtnl = setsockopt_needs_rtnl(optname);
 
-	if (!optval)
+	if (sockptr_is_null(optval))
 		val = 0;
 	else {
 		if (optlen >= sizeof(int)) {
-			if (get_user(val, (int __user *) optval))
+			if (copy_from_sockptr(&val, optval, sizeof(val)))
 				return -EFAULT;
 		} else
 			val = 0;
@@ -411,8 +411,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	valbool = (val != 0);
 
 	if (ip6_mroute_opt(optname))
-		return ip6_mroute_setsockopt(sk, optname, USER_SOCKPTR(optval),
-					     optlen);
+		return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 
 	if (needs_rtnl)
 		rtnl_lock();
@@ -663,12 +662,13 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 
 		if (optlen == 0)
 			goto e_inval;
-		else if (optlen < sizeof(struct in6_pktinfo) || !optval)
+		else if (optlen < sizeof(struct in6_pktinfo) ||
+			 sockptr_is_null(optval))
 			goto e_inval;
 
-		if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
-				retv = -EFAULT;
-				break;
+		if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
+			retv = -EFAULT;
+			break;
 		}
 		if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 			goto e_inval;
@@ -709,7 +709,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		refcount_set(&opt->refcnt, 1);
 		opt->tot_len = sizeof(*opt) + optlen;
 		retv = -EFAULT;
-		if (copy_from_user(opt+1, optval, optlen))
+		if (copy_from_sockptr(opt + 1, optval, optlen))
 			goto done;
 
 		msg.msg_controllen = optlen;
@@ -831,7 +831,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			break;
 
 		retv = -EFAULT;
-		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
+		if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
 			break;
 
 		if (optname == IPV6_ADD_MEMBERSHIP)
@@ -849,7 +849,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			goto e_inval;
 
 		retv = -EFAULT;
-		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
+		if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
 			break;
 
 		if (optname == IPV6_JOIN_ANYCAST)
@@ -929,15 +929,14 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		retv = 0;
 		break;
 	case IPV6_FLOWLABEL_MGR:
-		retv = ipv6_flowlabel_opt(sk, USER_SOCKPTR(optval), optlen);
+		retv = ipv6_flowlabel_opt(sk, optval, optlen);
 		break;
 	case IPV6_IPSEC_POLICY:
 	case IPV6_XFRM_POLICY:
 		retv = -EPERM;
 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 			break;
-		retv = xfrm_user_policy(sk, optname, USER_SOCKPTR(optval),
-					optlen);
+		retv = xfrm_user_policy(sk, optname, optval, optlen);
 		break;
 
 	case IPV6_ADDR_PREFERENCES:
@@ -992,7 +991,8 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
+	err = do_ipv6_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
+				 optlen);
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 21/24] net/udp: switch udp_lib_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (19 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 20/24] net/ipv6: switch do_ipv6_setsockopt to sockptr_t Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 22/24] net/tcp: switch ->md5_parse " Christoph Hellwig
                   ` (6 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/udp.h | 2 +-
 net/ipv4/udp.c    | 7 ++++---
 net/ipv6/udp.c    | 3 ++-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/net/udp.h b/include/net/udp.h
index 17a9e86a807638..295d52a7359827 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -306,7 +306,7 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 		       char __user *optval, int __user *optlen);
 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
-		       char __user *optval, unsigned int optlen,
+		       sockptr_t optval, unsigned int optlen,
 		       int (*push_pending_frames)(struct sock *));
 struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 			     __be32 daddr, __be16 dport, int dif);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d4be4471c424e3..641303aa17d3dd 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2532,7 +2532,7 @@ void udp_destroy_sock(struct sock *sk)
  *	Socket option code for UDP
  */
 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
-		       char __user *optval, unsigned int optlen,
+		       sockptr_t optval, unsigned int optlen,
 		       int (*push_pending_frames)(struct sock *))
 {
 	struct udp_sock *up = udp_sk(sk);
@@ -2543,7 +2543,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -2651,7 +2651,8 @@ int udp_setsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+		return udp_lib_setsockopt(sk, level, optname,
+					  USER_SOCKPTR(optval), optlen,
 					  udp_push_pending_frames);
 	return ip_setsockopt(sk, level, optname, optval, optlen);
 }
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5aff0856a05b44..05353b31fa07bc 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1565,7 +1565,8 @@ int udpv6_setsockopt(struct sock *sk, int level, int optname,
 		     char __user *optval, unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+		return udp_lib_setsockopt(sk, level, optname,
+					  USER_SOCKPTR(optval), optlen,
 					  udp_v6_push_pending_frames);
 	return ipv6_setsockopt(sk, level, optname, optval, optlen);
 }
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 22/24] net/tcp: switch ->md5_parse to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (20 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 21/24] net/udp: switch udp_lib_setsockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 23/24] net/tcp: switch do_tcp_setsockopt " Christoph Hellwig
                   ` (5 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/net/tcp.h   | 2 +-
 net/ipv4/tcp.c      | 3 ++-
 net/ipv4/tcp_ipv4.c | 4 ++--
 net/ipv6/tcp_ipv6.c | 4 ++--
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 9f7f7c0c110451..e3c8e1d820214c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2002,7 +2002,7 @@ struct tcp_sock_af_ops {
 					 const struct sk_buff *skb);
 	int		(*md5_parse)(struct sock *sk,
 				     int optname,
-				     char __user *optval,
+				     sockptr_t optval,
 				     int optlen);
 #endif
 };
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 58ede3d62b2e2c..49bf15c27deac7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3249,7 +3249,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 #ifdef CONFIG_TCP_MD5SIG
 	case TCP_MD5SIG:
 	case TCP_MD5SIG_EXT:
-		err = tp->af_specific->md5_parse(sk, optname, optval, optlen);
+		err = tp->af_specific->md5_parse(sk, optname,
+						 USER_SOCKPTR(optval), optlen);
 		break;
 #endif
 	case TCP_USER_TIMEOUT:
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index cd81b6e04efbfa..a03e70b3af2e6c 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1194,7 +1194,7 @@ static void tcp_clear_md5_list(struct sock *sk)
 }
 
 static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
-				 char __user *optval, int optlen)
+				 sockptr_t optval, int optlen)
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
@@ -1205,7 +1205,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
 	if (optlen < sizeof(cmd))
 		return -EINVAL;
 
-	if (copy_from_user(&cmd, optval, sizeof(cmd)))
+	if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
 		return -EFAULT;
 
 	if (sin->sin_family != AF_INET)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c34b7834fd84a8..305870a72352d6 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -567,7 +567,7 @@ static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
 }
 
 static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
-				 char __user *optval, int optlen)
+				 sockptr_t optval, int optlen)
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
@@ -577,7 +577,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 	if (optlen < sizeof(cmd))
 		return -EINVAL;
 
-	if (copy_from_user(&cmd, optval, sizeof(cmd)))
+	if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
 		return -EFAULT;
 
 	if (sin6->sin6_family != AF_INET6)
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 23/24] net/tcp: switch do_tcp_setsockopt to sockptr_t
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (21 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 22/24] net/tcp: switch ->md5_parse " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
                   ` (4 subsequent siblings)
  27 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv4/tcp.c | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 49bf15c27deac7..71cbc61c335f71 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2764,7 +2764,7 @@ static inline bool tcp_can_repair_sock(const struct sock *sk)
 		(sk->sk_state != TCP_LISTEN);
 }
 
-static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int len)
+static int tcp_repair_set_window(struct tcp_sock *tp, sockptr_t optbuf, int len)
 {
 	struct tcp_repair_window opt;
 
@@ -2774,7 +2774,7 @@ static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int l
 	if (len != sizeof(opt))
 		return -EINVAL;
 
-	if (copy_from_user(&opt, optbuf, sizeof(opt)))
+	if (copy_from_sockptr(&opt, optbuf, sizeof(opt)))
 		return -EFAULT;
 
 	if (opt.max_window < opt.snd_wnd)
@@ -2796,17 +2796,17 @@ static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int l
 	return 0;
 }
 
-static int tcp_repair_options_est(struct sock *sk,
-		struct tcp_repair_opt __user *optbuf, unsigned int len)
+static int tcp_repair_options_est(struct sock *sk, sockptr_t optbuf,
+		unsigned int len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_repair_opt opt;
 
 	while (len >= sizeof(opt)) {
-		if (copy_from_user(&opt, optbuf, sizeof(opt)))
+		if (copy_from_sockptr(&opt, optbuf, sizeof(opt)))
 			return -EFAULT;
 
-		optbuf++;
+		sockptr_advance(optbuf, sizeof(opt));
 		len -= sizeof(opt);
 
 		switch (opt.opt_code) {
@@ -3020,8 +3020,8 @@ EXPORT_SYMBOL(tcp_sock_set_keepcnt);
 /*
  *	Socket option code for TCP.
  */
-static int do_tcp_setsockopt(struct sock *sk, int level,
-		int optname, char __user *optval, unsigned int optlen)
+static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -3037,7 +3037,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		if (optlen < 1)
 			return -EINVAL;
 
-		val = strncpy_from_user(name, optval,
+		val = strncpy_from_sockptr(name, optval,
 					min_t(long, TCP_CA_NAME_MAX-1, optlen));
 		if (val < 0)
 			return -EFAULT;
@@ -3056,7 +3056,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		if (optlen < 1)
 			return -EINVAL;
 
-		val = strncpy_from_user(name, optval,
+		val = strncpy_from_sockptr(name, optval,
 					min_t(long, TCP_ULP_NAME_MAX - 1,
 					      optlen));
 		if (val < 0)
@@ -3079,7 +3079,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		    optlen != TCP_FASTOPEN_KEY_BUF_LENGTH)
 			return -EINVAL;
 
-		if (copy_from_user(key, optval, optlen))
+		if (copy_from_sockptr(key, optval, optlen))
 			return -EFAULT;
 
 		if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH)
@@ -3095,7 +3095,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	lock_sock(sk);
@@ -3174,9 +3174,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		if (!tp->repair)
 			err = -EINVAL;
 		else if (sk->sk_state == TCP_ESTABLISHED)
-			err = tcp_repair_options_est(sk,
-					(struct tcp_repair_opt __user *)optval,
-					optlen);
+			err = tcp_repair_options_est(sk, optval, optlen);
 		else
 			err = -EPERM;
 		break;
@@ -3249,8 +3247,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 #ifdef CONFIG_TCP_MD5SIG
 	case TCP_MD5SIG:
 	case TCP_MD5SIG_EXT:
-		err = tp->af_specific->md5_parse(sk, optname,
-						 USER_SOCKPTR(optval), optlen);
+		err = tp->af_specific->md5_parse(sk, optname, optval, optlen);
 		break;
 #endif
 	case TCP_USER_TIMEOUT:
@@ -3334,7 +3331,8 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
 	if (level != SOL_TCP)
 		return icsk->icsk_af_ops->setsockopt(sk, level, optname,
 						     optval, optlen);
-	return do_tcp_setsockopt(sk, level, optname, optval, optlen);
+	return do_tcp_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
+				 optlen);
 }
 EXPORT_SYMBOL(tcp_setsockopt);
 
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* [PATCH 24/24] net: pass a sockptr_t into ->setsockopt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (22 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 23/24] net/tcp: switch do_tcp_setsockopt " Christoph Hellwig
@ 2020-07-20 12:47 ` Christoph Hellwig
  2020-07-20 14:19   ` Stefan Schmidt
  2020-07-22  8:26   ` [MPTCP] " Matthieu Baerts
  2020-07-20 16:38 ` get rid of the address_space override in setsockopt Eric Biggers
                   ` (3 subsequent siblings)
  27 siblings, 2 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 12:47 UTC (permalink / raw)
  To: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Rework the remaining setsockopt code to pass a sockptr_t instead of a
plain user pointer.  This removes the last remaining set_fs(KERNEL_DS)
outside of architecture specific code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 crypto/af_alg.c                           |  7 ++--
 drivers/crypto/chelsio/chtls/chtls_main.c | 18 ++++++-----
 drivers/isdn/mISDN/socket.c               |  4 +--
 include/linux/net.h                       |  4 ++-
 include/net/inet_connection_sock.h        |  3 +-
 include/net/ip.h                          |  2 +-
 include/net/ipv6.h                        |  4 +--
 include/net/sctp/structs.h                |  2 +-
 include/net/sock.h                        |  4 +--
 include/net/tcp.h                         |  4 +--
 net/atm/common.c                          |  6 ++--
 net/atm/common.h                          |  2 +-
 net/atm/pvc.c                             |  2 +-
 net/atm/svc.c                             |  6 ++--
 net/ax25/af_ax25.c                        |  6 ++--
 net/bluetooth/hci_sock.c                  |  8 ++---
 net/bluetooth/l2cap_sock.c                | 22 ++++++-------
 net/bluetooth/rfcomm/sock.c               | 12 ++++---
 net/bluetooth/sco.c                       |  6 ++--
 net/caif/caif_socket.c                    |  8 ++---
 net/can/j1939/socket.c                    | 12 +++----
 net/can/raw.c                             | 16 +++++-----
 net/core/sock.c                           |  2 +-
 net/dccp/dccp.h                           |  2 +-
 net/dccp/proto.c                          | 20 ++++++------
 net/decnet/af_decnet.c                    | 16 ++++++----
 net/ieee802154/socket.c                   |  6 ++--
 net/ipv4/ip_sockglue.c                    | 13 +++-----
 net/ipv4/raw.c                            |  8 ++---
 net/ipv4/tcp.c                            |  5 ++-
 net/ipv4/udp.c                            |  6 ++--
 net/ipv4/udp_impl.h                       |  4 +--
 net/ipv6/ipv6_sockglue.c                  | 10 +++---
 net/ipv6/raw.c                            | 10 +++---
 net/ipv6/udp.c                            |  6 ++--
 net/ipv6/udp_impl.h                       |  4 +--
 net/iucv/af_iucv.c                        |  4 +--
 net/kcm/kcmsock.c                         |  6 ++--
 net/l2tp/l2tp_ppp.c                       |  4 +--
 net/llc/af_llc.c                          |  4 +--
 net/mptcp/protocol.c                      | 14 ++++----
 net/netlink/af_netlink.c                  |  4 +--
 net/netrom/af_netrom.c                    |  4 +--
 net/nfc/llcp_sock.c                       |  6 ++--
 net/packet/af_packet.c                    | 39 ++++++++++++-----------
 net/phonet/pep.c                          |  4 +--
 net/rds/af_rds.c                          | 30 ++++++++---------
 net/rds/rdma.c                            | 14 ++++----
 net/rds/rds.h                             |  6 ++--
 net/rose/af_rose.c                        |  4 +--
 net/rxrpc/af_rxrpc.c                      |  8 ++---
 net/rxrpc/ar-internal.h                   |  4 +--
 net/rxrpc/key.c                           |  9 +++---
 net/sctp/socket.c                         |  4 +--
 net/smc/af_smc.c                          |  4 +--
 net/socket.c                              | 23 ++++---------
 net/tipc/socket.c                         |  8 ++---
 net/tls/tls_main.c                        | 17 +++++-----
 net/vmw_vsock/af_vsock.c                  |  4 +--
 net/x25/af_x25.c                          |  4 +--
 net/xdp/xsk.c                             |  8 ++---
 61 files changed, 248 insertions(+), 258 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 29f71428520b4b..892242a42c3ec9 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -197,8 +197,7 @@ static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 	return err;
 }
 
-static int alg_setkey(struct sock *sk, char __user *ukey,
-		      unsigned int keylen)
+static int alg_setkey(struct sock *sk, sockptr_t ukey, unsigned int keylen)
 {
 	struct alg_sock *ask = alg_sk(sk);
 	const struct af_alg_type *type = ask->type;
@@ -210,7 +209,7 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
 		return -ENOMEM;
 
 	err = -EFAULT;
-	if (copy_from_user(key, ukey, keylen))
+	if (copy_from_sockptr(key, ukey, keylen))
 		goto out;
 
 	err = type->setkey(ask->private, key, keylen);
@@ -222,7 +221,7 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
 }
 
 static int alg_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct alg_sock *ask = alg_sk(sk);
diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c
index d98b89d0fa6eeb..c3058dcdb33c5c 100644
--- a/drivers/crypto/chelsio/chtls/chtls_main.c
+++ b/drivers/crypto/chelsio/chtls/chtls_main.c
@@ -488,7 +488,7 @@ static int chtls_getsockopt(struct sock *sk, int level, int optname,
 }
 
 static int do_chtls_setsockopt(struct sock *sk, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct tls_crypto_info *crypto_info, tmp_crypto_info;
 	struct chtls_sock *csk;
@@ -498,12 +498,12 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
 
 	csk = rcu_dereference_sk_user_data(sk);
 
-	if (!optval || optlen < sizeof(*crypto_info)) {
+	if (sockptr_is_null(optval) || optlen < sizeof(*crypto_info)) {
 		rc = -EINVAL;
 		goto out;
 	}
 
-	rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
+	rc = copy_from_sockptr(&tmp_crypto_info, optval, sizeof(*crypto_info));
 	if (rc) {
 		rc = -EFAULT;
 		goto out;
@@ -525,8 +525,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
 		/* Obtain version and type from previous copy */
 		crypto_info[0] = tmp_crypto_info;
 		/* Now copy the following data */
-		rc = copy_from_user((char *)crypto_info + sizeof(*crypto_info),
-				optval + sizeof(*crypto_info),
+		sockptr_advance(optval, sizeof(*crypto_info));
+		rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
+				optval,
 				sizeof(struct tls12_crypto_info_aes_gcm_128)
 				- sizeof(*crypto_info));
 
@@ -541,8 +542,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
 	}
 	case TLS_CIPHER_AES_GCM_256: {
 		crypto_info[0] = tmp_crypto_info;
-		rc = copy_from_user((char *)crypto_info + sizeof(*crypto_info),
-				    optval + sizeof(*crypto_info),
+		sockptr_advance(optval, sizeof(*crypto_info));
+		rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
+				    optval,
 				sizeof(struct tls12_crypto_info_aes_gcm_256)
 				- sizeof(*crypto_info));
 
@@ -565,7 +567,7 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
 }
 
 static int chtls_setsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, unsigned int optlen)
+			    sockptr_t optval, unsigned int optlen)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
 
diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index 1b2b91479107bc..2835daae9e9f3a 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -401,7 +401,7 @@ data_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 }
 
 static int data_sock_setsockopt(struct socket *sock, int level, int optname,
-				char __user *optval, unsigned int len)
+				sockptr_t optval, unsigned int len)
 {
 	struct sock *sk = sock->sk;
 	int err = 0, opt = 0;
@@ -414,7 +414,7 @@ static int data_sock_setsockopt(struct socket *sock, int level, int optname,
 
 	switch (optname) {
 	case MISDN_TIME_STAMP:
-		if (get_user(opt, (int __user *)optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(int))) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/include/linux/net.h b/include/linux/net.h
index 858ff1d981540d..d48ff11808794c 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -21,6 +21,7 @@
 #include <linux/rcupdate.h>
 #include <linux/once.h>
 #include <linux/fs.h>
+#include <linux/sockptr.h>
 
 #include <uapi/linux/net.h>
 
@@ -162,7 +163,8 @@ struct proto_ops {
 	int		(*listen)    (struct socket *sock, int len);
 	int		(*shutdown)  (struct socket *sock, int flags);
 	int		(*setsockopt)(struct socket *sock, int level,
-				      int optname, char __user *optval, unsigned int optlen);
+				      int optname, sockptr_t optval,
+				      unsigned int optlen);
 	int		(*getsockopt)(struct socket *sock, int level,
 				      int optname, char __user *optval, int __user *optlen);
 	void		(*show_fdinfo)(struct seq_file *m, struct socket *sock);
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 157c60cca0ca60..1e209ce7d1bd1b 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -16,6 +16,7 @@
 #include <linux/timer.h>
 #include <linux/poll.h>
 #include <linux/kernel.h>
+#include <linux/sockptr.h>
 
 #include <net/inet_sock.h>
 #include <net/request_sock.h>
@@ -45,7 +46,7 @@ struct inet_connection_sock_af_ops {
 	u16	    net_frag_header_len;
 	u16	    sockaddr_len;
 	int	    (*setsockopt)(struct sock *sk, int level, int optname,
-				  char __user *optval, unsigned int optlen);
+				  sockptr_t optval, unsigned int optlen);
 	int	    (*getsockopt)(struct sock *sk, int level, int optname,
 				  char __user *optval, int __user *optlen);
 	void	    (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
diff --git a/include/net/ip.h b/include/net/ip.h
index d66ad3a9522081..b09c48d862cc10 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -722,7 +722,7 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
 			 struct sk_buff *skb, int tlen, int offset);
 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
 		 struct ipcm_cookie *ipc, bool allow_ipv6);
-int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
+int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
 		  unsigned int optlen);
 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
 		  int __user *optlen);
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 4c9d89b5d73268..bd1f396cc9c729 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1084,8 +1084,8 @@ struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
  *	socket options (ipv6_sockglue.c)
  */
 
-int ipv6_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen);
+int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		    unsigned int optlen);
 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, int __user *optlen);
 
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 233bbf7df5d66c..b33f1aefad0989 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -431,7 +431,7 @@ struct sctp_af {
 	int		(*setsockopt)	(struct sock *sk,
 					 int level,
 					 int optname,
-					 char __user *optval,
+					 sockptr_t optval,
 					 unsigned int optlen);
 	int		(*getsockopt)	(struct sock *sk,
 					 int level,
diff --git a/include/net/sock.h b/include/net/sock.h
index bfb2fe2fc36876..2cc3ba667908de 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1141,7 +1141,7 @@ struct proto {
 	void			(*destroy)(struct sock *sk);
 	void			(*shutdown)(struct sock *sk, int how);
 	int			(*setsockopt)(struct sock *sk, int level,
-					int optname, char __user *optval,
+					int optname, sockptr_t optval,
 					unsigned int optlen);
 	int			(*getsockopt)(struct sock *sk, int level,
 					int optname, char __user *optval,
@@ -1734,7 +1734,7 @@ int sock_common_getsockopt(struct socket *sock, int level, int optname,
 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 			int flags);
 int sock_common_setsockopt(struct socket *sock, int level, int optname,
-				  char __user *optval, unsigned int optlen);
+			   sockptr_t optval, unsigned int optlen);
 
 void sk_common_release(struct sock *sk);
 
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e3c8e1d820214c..e0c35d56091f22 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -399,8 +399,8 @@ __poll_t tcp_poll(struct file *file, struct socket *sock,
 		      struct poll_table_struct *wait);
 int tcp_getsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, int __user *optlen);
-int tcp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, unsigned int optlen);
+int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		   unsigned int optlen);
 void tcp_set_keepalive(struct sock *sk, int val);
 void tcp_syn_ack_timeout(const struct request_sock *req);
 int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
diff --git a/net/atm/common.c b/net/atm/common.c
index 9b28f1fb3c69c8..84367b844b1473 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -745,7 +745,7 @@ static int check_qos(const struct atm_qos *qos)
 }
 
 int vcc_setsockopt(struct socket *sock, int level, int optname,
-		   char __user *optval, unsigned int optlen)
+		   sockptr_t optval, unsigned int optlen)
 {
 	struct atm_vcc *vcc;
 	unsigned long value;
@@ -760,7 +760,7 @@ int vcc_setsockopt(struct socket *sock, int level, int optname,
 	{
 		struct atm_qos qos;
 
-		if (copy_from_user(&qos, optval, sizeof(qos)))
+		if (copy_from_sockptr(&qos, optval, sizeof(qos)))
 			return -EFAULT;
 		error = check_qos(&qos);
 		if (error)
@@ -774,7 +774,7 @@ int vcc_setsockopt(struct socket *sock, int level, int optname,
 		return 0;
 	}
 	case SO_SETCLP:
-		if (get_user(value, (unsigned long __user *)optval))
+		if (copy_from_sockptr(&value, optval, sizeof(value)))
 			return -EFAULT;
 		if (value)
 			vcc->atm_options |= ATM_ATMOPT_CLP;
diff --git a/net/atm/common.h b/net/atm/common.h
index 5850649068bb29..a1e56e8de698a3 100644
--- a/net/atm/common.h
+++ b/net/atm/common.h
@@ -21,7 +21,7 @@ __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait);
 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 int vcc_setsockopt(struct socket *sock, int level, int optname,
-		   char __user *optval, unsigned int optlen);
+		   sockptr_t optval, unsigned int optlen);
 int vcc_getsockopt(struct socket *sock, int level, int optname,
 		   char __user *optval, int __user *optlen);
 void vcc_process_recv_queue(struct atm_vcc *vcc);
diff --git a/net/atm/pvc.c b/net/atm/pvc.c
index 02bd2a436bdf9e..53e7d3f39e26cc 100644
--- a/net/atm/pvc.c
+++ b/net/atm/pvc.c
@@ -63,7 +63,7 @@ static int pvc_connect(struct socket *sock, struct sockaddr *sockaddr,
 }
 
 static int pvc_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	int error;
diff --git a/net/atm/svc.c b/net/atm/svc.c
index ba144d035e3d41..4a02bcaad279f8 100644
--- a/net/atm/svc.c
+++ b/net/atm/svc.c
@@ -451,7 +451,7 @@ int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 }
 
 static int svc_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct atm_vcc *vcc = ATM_SD(sock);
@@ -464,7 +464,7 @@ static int svc_setsockopt(struct socket *sock, int level, int optname,
 			error = -EINVAL;
 			goto out;
 		}
-		if (copy_from_user(&vcc->sap, optval, optlen)) {
+		if (copy_from_sockptr(&vcc->sap, optval, optlen)) {
 			error = -EFAULT;
 			goto out;
 		}
@@ -475,7 +475,7 @@ static int svc_setsockopt(struct socket *sock, int level, int optname,
 			error = -EINVAL;
 			goto out;
 		}
-		if (get_user(value, (int __user *)optval)) {
+		if (copy_from_sockptr(&value, optval, sizeof(int))) {
 			error = -EFAULT;
 			goto out;
 		}
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index fd91cd34f25e03..17bf31a8969284 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -528,7 +528,7 @@ ax25_cb *ax25_create_cb(void)
  */
 
 static int ax25_setsockopt(struct socket *sock, int level, int optname,
-	char __user *optval, unsigned int optlen)
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	ax25_cb *ax25;
@@ -543,7 +543,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(unsigned int))
 		return -EINVAL;
 
-	if (get_user(opt, (unsigned int __user *)optval))
+	if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
 		return -EFAULT;
 
 	lock_sock(sk);
@@ -640,7 +640,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
 
 		memset(devname, 0, sizeof(devname));
 
-		if (copy_from_user(devname, optval, optlen)) {
+		if (copy_from_sockptr(devname, optval, optlen)) {
 			res = -EFAULT;
 			break;
 		}
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index caf38a8ea6a8ba..d5eff27d5b1e17 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1842,7 +1842,7 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 }
 
 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, unsigned int len)
+			       sockptr_t optval, unsigned int len)
 {
 	struct hci_ufilter uf = { .opcode = 0 };
 	struct sock *sk = sock->sk;
@@ -1862,7 +1862,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
 
 	switch (optname) {
 	case HCI_DATA_DIR:
-		if (get_user(opt, (int __user *)optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1874,7 +1874,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case HCI_TIME_STAMP:
-		if (get_user(opt, (int __user *)optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1896,7 +1896,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
 		}
 
 		len = min_t(unsigned int, len, sizeof(uf));
-		if (copy_from_user(&uf, optval, len)) {
+		if (copy_from_sockptr(&uf, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index a995d2c51fa7f1..a3d104123f38dd 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -703,7 +703,7 @@ static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
 }
 
 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
-				     char __user *optval, unsigned int optlen)
+				     sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
@@ -736,7 +736,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 		opts.txwin_size = chan->tx_win;
 
 		len = min_t(unsigned int, sizeof(opts), optlen);
-		if (copy_from_user((char *) &opts, optval, len)) {
+		if (copy_from_sockptr(&opts, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
@@ -782,7 +782,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 		break;
 
 	case L2CAP_LM:
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -859,7 +859,7 @@ static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
 }
 
 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
-				 char __user *optval, unsigned int optlen)
+				 sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
@@ -891,7 +891,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 		sec.level = BT_SECURITY_LOW;
 
 		len = min_t(unsigned int, sizeof(sec), optlen);
-		if (copy_from_user((char *) &sec, optval, len)) {
+		if (copy_from_sockptr(&sec, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
@@ -939,7 +939,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -954,7 +954,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case BT_FLUSHABLE:
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -990,7 +990,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 		pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
 
 		len = min_t(unsigned int, sizeof(pwr), optlen);
-		if (copy_from_user((char *) &pwr, optval, len)) {
+		if (copy_from_sockptr(&pwr, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
@@ -1002,7 +1002,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case BT_CHANNEL_POLICY:
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1050,7 +1050,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u16 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
 			err = -EFAULT;
 			break;
 		}
@@ -1081,7 +1081,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u8 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u8))) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index df14eebe80da8b..dba4ea0e1b0dc7 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -644,7 +644,8 @@ static int rfcomm_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 	return len;
 }
 
-static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
+static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	int err = 0;
@@ -656,7 +657,7 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __u
 
 	switch (optname) {
 	case RFCOMM_LM:
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -685,7 +686,8 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __u
 	return err;
 }
 
-static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
+static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct bt_security sec;
@@ -713,7 +715,7 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
 		sec.level = BT_SECURITY_LOW;
 
 		len = min_t(unsigned int, sizeof(sec), optlen);
-		if (copy_from_user((char *) &sec, optval, len)) {
+		if (copy_from_sockptr(&sec, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
@@ -732,7 +734,7 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c8c3d38cdc7b56..37260baf71507b 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -791,7 +791,7 @@ static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 }
 
 static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	int len, err = 0;
@@ -810,7 +810,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -831,7 +831,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 		voice.setting = sco_pi(sk)->setting;
 
 		len = min_t(unsigned int, sizeof(voice), optlen);
-		if (copy_from_user((char *)&voice, optval, len)) {
+		if (copy_from_sockptr(&voice, optval, len)) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index b94ecd931002e7..3ad0a1df671283 100644
--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -669,8 +669,8 @@ static int caif_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 	return sent ? : err;
 }
 
-static int setsockopt(struct socket *sock,
-		      int lvl, int opt, char __user *ov, unsigned int ol)
+static int setsockopt(struct socket *sock, int lvl, int opt, sockptr_t ov,
+		unsigned int ol)
 {
 	struct sock *sk = sock->sk;
 	struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
@@ -685,7 +685,7 @@ static int setsockopt(struct socket *sock,
 			return -EINVAL;
 		if (lvl != SOL_CAIF)
 			goto bad_sol;
-		if (copy_from_user(&linksel, ov, sizeof(int)))
+		if (copy_from_sockptr(&linksel, ov, sizeof(int)))
 			return -EINVAL;
 		lock_sock(&(cf_sk->sk));
 		cf_sk->conn_req.link_selector = linksel;
@@ -699,7 +699,7 @@ static int setsockopt(struct socket *sock,
 			return -ENOPROTOOPT;
 		lock_sock(&(cf_sk->sk));
 		if (ol > sizeof(cf_sk->conn_req.param.data) ||
-			copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
+		    copy_from_sockptr(&cf_sk->conn_req.param.data, ov, ol)) {
 			release_sock(&cf_sk->sk);
 			return -EINVAL;
 		}
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index f7587428febdd2..78ff9b3f1d40c7 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -627,14 +627,14 @@ static int j1939_sk_release(struct socket *sock)
 	return 0;
 }
 
-static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
+static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, sockptr_t optval,
 				    unsigned int optlen, int flag)
 {
 	int tmp;
 
 	if (optlen != sizeof(tmp))
 		return -EINVAL;
-	if (copy_from_user(&tmp, optval, optlen))
+	if (copy_from_sockptr(&tmp, optval, optlen))
 		return -EFAULT;
 	lock_sock(&jsk->sk);
 	if (tmp)
@@ -646,7 +646,7 @@ static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
 }
 
 static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct j1939_sock *jsk = j1939_sk(sk);
@@ -658,7 +658,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
 
 	switch (optname) {
 	case SO_J1939_FILTER:
-		if (optval) {
+		if (!sockptr_is_null(optval)) {
 			struct j1939_filter *f;
 			int c;
 
@@ -670,7 +670,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
 				return -EINVAL;
 
 			count = optlen / sizeof(*filters);
-			filters = memdup_user(optval, optlen);
+			filters = memdup_sockptr(optval, optlen);
 			if (IS_ERR(filters))
 				return PTR_ERR(filters);
 
@@ -703,7 +703,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
 	case SO_J1939_SEND_PRIO:
 		if (optlen != sizeof(tmp))
 			return -EINVAL;
-		if (copy_from_user(&tmp, optval, optlen))
+		if (copy_from_sockptr(&tmp, optval, optlen))
 			return -EFAULT;
 		if (tmp < 0 || tmp > 7)
 			return -EDOM;
diff --git a/net/can/raw.c b/net/can/raw.c
index 59c039d73c6d58..94a9405658dc61 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -485,7 +485,7 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
 }
 
 static int raw_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct raw_sock *ro = raw_sk(sk);
@@ -511,11 +511,11 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 
 		if (count > 1) {
 			/* filter does not fit into dfilter => alloc space */
-			filter = memdup_user(optval, optlen);
+			filter = memdup_sockptr(optval, optlen);
 			if (IS_ERR(filter))
 				return PTR_ERR(filter);
 		} else if (count == 1) {
-			if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
+			if (copy_from_sockptr(&sfilter, optval, sizeof(sfilter)))
 				return -EFAULT;
 		}
 
@@ -568,7 +568,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(err_mask))
 			return -EINVAL;
 
-		if (copy_from_user(&err_mask, optval, optlen))
+		if (copy_from_sockptr(&err_mask, optval, optlen))
 			return -EFAULT;
 
 		err_mask &= CAN_ERR_MASK;
@@ -607,7 +607,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(ro->loopback))
 			return -EINVAL;
 
-		if (copy_from_user(&ro->loopback, optval, optlen))
+		if (copy_from_sockptr(&ro->loopback, optval, optlen))
 			return -EFAULT;
 
 		break;
@@ -616,7 +616,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(ro->recv_own_msgs))
 			return -EINVAL;
 
-		if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
+		if (copy_from_sockptr(&ro->recv_own_msgs, optval, optlen))
 			return -EFAULT;
 
 		break;
@@ -625,7 +625,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(ro->fd_frames))
 			return -EINVAL;
 
-		if (copy_from_user(&ro->fd_frames, optval, optlen))
+		if (copy_from_sockptr(&ro->fd_frames, optval, optlen))
 			return -EFAULT;
 
 		break;
@@ -634,7 +634,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(ro->join_filters))
 			return -EINVAL;
 
-		if (copy_from_user(&ro->join_filters, optval, optlen))
+		if (copy_from_sockptr(&ro->join_filters, optval, optlen))
 			return -EFAULT;
 
 		break;
diff --git a/net/core/sock.c b/net/core/sock.c
index 9cf8318bc51de4..ff22629f10ce92 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3210,7 +3210,7 @@ EXPORT_SYMBOL(sock_common_recvmsg);
  *	Set socket options on an inet socket.
  */
 int sock_common_setsockopt(struct socket *sock, int level, int optname,
-			   char __user *optval, unsigned int optlen)
+			   sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 434eea91b7679d..9cc9d1ee6cdb9a 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -295,7 +295,7 @@ int dccp_disconnect(struct sock *sk, int flags);
 int dccp_getsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, int __user *optlen);
 int dccp_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen);
+		    sockptr_t optval, unsigned int optlen);
 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index fd92d3fe321f08..9e58787047f197 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -402,7 +402,7 @@ int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 EXPORT_SYMBOL_GPL(dccp_ioctl);
 
 static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
-				   char __user *optval, unsigned int optlen)
+				   sockptr_t optval, unsigned int optlen)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct dccp_service_list *sl = NULL;
@@ -417,9 +417,9 @@ static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
 			return -ENOMEM;
 
 		sl->dccpsl_nr = optlen / sizeof(u32) - 1;
-		if (copy_from_user(sl->dccpsl_list,
-				   optval + sizeof(service),
-				   optlen - sizeof(service)) ||
+		sockptr_advance(optval, sizeof(service));
+		if (copy_from_sockptr(sl->dccpsl_list, optval,
+				      optlen - sizeof(service)) ||
 		    dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
 			kfree(sl);
 			return -EFAULT;
@@ -473,7 +473,7 @@ static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
 }
 
 static int dccp_setsockopt_ccid(struct sock *sk, int type,
-				char __user *optval, unsigned int optlen)
+				sockptr_t optval, unsigned int optlen)
 {
 	u8 *val;
 	int rc = 0;
@@ -481,7 +481,7 @@ static int dccp_setsockopt_ccid(struct sock *sk, int type,
 	if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
 		return -EINVAL;
 
-	val = memdup_user(optval, optlen);
+	val = memdup_sockptr(optval, optlen);
 	if (IS_ERR(val))
 		return PTR_ERR(val);
 
@@ -498,7 +498,7 @@ static int dccp_setsockopt_ccid(struct sock *sk, int type,
 }
 
 static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
-		char __user *optval, unsigned int optlen)
+		sockptr_t optval, unsigned int optlen)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	int val, err = 0;
@@ -520,7 +520,7 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
 	if (optlen < (int)sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	if (optname == DCCP_SOCKOPT_SERVICE)
@@ -563,8 +563,8 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
 	return err;
 }
 
-int dccp_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen)
+int dccp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		    unsigned int optlen)
 {
 	if (level != SOL_DCCP)
 		return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 7d51ab608fb3f1..3b53d766789d47 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -150,7 +150,8 @@ static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 static struct hlist_head dn_wild_sk;
 static atomic_long_t decnet_memory_allocated;
 
-static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
+static int __dn_setsockopt(struct socket *sock, int level, int optname,
+		sockptr_t optval, unsigned int optlen, int flags);
 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 
 static struct hlist_head *dn_find_list(struct sock *sk)
@@ -1320,7 +1321,8 @@ static int dn_shutdown(struct socket *sock, int how)
 	return err;
 }
 
-static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
+static int dn_setsockopt(struct socket *sock, int level, int optname,
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	int err;
@@ -1332,14 +1334,14 @@ static int dn_setsockopt(struct socket *sock, int level, int optname, char __use
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
 	    optname != DSO_STREAM && optname != DSO_SEQPACKET)
-		err = nf_setsockopt(sk, PF_DECnet, optname,
-				    USER_SOCKPTR(optval), optlen);
+		err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
 #endif
 
 	return err;
 }
 
-static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
+static int __dn_setsockopt(struct socket *sock, int level, int optname,
+		sockptr_t optval, unsigned int optlen, int flags)
 {
 	struct	sock *sk = sock->sk;
 	struct dn_scp *scp = DN_SK(sk);
@@ -1355,13 +1357,13 @@ static int __dn_setsockopt(struct socket *sock, int level,int optname, char __us
 	} u;
 	int err;
 
-	if (optlen && !optval)
+	if (optlen && sockptr_is_null(optval))
 		return -EINVAL;
 
 	if (optlen > sizeof(u))
 		return -EINVAL;
 
-	if (copy_from_user(&u, optval, optlen))
+	if (copy_from_sockptr(&u, optval, optlen))
 		return -EFAULT;
 
 	switch (optname) {
diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 94ae9662133e30..a45a0401adc50b 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -382,7 +382,7 @@ static int raw_getsockopt(struct sock *sk, int level, int optname,
 }
 
 static int raw_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	return -EOPNOTSUPP;
 }
@@ -872,7 +872,7 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,
 }
 
 static int dgram_setsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, unsigned int optlen)
+			    sockptr_t optval, unsigned int optlen)
 {
 	struct dgram_sock *ro = dgram_sk(sk);
 	struct net *net = sock_net(sk);
@@ -882,7 +882,7 @@ static int dgram_setsockopt(struct sock *sk, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	lock_sock(sk);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index f7f1507b89fe24..8dc027e54c5bfb 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1401,21 +1401,19 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
 	skb_dst_drop(skb);
 }
 
-int ip_setsockopt(struct sock *sk, int level,
-		int optname, char __user *optval, unsigned int optlen)
+int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		unsigned int optlen)
 {
 	int err;
 
 	if (level != SOL_IP)
 		return -ENOPROTOOPT;
 
-	err = do_ip_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
-			       optlen);
+	err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
 	if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
 	    optname < BPFILTER_IPT_SET_MAX)
-		err = bpfilter_ip_set_sockopt(sk, optname, USER_SOCKPTR(optval),
-					      optlen);
+		err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
 #endif
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
@@ -1423,8 +1421,7 @@ int ip_setsockopt(struct sock *sk, int level,
 			optname != IP_IPSEC_POLICY &&
 			optname != IP_XFRM_POLICY &&
 			!ip_mroute_opt(optname))
-		err = nf_setsockopt(sk, PF_INET, optname, USER_SOCKPTR(optval),
-				    optlen);
+		err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 #endif
 	return err;
 }
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 2a57d633b31e00..6fd4330287c279 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -809,11 +809,11 @@ static int raw_sk_init(struct sock *sk)
 	return 0;
 }
 
-static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
+static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
 {
 	if (optlen > sizeof(struct icmp_filter))
 		optlen = sizeof(struct icmp_filter);
-	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
+	if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
 		return -EFAULT;
 	return 0;
 }
@@ -838,7 +838,7 @@ out:	return ret;
 }
 
 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			     sockptr_t optval, unsigned int optlen)
 {
 	if (optname == ICMP_FILTER) {
 		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
@@ -850,7 +850,7 @@ static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 }
 
 static int raw_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	if (level != SOL_RAW)
 		return ip_setsockopt(sk, level, optname, optval, optlen);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 71cbc61c335f71..27de9380ed140e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3323,7 +3323,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 	return err;
 }
 
-int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
+int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
 		   unsigned int optlen)
 {
 	const struct inet_connection_sock *icsk = inet_csk(sk);
@@ -3331,8 +3331,7 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
 	if (level != SOL_TCP)
 		return icsk->icsk_af_ops->setsockopt(sk, level, optname,
 						     optval, optlen);
-	return do_tcp_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
-				 optlen);
+	return do_tcp_setsockopt(sk, level, optname, optval, optlen);
 }
 EXPORT_SYMBOL(tcp_setsockopt);
 
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 641303aa17d3dd..00b794a1035ce1 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2647,12 +2647,12 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 }
 EXPORT_SYMBOL(udp_lib_setsockopt);
 
-int udp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, unsigned int optlen)
+int udp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		   unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
 		return udp_lib_setsockopt(sk, level, optname,
-					  USER_SOCKPTR(optval), optlen,
+					  optval, optlen,
 					  udp_push_pending_frames);
 	return ip_setsockopt(sk, level, optname, optval, optlen);
 }
diff --git a/net/ipv4/udp_impl.h b/net/ipv4/udp_impl.h
index ab313702c87f30..2878d8285cafe7 100644
--- a/net/ipv4/udp_impl.h
+++ b/net/ipv4/udp_impl.h
@@ -12,8 +12,8 @@ int __udp4_lib_err(struct sk_buff *, u32, struct udp_table *);
 int udp_v4_get_port(struct sock *sk, unsigned short snum);
 void udp_v4_rehash(struct sock *sk);
 
-int udp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, unsigned int optlen);
+int udp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		   unsigned int optlen);
 int udp_getsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, int __user *optlen);
 
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index dcd000a5a9b124..d2282f5c9760f9 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -980,8 +980,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	return -EINVAL;
 }
 
-int ipv6_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen)
+int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		    unsigned int optlen)
 {
 	int err;
 
@@ -991,14 +991,12 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	err = do_ipv6_setsockopt(sk, level, optname, USER_SOCKPTR(optval),
-				 optlen);
+	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 			optname != IPV6_XFRM_POLICY)
-		err = nf_setsockopt(sk, PF_INET6, optname, USER_SOCKPTR(optval),
-				    optlen);
+		err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 #endif
 	return err;
 }
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 594e01ad670aa6..874f01cd7aec42 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -972,13 +972,13 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 }
 
 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
-			       char __user *optval, int optlen)
+			       sockptr_t optval, int optlen)
 {
 	switch (optname) {
 	case ICMPV6_FILTER:
 		if (optlen > sizeof(struct icmp6_filter))
 			optlen = sizeof(struct icmp6_filter);
-		if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
+		if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
 			return -EFAULT;
 		return 0;
 	default:
@@ -1015,12 +1015,12 @@ static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
 
 
 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct raw6_sock *rp = raw6_sk(sk);
 	int val;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	switch (optname) {
@@ -1062,7 +1062,7 @@ static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
 }
 
 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			    sockptr_t optval, unsigned int optlen)
 {
 	switch (level) {
 	case SOL_RAW:
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 05353b31fa07bc..85238620541c3e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1561,12 +1561,12 @@ void udpv6_destroy_sock(struct sock *sk)
 /*
  *	Socket option code for UDP
  */
-int udpv6_setsockopt(struct sock *sk, int level, int optname,
-		     char __user *optval, unsigned int optlen)
+int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		     unsigned int optlen)
 {
 	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
 		return udp_lib_setsockopt(sk, level, optname,
-					  USER_SOCKPTR(optval), optlen,
+					  optval, optlen,
 					  udp_v6_push_pending_frames);
 	return ipv6_setsockopt(sk, level, optname, optval, optlen);
 }
diff --git a/net/ipv6/udp_impl.h b/net/ipv6/udp_impl.h
index 30dfb6f1b7622a..b2fcc46c1630e0 100644
--- a/net/ipv6/udp_impl.h
+++ b/net/ipv6/udp_impl.h
@@ -17,8 +17,8 @@ void udp_v6_rehash(struct sock *sk);
 
 int udpv6_getsockopt(struct sock *sk, int level, int optname,
 		     char __user *optval, int __user *optlen);
-int udpv6_setsockopt(struct sock *sk, int level, int optname,
-		     char __user *optval, unsigned int optlen);
+int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		     unsigned int optlen);
 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
 		  int flags, int *addr_len);
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index ee0add15497d96..6ee9851ac7c680 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1494,7 +1494,7 @@ static int iucv_sock_release(struct socket *sock)
 
 /* getsockopt and setsockopt */
 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
-				char __user *optval, unsigned int optlen)
+				sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct iucv_sock *iucv = iucv_sk(sk);
@@ -1507,7 +1507,7 @@ static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *) optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	rc = 0;
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 56fac24a627a54..56dad9565bc93b 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1265,7 +1265,7 @@ static void kcm_recv_enable(struct kcm_sock *kcm)
 }
 
 static int kcm_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct kcm_sock *kcm = kcm_sk(sock->sk);
 	int val, valbool;
@@ -1277,8 +1277,8 @@ static int kcm_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
-		return -EINVAL;
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
+		return -EFAULT;
 
 	valbool = val ? 1 : 0;
 
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index c54cb59593ef81..c8842b2317409a 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -1244,7 +1244,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
  * session or the special tunnel type.
  */
 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct l2tp_session *session;
@@ -1258,7 +1258,7 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	err = -ENOTCONN;
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 6140a3e46c26f1..7180979114e494 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -1053,7 +1053,7 @@ static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
  *	Set various connection specific parameters.
  */
 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
-			     char __user *optval, unsigned int optlen)
+			     sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct llc_sock *llc = llc_sk(sk);
@@ -1063,7 +1063,7 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
 	lock_sock(sk);
 	if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
 		goto out;
-	rc = get_user(opt, (int __user *)optval);
+	rc = copy_from_sockptr(&opt, optval, sizeof(opt));
 	if (rc)
 		goto out;
 	rc = -EINVAL;
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 27b6f250b87dfd..30a8e697b9db9c 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1627,7 +1627,7 @@ static void mptcp_destroy(struct sock *sk)
 }
 
 static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
-				       char __user *optval, unsigned int optlen)
+				       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = (struct sock *)msk;
 	struct socket *ssock;
@@ -1643,8 +1643,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 			return -EINVAL;
 		}
 
-		ret = sock_setsockopt(ssock, SOL_SOCKET, optname,
-				      USER_SOCKPTR(optval), optlen);
+		ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval,
+				      optlen);
 		if (ret == 0) {
 			if (optname == SO_REUSEPORT)
 				sk->sk_reuseport = ssock->sk->sk_reuseport;
@@ -1655,12 +1655,12 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 		return ret;
 	}
 
-	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
-			       USER_SOCKPTR(optval), optlen);
+	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval,
+			       optlen);
 }
 
 static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = (struct sock *)msk;
 	int ret = -EOPNOTSUPP;
@@ -1687,7 +1687,7 @@ static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
 }
 
 static int mptcp_setsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, unsigned int optlen)
+			    sockptr_t optval, unsigned int optlen)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	struct sock *ssk;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 4f2c3b14ddbfa3..1d9750068cd65b 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1620,7 +1620,7 @@ static void netlink_update_socket_mc(struct netlink_sock *nlk,
 }
 
 static int netlink_setsockopt(struct socket *sock, int level, int optname,
-			      char __user *optval, unsigned int optlen)
+			      sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct netlink_sock *nlk = nlk_sk(sk);
@@ -1631,7 +1631,7 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
 		return -ENOPROTOOPT;
 
 	if (optlen >= sizeof(int) &&
-	    get_user(val, (unsigned int __user *)optval))
+	    copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	switch (optname) {
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index f90ef6934b8f4d..6d16e1ab1a8aba 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -294,7 +294,7 @@ void nr_destroy_socket(struct sock *sk)
  */
 
 static int nr_setsockopt(struct socket *sock, int level, int optname,
-	char __user *optval, unsigned int optlen)
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct nr_sock *nr = nr_sk(sk);
@@ -306,7 +306,7 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(unsigned int))
 		return -EINVAL;
 
-	if (get_user(opt, (unsigned int __user *)optval))
+	if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
 		return -EFAULT;
 
 	switch (optname) {
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 6da1e2334bb697..d257ed3b732ae3 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -218,7 +218,7 @@ static int llcp_sock_listen(struct socket *sock, int backlog)
 }
 
 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, unsigned int optlen)
+			       sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
@@ -241,7 +241,7 @@ static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
@@ -263,7 +263,7 @@ static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (get_user(opt, (u32 __user *) optval)) {
+		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 			err = -EFAULT;
 			break;
 		}
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index d8d4f78f78e451..0b8160d1a6e06d 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1558,7 +1558,7 @@ static int fanout_set_data_cbpf(struct packet_sock *po, sockptr_t data,
 	return 0;
 }
 
-static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
+static int fanout_set_data_ebpf(struct packet_sock *po, sockptr_t data,
 				unsigned int len)
 {
 	struct bpf_prog *new;
@@ -1568,7 +1568,7 @@ static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
 		return -EPERM;
 	if (len != sizeof(fd))
 		return -EINVAL;
-	if (copy_from_user(&fd, data, len))
+	if (copy_from_sockptr(&fd, data, len))
 		return -EFAULT;
 
 	new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
@@ -1579,12 +1579,12 @@ static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
 	return 0;
 }
 
-static int fanout_set_data(struct packet_sock *po, char __user *data,
+static int fanout_set_data(struct packet_sock *po, sockptr_t data,
 			   unsigned int len)
 {
 	switch (po->fanout->type) {
 	case PACKET_FANOUT_CBPF:
-		return fanout_set_data_cbpf(po, USER_SOCKPTR(data), len);
+		return fanout_set_data_cbpf(po, data, len);
 	case PACKET_FANOUT_EBPF:
 		return fanout_set_data_ebpf(po, data, len);
 	default:
@@ -3652,7 +3652,8 @@ static void packet_flush_mclist(struct sock *sk)
 }
 
 static int
-packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
+packet_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval,
+		  unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct packet_sock *po = pkt_sk(sk);
@@ -3672,7 +3673,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 			return -EINVAL;
 		if (len > sizeof(mreq))
 			len = sizeof(mreq);
-		if (copy_from_user(&mreq, optval, len))
+		if (copy_from_sockptr(&mreq, optval, len))
 			return -EFAULT;
 		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
 			return -EINVAL;
@@ -3703,7 +3704,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 		if (optlen < len) {
 			ret = -EINVAL;
 		} else {
-			if (copy_from_user(&req_u.req, optval, len))
+			if (copy_from_sockptr(&req_u.req, optval, len))
 				ret = -EFAULT;
 			else
 				ret = packet_set_ring(sk, &req_u, 0,
@@ -3718,7 +3719,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		pkt_sk(sk)->copy_thresh = val;
@@ -3730,7 +3731,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 		switch (val) {
 		case TPACKET_V1:
@@ -3756,7 +3757,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 		if (val > INT_MAX)
 			return -EINVAL;
@@ -3776,7 +3777,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		lock_sock(sk);
@@ -3795,7 +3796,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen < sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		lock_sock(sk);
@@ -3809,7 +3810,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen < sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		lock_sock(sk);
@@ -3825,7 +3826,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 			return -EINVAL;
 		if (optlen < sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		lock_sock(sk);
@@ -3844,7 +3845,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		po->tp_tstamp = val;
@@ -3856,7 +3857,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		return fanout_add(sk, val & 0xffff, val >> 16);
@@ -3874,7 +3875,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 		if (val < 0 || val > 1)
 			return -EINVAL;
@@ -3888,7 +3889,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		lock_sock(sk);
@@ -3907,7 +3908,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (copy_from_user(&val, optval, sizeof(val)))
+		if (copy_from_sockptr(&val, optval, sizeof(val)))
 			return -EFAULT;
 
 		po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 4577e43cb77782..e47d09aca4af46 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -975,7 +975,7 @@ static int pep_init(struct sock *sk)
 }
 
 static int pep_setsockopt(struct sock *sk, int level, int optname,
-				char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct pep_sock *pn = pep_sk(sk);
 	int val = 0, err = 0;
@@ -983,7 +983,7 @@ static int pep_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_PNPIPE)
 		return -ENOPROTOOPT;
 	if (optlen >= sizeof(int)) {
-		if (get_user(val, (int __user *) optval))
+		if (copy_from_sockptr(&val, optval, sizeof(int)))
 			return -EFAULT;
 	}
 
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index 1a5bf3fa4578b8..b239120dd9ca69 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -290,8 +290,7 @@ static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	return 0;
 }
 
-static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
-			      int len)
+static int rds_cancel_sent_to(struct rds_sock *rs, sockptr_t optval, int len)
 {
 	struct sockaddr_in6 sin6;
 	struct sockaddr_in sin;
@@ -308,14 +307,15 @@ static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
 		goto out;
 	} else if (len < sizeof(struct sockaddr_in6)) {
 		/* Assume IPv4 */
-		if (copy_from_user(&sin, optval, sizeof(struct sockaddr_in))) {
+		if (copy_from_sockptr(&sin, optval,
+				sizeof(struct sockaddr_in))) {
 			ret = -EFAULT;
 			goto out;
 		}
 		ipv6_addr_set_v4mapped(sin.sin_addr.s_addr, &sin6.sin6_addr);
 		sin6.sin6_port = sin.sin_port;
 	} else {
-		if (copy_from_user(&sin6, optval,
+		if (copy_from_sockptr(&sin6, optval,
 				   sizeof(struct sockaddr_in6))) {
 			ret = -EFAULT;
 			goto out;
@@ -327,21 +327,20 @@ static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
 	return ret;
 }
 
-static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
+static int rds_set_bool_option(unsigned char *optvar, sockptr_t optval,
 			       int optlen)
 {
 	int value;
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
-	if (get_user(value, (int __user *) optval))
+	if (copy_from_sockptr(&value, optval, sizeof(int)))
 		return -EFAULT;
 	*optvar = !!value;
 	return 0;
 }
 
-static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
-			    int optlen)
+static int rds_cong_monitor(struct rds_sock *rs, sockptr_t optval, int optlen)
 {
 	int ret;
 
@@ -358,8 +357,7 @@ static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
 	return ret;
 }
 
-static int rds_set_transport(struct rds_sock *rs, char __user *optval,
-			     int optlen)
+static int rds_set_transport(struct rds_sock *rs, sockptr_t optval, int optlen)
 {
 	int t_type;
 
@@ -369,7 +367,7 @@ static int rds_set_transport(struct rds_sock *rs, char __user *optval,
 	if (optlen != sizeof(int))
 		return -EINVAL;
 
-	if (copy_from_user(&t_type, (int __user *)optval, sizeof(t_type)))
+	if (copy_from_sockptr(&t_type, optval, sizeof(t_type)))
 		return -EFAULT;
 
 	if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
@@ -380,7 +378,7 @@ static int rds_set_transport(struct rds_sock *rs, char __user *optval,
 	return rs->rs_transport ? 0 : -ENOPROTOOPT;
 }
 
-static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
+static int rds_enable_recvtstamp(struct sock *sk, sockptr_t optval,
 				 int optlen, int optname)
 {
 	int val, valbool;
@@ -388,7 +386,7 @@ static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
 	if (optlen != sizeof(int))
 		return -EFAULT;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -404,7 +402,7 @@ static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
 	return 0;
 }
 
-static int rds_recv_track_latency(struct rds_sock *rs, char __user *optval,
+static int rds_recv_track_latency(struct rds_sock *rs, sockptr_t optval,
 				  int optlen)
 {
 	struct rds_rx_trace_so trace;
@@ -413,7 +411,7 @@ static int rds_recv_track_latency(struct rds_sock *rs, char __user *optval,
 	if (optlen != sizeof(struct rds_rx_trace_so))
 		return -EFAULT;
 
-	if (copy_from_user(&trace, optval, sizeof(trace)))
+	if (copy_from_sockptr(&trace, optval, sizeof(trace)))
 		return -EFAULT;
 
 	if (trace.rx_traces > RDS_MSG_RX_DGRAM_TRACE_MAX)
@@ -432,7 +430,7 @@ static int rds_recv_track_latency(struct rds_sock *rs, char __user *optval,
 }
 
 static int rds_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
 	int ret;
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index a7ae11846cd7f5..ccdd304eae0a0a 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -353,21 +353,20 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
 	return ret;
 }
 
-int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen)
+int rds_get_mr(struct rds_sock *rs, sockptr_t optval, int optlen)
 {
 	struct rds_get_mr_args args;
 
 	if (optlen != sizeof(struct rds_get_mr_args))
 		return -EINVAL;
 
-	if (copy_from_user(&args, (struct rds_get_mr_args __user *)optval,
-			   sizeof(struct rds_get_mr_args)))
+	if (copy_from_sockptr(&args, optval, sizeof(struct rds_get_mr_args)))
 		return -EFAULT;
 
 	return __rds_rdma_map(rs, &args, NULL, NULL, NULL);
 }
 
-int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
+int rds_get_mr_for_dest(struct rds_sock *rs, sockptr_t optval, int optlen)
 {
 	struct rds_get_mr_for_dest_args args;
 	struct rds_get_mr_args new_args;
@@ -375,7 +374,7 @@ int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
 	if (optlen != sizeof(struct rds_get_mr_for_dest_args))
 		return -EINVAL;
 
-	if (copy_from_user(&args, (struct rds_get_mr_for_dest_args __user *)optval,
+	if (copy_from_sockptr(&args, optval,
 			   sizeof(struct rds_get_mr_for_dest_args)))
 		return -EFAULT;
 
@@ -394,7 +393,7 @@ int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
 /*
  * Free the MR indicated by the given R_Key
  */
-int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen)
+int rds_free_mr(struct rds_sock *rs, sockptr_t optval, int optlen)
 {
 	struct rds_free_mr_args args;
 	struct rds_mr *mr;
@@ -403,8 +402,7 @@ int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen)
 	if (optlen != sizeof(struct rds_free_mr_args))
 		return -EINVAL;
 
-	if (copy_from_user(&args, (struct rds_free_mr_args __user *)optval,
-			   sizeof(struct rds_free_mr_args)))
+	if (copy_from_sockptr(&args, optval, sizeof(struct rds_free_mr_args)))
 		return -EFAULT;
 
 	/* Special case - a null cookie means flush all unused MRs */
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 106e862996b94d..d35d1fc3980766 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -924,9 +924,9 @@ int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
 
 /* rdma.c */
 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
-int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
-int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
-int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
+int rds_get_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
+int rds_get_mr_for_dest(struct rds_sock *rs, sockptr_t optval, int optlen);
+int rds_free_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
 void rds_rdma_drop_keys(struct rds_sock *rs);
 int rds_rdma_extra_size(struct rds_rdma_args *args,
 			struct rds_iov_vector *iov);
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index ce85656ac9c159..cf7d974e0f619a 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -365,7 +365,7 @@ void rose_destroy_socket(struct sock *sk)
  */
 
 static int rose_setsockopt(struct socket *sock, int level, int optname,
-	char __user *optval, unsigned int optlen)
+		sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct rose_sock *rose = rose_sk(sk);
@@ -377,7 +377,7 @@ static int rose_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(opt, (int __user *)optval))
+	if (copy_from_sockptr(&opt, optval, sizeof(int)))
 		return -EFAULT;
 
 	switch (optname) {
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index cd7d0d204c7498..e6725a6de015fb 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -588,7 +588,7 @@ EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
  * set RxRPC socket options
  */
 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
-			    char __user *optval, unsigned int optlen)
+			    sockptr_t optval, unsigned int optlen)
 {
 	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 	unsigned int min_sec_level;
@@ -639,8 +639,8 @@ static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 			ret = -EISCONN;
 			if (rx->sk.sk_state != RXRPC_UNBOUND)
 				goto error;
-			ret = get_user(min_sec_level,
-				       (unsigned int __user *) optval);
+			ret = copy_from_sockptr(&min_sec_level, optval,
+				       sizeof(unsigned int));
 			if (ret < 0)
 				goto error;
 			ret = -EINVAL;
@@ -658,7 +658,7 @@ static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 			if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
 				goto error;
 			ret = -EFAULT;
-			if (copy_from_user(service_upgrade, optval,
+			if (copy_from_sockptr(service_upgrade, optval,
 					   sizeof(service_upgrade)) != 0)
 				goto error;
 			ret = -EINVAL;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 9a2139ebd67d73..6d29a3603a3e6e 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -909,8 +909,8 @@ extern const struct rxrpc_security rxrpc_no_security;
 extern struct key_type key_type_rxrpc;
 extern struct key_type key_type_rxrpc_s;
 
-int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
-int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
+int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
+int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 			      u32);
 
diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c
index 0c98313dd7a8cb..94c3df392651b9 100644
--- a/net/rxrpc/key.c
+++ b/net/rxrpc/key.c
@@ -896,7 +896,7 @@ static void rxrpc_describe(const struct key *key, struct seq_file *m)
 /*
  * grab the security key for a socket
  */
-int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
+int rxrpc_request_key(struct rxrpc_sock *rx, sockptr_t optval, int optlen)
 {
 	struct key *key;
 	char *description;
@@ -906,7 +906,7 @@ int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
 	if (optlen <= 0 || optlen > PAGE_SIZE - 1)
 		return -EINVAL;
 
-	description = memdup_user_nul(optval, optlen);
+	description = memdup_sockptr_nul(optval, optlen);
 	if (IS_ERR(description))
 		return PTR_ERR(description);
 
@@ -926,8 +926,7 @@ int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
 /*
  * grab the security keyring for a server socket
  */
-int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
-			 int optlen)
+int rxrpc_server_keyring(struct rxrpc_sock *rx, sockptr_t optval, int optlen)
 {
 	struct key *key;
 	char *description;
@@ -937,7 +936,7 @@ int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
 	if (optlen <= 0 || optlen > PAGE_SIZE - 1)
 		return -EINVAL;
 
-	description = memdup_user_nul(optval, optlen);
+	description = memdup_sockptr_nul(optval, optlen);
 	if (IS_ERR(description))
 		return PTR_ERR(description);
 
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9a767f35971865..144808dfea9ee8 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4429,7 +4429,7 @@ static int sctp_setsockopt_pf_expose(struct sock *sk,
  *   optlen  - the size of the buffer.
  */
 static int sctp_setsockopt(struct sock *sk, int level, int optname,
-			   char __user *optval, unsigned int optlen)
+			   sockptr_t optval, unsigned int optlen)
 {
 	void *kopt = NULL;
 	int retval = 0;
@@ -4449,7 +4449,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 	}
 
 	if (optlen > 0) {
-		kopt = memdup_user(optval, optlen);
+		kopt = memdup_sockptr(optval, optlen);
 		if (IS_ERR(kopt))
 			return PTR_ERR(kopt);
 	}
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 9711c9e0e515bf..4ac1d4de667691 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1731,7 +1731,7 @@ static int smc_shutdown(struct socket *sock, int how)
 }
 
 static int smc_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct smc_sock *smc;
@@ -1754,7 +1754,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(int)))
 		return -EFAULT;
 
 	lock_sock(sk);
diff --git a/net/socket.c b/net/socket.c
index c97f83d879ae75..e44b8ac47f6f46 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2094,10 +2094,10 @@ static bool sock_use_custom_sol_socket(const struct socket *sock)
  *	Set a socket option. Because we don't know the option lengths we have
  *	to pass the user mode parameter for the protocols to sort out.
  */
-int __sys_setsockopt(int fd, int level, int optname, char __user *optval,
+int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
 		int optlen)
 {
-	mm_segment_t oldfs = get_fs();
+	sockptr_t optval = USER_SOCKPTR(user_optval);
 	char *kernel_optval = NULL;
 	int err, fput_needed;
 	struct socket *sock;
@@ -2115,7 +2115,7 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *optval,
 
 	if (!in_compat_syscall())
 		err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
-						     optval, &optlen,
+						     user_optval, &optlen,
 						     &kernel_optval);
 	if (err < 0)
 		goto out_put;
@@ -2124,25 +2124,16 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *optval,
 		goto out_put;
 	}
 
-	if (kernel_optval) {
-		set_fs(KERNEL_DS);
-		optval = (char __user __force *)kernel_optval;
-	}
-
+	if (kernel_optval)
+		optval = KERNEL_SOCKPTR(kernel_optval);
 	if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
-		err = sock_setsockopt(sock, level, optname,
-				      USER_SOCKPTR(optval), optlen);
+		err = sock_setsockopt(sock, level, optname, optval, optlen);
 	else if (unlikely(!sock->ops->setsockopt))
 		err = -EOPNOTSUPP;
 	else
 		err = sock->ops->setsockopt(sock, level, optname, optval,
 					    optlen);
-
-	if (kernel_optval) {
-		set_fs(oldfs);
-		kfree(kernel_optval);
-	}
-
+	kfree(kernel_optval);
 out_put:
 	fput_light(sock->file, fput_needed);
 	return err;
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index fc388cef64715c..07419f36116a84 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -3103,7 +3103,7 @@ static int tipc_sk_leave(struct tipc_sock *tsk)
  * Returns 0 on success, errno otherwise
  */
 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
-			   char __user *ov, unsigned int ol)
+			   sockptr_t ov, unsigned int ol)
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
@@ -3124,17 +3124,17 @@ static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
 	case TIPC_NODELAY:
 		if (ol < sizeof(value))
 			return -EINVAL;
-		if (get_user(value, (u32 __user *)ov))
+		if (copy_from_sockptr(&value, ov, sizeof(u32)))
 			return -EFAULT;
 		break;
 	case TIPC_GROUP_JOIN:
 		if (ol < sizeof(mreq))
 			return -EINVAL;
-		if (copy_from_user(&mreq, ov, sizeof(mreq)))
+		if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
 			return -EFAULT;
 		break;
 	default:
-		if (ov || ol)
+		if (!sockptr_is_null(ov) || ol)
 			return -EINVAL;
 	}
 
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index ec10041c6b7d41..d77f7d821130db 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -450,7 +450,7 @@ static int tls_getsockopt(struct sock *sk, int level, int optname,
 	return do_tls_getsockopt(sk, optname, optval, optlen);
 }
 
-static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
+static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 				  unsigned int optlen, int tx)
 {
 	struct tls_crypto_info *crypto_info;
@@ -460,7 +460,7 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 	int rc = 0;
 	int conf;
 
-	if (!optval || (optlen < sizeof(*crypto_info))) {
+	if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) {
 		rc = -EINVAL;
 		goto out;
 	}
@@ -479,7 +479,7 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 		goto out;
 	}
 
-	rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
+	rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 	if (rc) {
 		rc = -EFAULT;
 		goto err_crypto_info;
@@ -522,8 +522,9 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 		goto err_crypto_info;
 	}
 
-	rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
-			    optlen - sizeof(*crypto_info));
+	sockptr_advance(optval, sizeof(*crypto_info));
+	rc = copy_from_sockptr(crypto_info + 1, optval,
+			       optlen - sizeof(*crypto_info));
 	if (rc) {
 		rc = -EFAULT;
 		goto err_crypto_info;
@@ -579,8 +580,8 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 	return rc;
 }
 
-static int do_tls_setsockopt(struct sock *sk, int optname,
-			     char __user *optval, unsigned int optlen)
+static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
+			     unsigned int optlen)
 {
 	int rc = 0;
 
@@ -600,7 +601,7 @@ static int do_tls_setsockopt(struct sock *sk, int optname,
 }
 
 static int tls_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
 
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index df204c6761c453..27bbcfad9c1738 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1517,7 +1517,7 @@ static void vsock_update_buffer_size(struct vsock_sock *vsk,
 static int vsock_stream_setsockopt(struct socket *sock,
 				   int level,
 				   int optname,
-				   char __user *optval,
+				   sockptr_t optval,
 				   unsigned int optlen)
 {
 	int err;
@@ -1535,7 +1535,7 @@ static int vsock_stream_setsockopt(struct socket *sock,
 			err = -EINVAL;			  \
 			goto exit;			  \
 		}					  \
-		if (copy_from_user(&_v, optval, sizeof(_v)) != 0) {	\
+		if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) {	\
 			err = -EFAULT;					\
 			goto exit;					\
 		}							\
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index d5b09bbff3754f..0bbb283f23c96f 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -431,7 +431,7 @@ void x25_destroy_socket_from_timer(struct sock *sk)
  */
 
 static int x25_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	int opt;
 	struct sock *sk = sock->sk;
@@ -445,7 +445,7 @@ static int x25_setsockopt(struct socket *sock, int level, int optname,
 		goto out;
 
 	rc = -EFAULT;
-	if (get_user(opt, (int __user *)optval))
+	if (copy_from_sockptr(&opt, optval, sizeof(int)))
 		goto out;
 
 	if (opt)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 26e3bba8c204a7..2e94a7e94671b6 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -702,7 +702,7 @@ struct xdp_umem_reg_v1 {
 };
 
 static int xsk_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, unsigned int optlen)
+			  sockptr_t optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct xdp_sock *xs = xdp_sk(sk);
@@ -720,7 +720,7 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
 
 		if (optlen < sizeof(entries))
 			return -EINVAL;
-		if (copy_from_user(&entries, optval, sizeof(entries)))
+		if (copy_from_sockptr(&entries, optval, sizeof(entries)))
 			return -EFAULT;
 
 		mutex_lock(&xs->mutex);
@@ -747,7 +747,7 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
 		else if (optlen < sizeof(mr))
 			mr_size = sizeof(struct xdp_umem_reg_v1);
 
-		if (copy_from_user(&mr, optval, mr_size))
+		if (copy_from_sockptr(&mr, optval, mr_size))
 			return -EFAULT;
 
 		mutex_lock(&xs->mutex);
@@ -774,7 +774,7 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
 		struct xsk_queue **q;
 		int entries;
 
-		if (copy_from_user(&entries, optval, sizeof(entries)))
+		if (copy_from_sockptr(&entries, optval, sizeof(entries)))
 			return -EFAULT;
 
 		mutex_lock(&xs->mutex);
-- 
2.27.0


^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 24/24] net: pass a sockptr_t into ->setsockopt
  2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
@ 2020-07-20 14:19   ` Stefan Schmidt
  2020-07-20 23:20     ` David Miller
  2020-07-22  8:26   ` [MPTCP] " Matthieu Baerts
  1 sibling, 1 reply; 50+ messages in thread
From: Stefan Schmidt @ 2020-07-20 14:19 UTC (permalink / raw)
  To: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

Hello.

On 20.07.20 14:47, Christoph Hellwig wrote:
> Rework the remaining setsockopt code to pass a sockptr_t instead of a
> plain user pointer.  This removes the last remaining set_fs(KERNEL_DS)
> outside of architecture specific code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   crypto/af_alg.c                           |  7 ++--
>   drivers/crypto/chelsio/chtls/chtls_main.c | 18 ++++++-----
>   drivers/isdn/mISDN/socket.c               |  4 +--
>   include/linux/net.h                       |  4 ++-
>   include/net/inet_connection_sock.h        |  3 +-
>   include/net/ip.h                          |  2 +-
>   include/net/ipv6.h                        |  4 +--
>   include/net/sctp/structs.h                |  2 +-
>   include/net/sock.h                        |  4 +--
>   include/net/tcp.h                         |  4 +--
>   net/atm/common.c                          |  6 ++--
>   net/atm/common.h                          |  2 +-
>   net/atm/pvc.c                             |  2 +-
>   net/atm/svc.c                             |  6 ++--
>   net/ax25/af_ax25.c                        |  6 ++--
>   net/bluetooth/hci_sock.c                  |  8 ++---
>   net/bluetooth/l2cap_sock.c                | 22 ++++++-------
>   net/bluetooth/rfcomm/sock.c               | 12 ++++---
>   net/bluetooth/sco.c                       |  6 ++--
>   net/caif/caif_socket.c                    |  8 ++---
>   net/can/j1939/socket.c                    | 12 +++----
>   net/can/raw.c                             | 16 +++++-----
>   net/core/sock.c                           |  2 +-
>   net/dccp/dccp.h                           |  2 +-
>   net/dccp/proto.c                          | 20 ++++++------
>   net/decnet/af_decnet.c                    | 16 ++++++----
>   net/ieee802154/socket.c                   |  6 ++--
>   net/ipv4/ip_sockglue.c                    | 13 +++-----
>   net/ipv4/raw.c                            |  8 ++---
>   net/ipv4/tcp.c                            |  5 ++-
>   net/ipv4/udp.c                            |  6 ++--
>   net/ipv4/udp_impl.h                       |  4 +--
>   net/ipv6/ipv6_sockglue.c                  | 10 +++---
>   net/ipv6/raw.c                            | 10 +++---
>   net/ipv6/udp.c                            |  6 ++--
>   net/ipv6/udp_impl.h                       |  4 +--
>   net/iucv/af_iucv.c                        |  4 +--
>   net/kcm/kcmsock.c                         |  6 ++--
>   net/l2tp/l2tp_ppp.c                       |  4 +--
>   net/llc/af_llc.c                          |  4 +--
>   net/mptcp/protocol.c                      | 14 ++++----
>   net/netlink/af_netlink.c                  |  4 +--
>   net/netrom/af_netrom.c                    |  4 +--
>   net/nfc/llcp_sock.c                       |  6 ++--
>   net/packet/af_packet.c                    | 39 ++++++++++++-----------
>   net/phonet/pep.c                          |  4 +--
>   net/rds/af_rds.c                          | 30 ++++++++---------
>   net/rds/rdma.c                            | 14 ++++----
>   net/rds/rds.h                             |  6 ++--
>   net/rose/af_rose.c                        |  4 +--
>   net/rxrpc/af_rxrpc.c                      |  8 ++---
>   net/rxrpc/ar-internal.h                   |  4 +--
>   net/rxrpc/key.c                           |  9 +++---
>   net/sctp/socket.c                         |  4 +--
>   net/smc/af_smc.c                          |  4 +--
>   net/socket.c                              | 23 ++++---------
>   net/tipc/socket.c                         |  8 ++---
>   net/tls/tls_main.c                        | 17 +++++-----
>   net/vmw_vsock/af_vsock.c                  |  4 +--
>   net/x25/af_x25.c                          |  4 +--
>   net/xdp/xsk.c                             |  8 ++---
>   61 files changed, 248 insertions(+), 258 deletions(-)
> 
> diff --git a/crypto/af_alg.c b/crypto/af_alg.c
> index 29f71428520b4b..892242a42c3ec9 100644
> --- a/crypto/af_alg.c
> +++ b/crypto/af_alg.c
> @@ -197,8 +197,7 @@ static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
>   	return err;
>   }
>   
> -static int alg_setkey(struct sock *sk, char __user *ukey,
> -		      unsigned int keylen)
> +static int alg_setkey(struct sock *sk, sockptr_t ukey, unsigned int keylen)
>   {
>   	struct alg_sock *ask = alg_sk(sk);
>   	const struct af_alg_type *type = ask->type;
> @@ -210,7 +209,7 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
>   		return -ENOMEM;
>   
>   	err = -EFAULT;
> -	if (copy_from_user(key, ukey, keylen))
> +	if (copy_from_sockptr(key, ukey, keylen))
>   		goto out;
>   
>   	err = type->setkey(ask->private, key, keylen);
> @@ -222,7 +221,7 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
>   }
>   
>   static int alg_setsockopt(struct socket *sock, int level, int optname,
> -			  char __user *optval, unsigned int optlen)
> +			  sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct alg_sock *ask = alg_sk(sk);
> diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c
> index d98b89d0fa6eeb..c3058dcdb33c5c 100644
> --- a/drivers/crypto/chelsio/chtls/chtls_main.c
> +++ b/drivers/crypto/chelsio/chtls/chtls_main.c
> @@ -488,7 +488,7 @@ static int chtls_getsockopt(struct sock *sk, int level, int optname,
>   }
>   
>   static int do_chtls_setsockopt(struct sock *sk, int optname,
> -			       char __user *optval, unsigned int optlen)
> +			       sockptr_t optval, unsigned int optlen)
>   {
>   	struct tls_crypto_info *crypto_info, tmp_crypto_info;
>   	struct chtls_sock *csk;
> @@ -498,12 +498,12 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
>   
>   	csk = rcu_dereference_sk_user_data(sk);
>   
> -	if (!optval || optlen < sizeof(*crypto_info)) {
> +	if (sockptr_is_null(optval) || optlen < sizeof(*crypto_info)) {
>   		rc = -EINVAL;
>   		goto out;
>   	}
>   
> -	rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
> +	rc = copy_from_sockptr(&tmp_crypto_info, optval, sizeof(*crypto_info));
>   	if (rc) {
>   		rc = -EFAULT;
>   		goto out;
> @@ -525,8 +525,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
>   		/* Obtain version and type from previous copy */
>   		crypto_info[0] = tmp_crypto_info;
>   		/* Now copy the following data */
> -		rc = copy_from_user((char *)crypto_info + sizeof(*crypto_info),
> -				optval + sizeof(*crypto_info),
> +		sockptr_advance(optval, sizeof(*crypto_info));
> +		rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
> +				optval,
>   				sizeof(struct tls12_crypto_info_aes_gcm_128)
>   				- sizeof(*crypto_info));
>   
> @@ -541,8 +542,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
>   	}
>   	case TLS_CIPHER_AES_GCM_256: {
>   		crypto_info[0] = tmp_crypto_info;
> -		rc = copy_from_user((char *)crypto_info + sizeof(*crypto_info),
> -				    optval + sizeof(*crypto_info),
> +		sockptr_advance(optval, sizeof(*crypto_info));
> +		rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
> +				    optval,
>   				sizeof(struct tls12_crypto_info_aes_gcm_256)
>   				- sizeof(*crypto_info));
>   
> @@ -565,7 +567,7 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
>   }
>   
>   static int chtls_setsockopt(struct sock *sk, int level, int optname,
> -			    char __user *optval, unsigned int optlen)
> +			    sockptr_t optval, unsigned int optlen)
>   {
>   	struct tls_context *ctx = tls_get_ctx(sk);
>   
> diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
> index 1b2b91479107bc..2835daae9e9f3a 100644
> --- a/drivers/isdn/mISDN/socket.c
> +++ b/drivers/isdn/mISDN/socket.c
> @@ -401,7 +401,7 @@ data_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
>   }
>   
>   static int data_sock_setsockopt(struct socket *sock, int level, int optname,
> -				char __user *optval, unsigned int len)
> +				sockptr_t optval, unsigned int len)
>   {
>   	struct sock *sk = sock->sk;
>   	int err = 0, opt = 0;
> @@ -414,7 +414,7 @@ static int data_sock_setsockopt(struct socket *sock, int level, int optname,
>   
>   	switch (optname) {
>   	case MISDN_TIME_STAMP:
> -		if (get_user(opt, (int __user *)optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(int))) {
>   			err = -EFAULT;
>   			break;
>   		}
> diff --git a/include/linux/net.h b/include/linux/net.h
> index 858ff1d981540d..d48ff11808794c 100644
> --- a/include/linux/net.h
> +++ b/include/linux/net.h
> @@ -21,6 +21,7 @@
>   #include <linux/rcupdate.h>
>   #include <linux/once.h>
>   #include <linux/fs.h>
> +#include <linux/sockptr.h>
>   
>   #include <uapi/linux/net.h>
>   
> @@ -162,7 +163,8 @@ struct proto_ops {
>   	int		(*listen)    (struct socket *sock, int len);
>   	int		(*shutdown)  (struct socket *sock, int flags);
>   	int		(*setsockopt)(struct socket *sock, int level,
> -				      int optname, char __user *optval, unsigned int optlen);
> +				      int optname, sockptr_t optval,
> +				      unsigned int optlen);
>   	int		(*getsockopt)(struct socket *sock, int level,
>   				      int optname, char __user *optval, int __user *optlen);
>   	void		(*show_fdinfo)(struct seq_file *m, struct socket *sock);
> diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
> index 157c60cca0ca60..1e209ce7d1bd1b 100644
> --- a/include/net/inet_connection_sock.h
> +++ b/include/net/inet_connection_sock.h
> @@ -16,6 +16,7 @@
>   #include <linux/timer.h>
>   #include <linux/poll.h>
>   #include <linux/kernel.h>
> +#include <linux/sockptr.h>
>   
>   #include <net/inet_sock.h>
>   #include <net/request_sock.h>
> @@ -45,7 +46,7 @@ struct inet_connection_sock_af_ops {
>   	u16	    net_frag_header_len;
>   	u16	    sockaddr_len;
>   	int	    (*setsockopt)(struct sock *sk, int level, int optname,
> -				  char __user *optval, unsigned int optlen);
> +				  sockptr_t optval, unsigned int optlen);
>   	int	    (*getsockopt)(struct sock *sk, int level, int optname,
>   				  char __user *optval, int __user *optlen);
>   	void	    (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
> diff --git a/include/net/ip.h b/include/net/ip.h
> index d66ad3a9522081..b09c48d862cc10 100644
> --- a/include/net/ip.h
> +++ b/include/net/ip.h
> @@ -722,7 +722,7 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
>   			 struct sk_buff *skb, int tlen, int offset);
>   int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
>   		 struct ipcm_cookie *ipc, bool allow_ipv6);
> -int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
> +int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
>   		  unsigned int optlen);
>   int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
>   		  int __user *optlen);
> diff --git a/include/net/ipv6.h b/include/net/ipv6.h
> index 4c9d89b5d73268..bd1f396cc9c729 100644
> --- a/include/net/ipv6.h
> +++ b/include/net/ipv6.h
> @@ -1084,8 +1084,8 @@ struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
>    *	socket options (ipv6_sockglue.c)
>    */
>   
> -int ipv6_setsockopt(struct sock *sk, int level, int optname,
> -		    char __user *optval, unsigned int optlen);
> +int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
> +		    unsigned int optlen);
>   int ipv6_getsockopt(struct sock *sk, int level, int optname,
>   		    char __user *optval, int __user *optlen);
>   
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 233bbf7df5d66c..b33f1aefad0989 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -431,7 +431,7 @@ struct sctp_af {
>   	int		(*setsockopt)	(struct sock *sk,
>   					 int level,
>   					 int optname,
> -					 char __user *optval,
> +					 sockptr_t optval,
>   					 unsigned int optlen);
>   	int		(*getsockopt)	(struct sock *sk,
>   					 int level,
> diff --git a/include/net/sock.h b/include/net/sock.h
> index bfb2fe2fc36876..2cc3ba667908de 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1141,7 +1141,7 @@ struct proto {
>   	void			(*destroy)(struct sock *sk);
>   	void			(*shutdown)(struct sock *sk, int how);
>   	int			(*setsockopt)(struct sock *sk, int level,
> -					int optname, char __user *optval,
> +					int optname, sockptr_t optval,
>   					unsigned int optlen);
>   	int			(*getsockopt)(struct sock *sk, int level,
>   					int optname, char __user *optval,
> @@ -1734,7 +1734,7 @@ int sock_common_getsockopt(struct socket *sock, int level, int optname,
>   int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
>   			int flags);
>   int sock_common_setsockopt(struct socket *sock, int level, int optname,
> -				  char __user *optval, unsigned int optlen);
> +			   sockptr_t optval, unsigned int optlen);
>   
>   void sk_common_release(struct sock *sk);
>   
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index e3c8e1d820214c..e0c35d56091f22 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -399,8 +399,8 @@ __poll_t tcp_poll(struct file *file, struct socket *sock,
>   		      struct poll_table_struct *wait);
>   int tcp_getsockopt(struct sock *sk, int level, int optname,
>   		   char __user *optval, int __user *optlen);
> -int tcp_setsockopt(struct sock *sk, int level, int optname,
> -		   char __user *optval, unsigned int optlen);
> +int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
> +		   unsigned int optlen);
>   void tcp_set_keepalive(struct sock *sk, int val);
>   void tcp_syn_ack_timeout(const struct request_sock *req);
>   int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
> diff --git a/net/atm/common.c b/net/atm/common.c
> index 9b28f1fb3c69c8..84367b844b1473 100644
> --- a/net/atm/common.c
> +++ b/net/atm/common.c
> @@ -745,7 +745,7 @@ static int check_qos(const struct atm_qos *qos)
>   }
>   
>   int vcc_setsockopt(struct socket *sock, int level, int optname,
> -		   char __user *optval, unsigned int optlen)
> +		   sockptr_t optval, unsigned int optlen)
>   {
>   	struct atm_vcc *vcc;
>   	unsigned long value;
> @@ -760,7 +760,7 @@ int vcc_setsockopt(struct socket *sock, int level, int optname,
>   	{
>   		struct atm_qos qos;
>   
> -		if (copy_from_user(&qos, optval, sizeof(qos)))
> +		if (copy_from_sockptr(&qos, optval, sizeof(qos)))
>   			return -EFAULT;
>   		error = check_qos(&qos);
>   		if (error)
> @@ -774,7 +774,7 @@ int vcc_setsockopt(struct socket *sock, int level, int optname,
>   		return 0;
>   	}
>   	case SO_SETCLP:
> -		if (get_user(value, (unsigned long __user *)optval))
> +		if (copy_from_sockptr(&value, optval, sizeof(value)))
>   			return -EFAULT;
>   		if (value)
>   			vcc->atm_options |= ATM_ATMOPT_CLP;
> diff --git a/net/atm/common.h b/net/atm/common.h
> index 5850649068bb29..a1e56e8de698a3 100644
> --- a/net/atm/common.h
> +++ b/net/atm/common.h
> @@ -21,7 +21,7 @@ __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait);
>   int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
>   int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
>   int vcc_setsockopt(struct socket *sock, int level, int optname,
> -		   char __user *optval, unsigned int optlen);
> +		   sockptr_t optval, unsigned int optlen);
>   int vcc_getsockopt(struct socket *sock, int level, int optname,
>   		   char __user *optval, int __user *optlen);
>   void vcc_process_recv_queue(struct atm_vcc *vcc);
> diff --git a/net/atm/pvc.c b/net/atm/pvc.c
> index 02bd2a436bdf9e..53e7d3f39e26cc 100644
> --- a/net/atm/pvc.c
> +++ b/net/atm/pvc.c
> @@ -63,7 +63,7 @@ static int pvc_connect(struct socket *sock, struct sockaddr *sockaddr,
>   }
>   
>   static int pvc_setsockopt(struct socket *sock, int level, int optname,
> -			  char __user *optval, unsigned int optlen)
> +			  sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	int error;
> diff --git a/net/atm/svc.c b/net/atm/svc.c
> index ba144d035e3d41..4a02bcaad279f8 100644
> --- a/net/atm/svc.c
> +++ b/net/atm/svc.c
> @@ -451,7 +451,7 @@ int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
>   }
>   
>   static int svc_setsockopt(struct socket *sock, int level, int optname,
> -			  char __user *optval, unsigned int optlen)
> +			  sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct atm_vcc *vcc = ATM_SD(sock);
> @@ -464,7 +464,7 @@ static int svc_setsockopt(struct socket *sock, int level, int optname,
>   			error = -EINVAL;
>   			goto out;
>   		}
> -		if (copy_from_user(&vcc->sap, optval, optlen)) {
> +		if (copy_from_sockptr(&vcc->sap, optval, optlen)) {
>   			error = -EFAULT;
>   			goto out;
>   		}
> @@ -475,7 +475,7 @@ static int svc_setsockopt(struct socket *sock, int level, int optname,
>   			error = -EINVAL;
>   			goto out;
>   		}
> -		if (get_user(value, (int __user *)optval)) {
> +		if (copy_from_sockptr(&value, optval, sizeof(int))) {
>   			error = -EFAULT;
>   			goto out;
>   		}
> diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
> index fd91cd34f25e03..17bf31a8969284 100644
> --- a/net/ax25/af_ax25.c
> +++ b/net/ax25/af_ax25.c
> @@ -528,7 +528,7 @@ ax25_cb *ax25_create_cb(void)
>    */
>   
>   static int ax25_setsockopt(struct socket *sock, int level, int optname,
> -	char __user *optval, unsigned int optlen)
> +		sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	ax25_cb *ax25;
> @@ -543,7 +543,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
>   	if (optlen < sizeof(unsigned int))
>   		return -EINVAL;
>   
> -	if (get_user(opt, (unsigned int __user *)optval))
> +	if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
>   		return -EFAULT;
>   
>   	lock_sock(sk);
> @@ -640,7 +640,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
>   
>   		memset(devname, 0, sizeof(devname));
>   
> -		if (copy_from_user(devname, optval, optlen)) {
> +		if (copy_from_sockptr(devname, optval, optlen)) {
>   			res = -EFAULT;
>   			break;
>   		}
> diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
> index caf38a8ea6a8ba..d5eff27d5b1e17 100644
> --- a/net/bluetooth/hci_sock.c
> +++ b/net/bluetooth/hci_sock.c
> @@ -1842,7 +1842,7 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
>   }
>   
>   static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
> -			       char __user *optval, unsigned int len)
> +			       sockptr_t optval, unsigned int len)
>   {
>   	struct hci_ufilter uf = { .opcode = 0 };
>   	struct sock *sk = sock->sk;
> @@ -1862,7 +1862,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
>   
>   	switch (optname) {
>   	case HCI_DATA_DIR:
> -		if (get_user(opt, (int __user *)optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -1874,7 +1874,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
>   		break;
>   
>   	case HCI_TIME_STAMP:
> -		if (get_user(opt, (int __user *)optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -1896,7 +1896,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
>   		}
>   
>   		len = min_t(unsigned int, len, sizeof(uf));
> -		if (copy_from_user(&uf, optval, len)) {
> +		if (copy_from_sockptr(&uf, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
> index a995d2c51fa7f1..a3d104123f38dd 100644
> --- a/net/bluetooth/l2cap_sock.c
> +++ b/net/bluetooth/l2cap_sock.c
> @@ -703,7 +703,7 @@ static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
>   }
>   
>   static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
> -				     char __user *optval, unsigned int optlen)
> +				     sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
> @@ -736,7 +736,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
>   		opts.txwin_size = chan->tx_win;
>   
>   		len = min_t(unsigned int, sizeof(opts), optlen);
> -		if (copy_from_user((char *) &opts, optval, len)) {
> +		if (copy_from_sockptr(&opts, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -782,7 +782,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
>   		break;
>   
>   	case L2CAP_LM:
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -859,7 +859,7 @@ static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
>   }
>   
>   static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
> -				 char __user *optval, unsigned int optlen)
> +				 sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
> @@ -891,7 +891,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   		sec.level = BT_SECURITY_LOW;
>   
>   		len = min_t(unsigned int, sizeof(sec), optlen);
> -		if (copy_from_user((char *) &sec, optval, len)) {
> +		if (copy_from_sockptr(&sec, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -939,7 +939,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   			break;
>   		}
>   
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -954,7 +954,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   		break;
>   
>   	case BT_FLUSHABLE:
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -990,7 +990,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   		pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
>   
>   		len = min_t(unsigned int, sizeof(pwr), optlen);
> -		if (copy_from_user((char *) &pwr, optval, len)) {
> +		if (copy_from_sockptr(&pwr, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -1002,7 +1002,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   		break;
>   
>   	case BT_CHANNEL_POLICY:
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -1050,7 +1050,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   			break;
>   		}
>   
> -		if (get_user(opt, (u16 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -1081,7 +1081,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
>   			break;
>   		}
>   
> -		if (get_user(opt, (u8 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u8))) {
>   			err = -EFAULT;
>   			break;
>   		}
> diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
> index df14eebe80da8b..dba4ea0e1b0dc7 100644
> --- a/net/bluetooth/rfcomm/sock.c
> +++ b/net/bluetooth/rfcomm/sock.c
> @@ -644,7 +644,8 @@ static int rfcomm_sock_recvmsg(struct socket *sock, struct msghdr *msg,
>   	return len;
>   }
>   
> -static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
> +static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname,
> +		sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	int err = 0;
> @@ -656,7 +657,7 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __u
>   
>   	switch (optname) {
>   	case RFCOMM_LM:
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -685,7 +686,8 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __u
>   	return err;
>   }
>   
> -static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
> +static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
> +		sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct bt_security sec;
> @@ -713,7 +715,7 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
>   		sec.level = BT_SECURITY_LOW;
>   
>   		len = min_t(unsigned int, sizeof(sec), optlen);
> -		if (copy_from_user((char *) &sec, optval, len)) {
> +		if (copy_from_sockptr(&sec, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -732,7 +734,7 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
>   			break;
>   		}
>   
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
> index c8c3d38cdc7b56..37260baf71507b 100644
> --- a/net/bluetooth/sco.c
> +++ b/net/bluetooth/sco.c
> @@ -791,7 +791,7 @@ static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
>   }
>   
>   static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
> -			       char __user *optval, unsigned int optlen)
> +			       sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	int len, err = 0;
> @@ -810,7 +810,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
>   			break;
>   		}
>   
> -		if (get_user(opt, (u32 __user *) optval)) {
> +		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
>   			err = -EFAULT;
>   			break;
>   		}
> @@ -831,7 +831,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
>   		voice.setting = sco_pi(sk)->setting;
>   
>   		len = min_t(unsigned int, sizeof(voice), optlen);
> -		if (copy_from_user((char *)&voice, optval, len)) {
> +		if (copy_from_sockptr(&voice, optval, len)) {
>   			err = -EFAULT;
>   			break;
>   		}
> diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
> index b94ecd931002e7..3ad0a1df671283 100644
> --- a/net/caif/caif_socket.c
> +++ b/net/caif/caif_socket.c
> @@ -669,8 +669,8 @@ static int caif_stream_sendmsg(struct socket *sock, struct msghdr *msg,
>   	return sent ? : err;
>   }
>   
> -static int setsockopt(struct socket *sock,
> -		      int lvl, int opt, char __user *ov, unsigned int ol)
> +static int setsockopt(struct socket *sock, int lvl, int opt, sockptr_t ov,
> +		unsigned int ol)
>   {
>   	struct sock *sk = sock->sk;
>   	struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
> @@ -685,7 +685,7 @@ static int setsockopt(struct socket *sock,
>   			return -EINVAL;
>   		if (lvl != SOL_CAIF)
>   			goto bad_sol;
> -		if (copy_from_user(&linksel, ov, sizeof(int)))
> +		if (copy_from_sockptr(&linksel, ov, sizeof(int)))
>   			return -EINVAL;
>   		lock_sock(&(cf_sk->sk));
>   		cf_sk->conn_req.link_selector = linksel;
> @@ -699,7 +699,7 @@ static int setsockopt(struct socket *sock,
>   			return -ENOPROTOOPT;
>   		lock_sock(&(cf_sk->sk));
>   		if (ol > sizeof(cf_sk->conn_req.param.data) ||
> -			copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
> +		    copy_from_sockptr(&cf_sk->conn_req.param.data, ov, ol)) {
>   			release_sock(&cf_sk->sk);
>   			return -EINVAL;
>   		}
> diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
> index f7587428febdd2..78ff9b3f1d40c7 100644
> --- a/net/can/j1939/socket.c
> +++ b/net/can/j1939/socket.c
> @@ -627,14 +627,14 @@ static int j1939_sk_release(struct socket *sock)
>   	return 0;
>   }
>   
> -static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
> +static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, sockptr_t optval,
>   				    unsigned int optlen, int flag)
>   {
>   	int tmp;
>   
>   	if (optlen != sizeof(tmp))
>   		return -EINVAL;
> -	if (copy_from_user(&tmp, optval, optlen))
> +	if (copy_from_sockptr(&tmp, optval, optlen))
>   		return -EFAULT;
>   	lock_sock(&jsk->sk);
>   	if (tmp)
> @@ -646,7 +646,7 @@ static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
>   }
>   
>   static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
> -			       char __user *optval, unsigned int optlen)
> +			       sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct j1939_sock *jsk = j1939_sk(sk);
> @@ -658,7 +658,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
>   
>   	switch (optname) {
>   	case SO_J1939_FILTER:
> -		if (optval) {
> +		if (!sockptr_is_null(optval)) {
>   			struct j1939_filter *f;
>   			int c;
>   
> @@ -670,7 +670,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
>   				return -EINVAL;
>   
>   			count = optlen / sizeof(*filters);
> -			filters = memdup_user(optval, optlen);
> +			filters = memdup_sockptr(optval, optlen);
>   			if (IS_ERR(filters))
>   				return PTR_ERR(filters);
>   
> @@ -703,7 +703,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
>   	case SO_J1939_SEND_PRIO:
>   		if (optlen != sizeof(tmp))
>   			return -EINVAL;
> -		if (copy_from_user(&tmp, optval, optlen))
> +		if (copy_from_sockptr(&tmp, optval, optlen))
>   			return -EFAULT;
>   		if (tmp < 0 || tmp > 7)
>   			return -EDOM;
> diff --git a/net/can/raw.c b/net/can/raw.c
> index 59c039d73c6d58..94a9405658dc61 100644
> --- a/net/can/raw.c
> +++ b/net/can/raw.c
> @@ -485,7 +485,7 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
>   }
>   
>   static int raw_setsockopt(struct socket *sock, int level, int optname,
> -			  char __user *optval, unsigned int optlen)
> +			  sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	struct raw_sock *ro = raw_sk(sk);
> @@ -511,11 +511,11 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   
>   		if (count > 1) {
>   			/* filter does not fit into dfilter => alloc space */
> -			filter = memdup_user(optval, optlen);
> +			filter = memdup_sockptr(optval, optlen);
>   			if (IS_ERR(filter))
>   				return PTR_ERR(filter);
>   		} else if (count == 1) {
> -			if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
> +			if (copy_from_sockptr(&sfilter, optval, sizeof(sfilter)))
>   				return -EFAULT;
>   		}
>   
> @@ -568,7 +568,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   		if (optlen != sizeof(err_mask))
>   			return -EINVAL;
>   
> -		if (copy_from_user(&err_mask, optval, optlen))
> +		if (copy_from_sockptr(&err_mask, optval, optlen))
>   			return -EFAULT;
>   
>   		err_mask &= CAN_ERR_MASK;
> @@ -607,7 +607,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   		if (optlen != sizeof(ro->loopback))
>   			return -EINVAL;
>   
> -		if (copy_from_user(&ro->loopback, optval, optlen))
> +		if (copy_from_sockptr(&ro->loopback, optval, optlen))
>   			return -EFAULT;
>   
>   		break;
> @@ -616,7 +616,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   		if (optlen != sizeof(ro->recv_own_msgs))
>   			return -EINVAL;
>   
> -		if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
> +		if (copy_from_sockptr(&ro->recv_own_msgs, optval, optlen))
>   			return -EFAULT;
>   
>   		break;
> @@ -625,7 +625,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   		if (optlen != sizeof(ro->fd_frames))
>   			return -EINVAL;
>   
> -		if (copy_from_user(&ro->fd_frames, optval, optlen))
> +		if (copy_from_sockptr(&ro->fd_frames, optval, optlen))
>   			return -EFAULT;
>   
>   		break;
> @@ -634,7 +634,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
>   		if (optlen != sizeof(ro->join_filters))
>   			return -EINVAL;
>   
> -		if (copy_from_user(&ro->join_filters, optval, optlen))
> +		if (copy_from_sockptr(&ro->join_filters, optval, optlen))
>   			return -EFAULT;
>   
>   		break;
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 9cf8318bc51de4..ff22629f10ce92 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -3210,7 +3210,7 @@ EXPORT_SYMBOL(sock_common_recvmsg);
>    *	Set socket options on an inet socket.
>    */
>   int sock_common_setsockopt(struct socket *sock, int level, int optname,
> -			   char __user *optval, unsigned int optlen)
> +			   sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   
> diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
> index 434eea91b7679d..9cc9d1ee6cdb9a 100644
> --- a/net/dccp/dccp.h
> +++ b/net/dccp/dccp.h
> @@ -295,7 +295,7 @@ int dccp_disconnect(struct sock *sk, int flags);
>   int dccp_getsockopt(struct sock *sk, int level, int optname,
>   		    char __user *optval, int __user *optlen);
>   int dccp_setsockopt(struct sock *sk, int level, int optname,
> -		    char __user *optval, unsigned int optlen);
> +		    sockptr_t optval, unsigned int optlen);
>   int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
>   int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
>   int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
> diff --git a/net/dccp/proto.c b/net/dccp/proto.c
> index fd92d3fe321f08..9e58787047f197 100644
> --- a/net/dccp/proto.c
> +++ b/net/dccp/proto.c
> @@ -402,7 +402,7 @@ int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
>   EXPORT_SYMBOL_GPL(dccp_ioctl);
>   
>   static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
> -				   char __user *optval, unsigned int optlen)
> +				   sockptr_t optval, unsigned int optlen)
>   {
>   	struct dccp_sock *dp = dccp_sk(sk);
>   	struct dccp_service_list *sl = NULL;
> @@ -417,9 +417,9 @@ static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
>   			return -ENOMEM;
>   
>   		sl->dccpsl_nr = optlen / sizeof(u32) - 1;
> -		if (copy_from_user(sl->dccpsl_list,
> -				   optval + sizeof(service),
> -				   optlen - sizeof(service)) ||
> +		sockptr_advance(optval, sizeof(service));
> +		if (copy_from_sockptr(sl->dccpsl_list, optval,
> +				      optlen - sizeof(service)) ||
>   		    dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
>   			kfree(sl);
>   			return -EFAULT;
> @@ -473,7 +473,7 @@ static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
>   }
>   
>   static int dccp_setsockopt_ccid(struct sock *sk, int type,
> -				char __user *optval, unsigned int optlen)
> +				sockptr_t optval, unsigned int optlen)
>   {
>   	u8 *val;
>   	int rc = 0;
> @@ -481,7 +481,7 @@ static int dccp_setsockopt_ccid(struct sock *sk, int type,
>   	if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
>   		return -EINVAL;
>   
> -	val = memdup_user(optval, optlen);
> +	val = memdup_sockptr(optval, optlen);
>   	if (IS_ERR(val))
>   		return PTR_ERR(val);
>   
> @@ -498,7 +498,7 @@ static int dccp_setsockopt_ccid(struct sock *sk, int type,
>   }
>   
>   static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
> -		char __user *optval, unsigned int optlen)
> +		sockptr_t optval, unsigned int optlen)
>   {
>   	struct dccp_sock *dp = dccp_sk(sk);
>   	int val, err = 0;
> @@ -520,7 +520,7 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
>   	if (optlen < (int)sizeof(int))
>   		return -EINVAL;
>   
> -	if (get_user(val, (int __user *)optval))
> +	if (copy_from_sockptr(&val, optval, sizeof(int)))
>   		return -EFAULT;
>   
>   	if (optname == DCCP_SOCKOPT_SERVICE)
> @@ -563,8 +563,8 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
>   	return err;
>   }
>   
> -int dccp_setsockopt(struct sock *sk, int level, int optname,
> -		    char __user *optval, unsigned int optlen)
> +int dccp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
> +		    unsigned int optlen)
>   {
>   	if (level != SOL_DCCP)
>   		return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
> diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
> index 7d51ab608fb3f1..3b53d766789d47 100644
> --- a/net/decnet/af_decnet.c
> +++ b/net/decnet/af_decnet.c
> @@ -150,7 +150,8 @@ static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
>   static struct hlist_head dn_wild_sk;
>   static atomic_long_t decnet_memory_allocated;
>   
> -static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
> +static int __dn_setsockopt(struct socket *sock, int level, int optname,
> +		sockptr_t optval, unsigned int optlen, int flags);
>   static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
>   
>   static struct hlist_head *dn_find_list(struct sock *sk)
> @@ -1320,7 +1321,8 @@ static int dn_shutdown(struct socket *sock, int how)
>   	return err;
>   }
>   
> -static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
> +static int dn_setsockopt(struct socket *sock, int level, int optname,
> +		sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = sock->sk;
>   	int err;
> @@ -1332,14 +1334,14 @@ static int dn_setsockopt(struct socket *sock, int level, int optname, char __use
>   	/* we need to exclude all possible ENOPROTOOPTs except default case */
>   	if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
>   	    optname != DSO_STREAM && optname != DSO_SEQPACKET)
> -		err = nf_setsockopt(sk, PF_DECnet, optname,
> -				    USER_SOCKPTR(optval), optlen);
> +		err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
>   #endif
>   
>   	return err;
>   }
>   
> -static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
> +static int __dn_setsockopt(struct socket *sock, int level, int optname,
> +		sockptr_t optval, unsigned int optlen, int flags)
>   {
>   	struct	sock *sk = sock->sk;
>   	struct dn_scp *scp = DN_SK(sk);
> @@ -1355,13 +1357,13 @@ static int __dn_setsockopt(struct socket *sock, int level,int optname, char __us
>   	} u;
>   	int err;
>   
> -	if (optlen && !optval)
> +	if (optlen && sockptr_is_null(optval))
>   		return -EINVAL;
>   
>   	if (optlen > sizeof(u))
>   		return -EINVAL;
>   
> -	if (copy_from_user(&u, optval, optlen))
> +	if (copy_from_sockptr(&u, optval, optlen))
>   		return -EFAULT;
>   
>   	switch (optname) {
> diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
> index 94ae9662133e30..a45a0401adc50b 100644
> --- a/net/ieee802154/socket.c
> +++ b/net/ieee802154/socket.c
> @@ -382,7 +382,7 @@ static int raw_getsockopt(struct sock *sk, int level, int optname,
>   }
>   
>   static int raw_setsockopt(struct sock *sk, int level, int optname,
> -			  char __user *optval, unsigned int optlen)
> +			  sockptr_t optval, unsigned int optlen)
>   {
>   	return -EOPNOTSUPP;
>   }
> @@ -872,7 +872,7 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,
>   }
>   
>   static int dgram_setsockopt(struct sock *sk, int level, int optname,
> -			    char __user *optval, unsigned int optlen)
> +			    sockptr_t optval, unsigned int optlen)
>   {
>   	struct dgram_sock *ro = dgram_sk(sk);
>   	struct net *net = sock_net(sk);
> @@ -882,7 +882,7 @@ static int dgram_setsockopt(struct sock *sk, int level, int optname,
>   	if (optlen < sizeof(int))
>   		return -EINVAL;
>   
> -	if (get_user(val, (int __user *)optval))
> +	if (copy_from_sockptr(&val, optval, sizeof(int)))
>   		return -EFAULT;
>   

For the ieee802154 part:

Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>

regards
Stefan Schmidt

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
@ 2020-07-20 16:37   ` Eric Biggers
  2020-07-20 17:43     ` Christoph Hellwig
  2020-07-21  9:55     ` David Laight
  2020-07-21 10:14   ` David Laight
  1 sibling, 2 replies; 50+ messages in thread
From: Eric Biggers @ 2020-07-20 16:37 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 02:47:16PM +0200, Christoph Hellwig wrote:
> Add a uptr_t type that can hold a pointer to either a user or kernel
> memory region, and simply helpers to copy to and from it.  For
> architectures like x86 that have non-overlapping user and kernel
> address space it just is a union and uses a TASK_SIZE check to
> select the proper copy routine.  For architectures with overlapping
> address spaces a flag to indicate the address space is used instead.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  include/linux/sockptr.h | 121 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 121 insertions(+)
>  create mode 100644 include/linux/sockptr.h
> 
> diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
> new file mode 100644
> index 00000000000000..e41dfa52555dec
> --- /dev/null
> +++ b/include/linux/sockptr.h
> @@ -0,0 +1,121 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2020 Christoph Hellwig.
> + *
> + * Support for "universal" pointers that can point to either kernel or userspace
> + * memory.
> + */
> +#ifndef _LINUX_SOCKPTR_H
> +#define _LINUX_SOCKPTR_H
> +
> +#include <linux/slab.h>
> +#include <linux/uaccess.h>
> +
> +#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
> +typedef union {
> +	void		*kernel;
> +	void __user	*user;
> +} sockptr_t;
> +
> +static inline bool sockptr_is_kernel(sockptr_t sockptr)
> +{
> +	return (unsigned long)sockptr.kernel >= TASK_SIZE;
> +}
> +
> +static inline sockptr_t KERNEL_SOCKPTR(void *p)
> +{
> +	return (sockptr_t) { .kernel = p };
> +}
> +#else /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */
> +typedef struct {
> +	union {
> +		void		*kernel;
> +		void __user	*user;
> +	};
> +	bool		is_kernel : 1;
> +} sockptr_t;
> +
> +static inline bool sockptr_is_kernel(sockptr_t sockptr)
> +{
> +	return sockptr.is_kernel;
> +}
> +
> +static inline sockptr_t KERNEL_SOCKPTR(void *p)
> +{
> +	return (sockptr_t) { .kernel = p, .is_kernel = true };
> +}
> +#endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */
> +
> +static inline sockptr_t USER_SOCKPTR(void __user *p)
> +{
> +	return (sockptr_t) { .user = p };
> +}
> +
> +static inline bool sockptr_is_null(sockptr_t sockptr)
> +{
> +	return !sockptr.user && !sockptr.kernel;
> +}
> +
> +static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
> +{
> +	if (!sockptr_is_kernel(src))
> +		return copy_from_user(dst, src.user, size);
> +	memcpy(dst, src.kernel, size);
> +	return 0;
> +}

How does this not introduce a massive security hole when
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE?

AFAICS, userspace can pass in a pointer >= TASK_SIZE,
and this code makes it be treated as a kernel pointer.

- Eric

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (23 preceding siblings ...)
  2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
@ 2020-07-20 16:38 ` Eric Biggers
  2020-07-20 17:43   ` Christoph Hellwig
  2020-07-20 20:47 ` Alexei Starovoitov
                   ` (2 subsequent siblings)
  27 siblings, 1 reply; 50+ messages in thread
From: Eric Biggers @ 2020-07-20 16:38 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 02:47:13PM +0200, Christoph Hellwig wrote:
> Hi Dave,
> 
> setsockopt is the last place in architecture-independ code that still
> uses set_fs to force the uaccess routines to operate on kernel pointers.
> 
> This series adds a new sockptr_t type that can contained either a kernel
> or user pointer, and which has accessors that do the right thing, and
> then uses it for setsockopt, starting by refactoring some low-level
> helpers and moving them over to it before finally doing the main
> setsockopt method.
> 
> Note that I could not get the eBPF selftests to work, so this has been
> tested with a testing patch that always copies the data first and passes
> a kernel pointer.  This is something that works for most common sockopts
> (and is something that the ePBF support relies on), but unfortunately
> in various corner cases we either don't use the passed in length, or in
> one case actually copy data back from setsockopt, so we unfortunately
> can't just always do the copy in the highlevel code, which would have
> been much nicer.
> 

Please mention what git tree your patchset applies to.

- Eric

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 16:37   ` Eric Biggers
@ 2020-07-20 17:43     ` Christoph Hellwig
  2020-07-20 17:55       ` Eric Biggers
  2020-07-21  9:55     ` David Laight
  1 sibling, 1 reply; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 17:43 UTC (permalink / raw)
  To: Eric Biggers
  Cc: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 09:37:48AM -0700, Eric Biggers wrote:
> How does this not introduce a massive security hole when
> CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE?
> 
> AFAICS, userspace can pass in a pointer >= TASK_SIZE,
> and this code makes it be treated as a kernel pointer.

Yeah, we'll need to validate that before initializing the pointer.

But thinking this a little further:  doesn't this mean any
set_fs(KERNEL_DS) that has other user pointers than the one it is
intended for has the same issue?  Pretty much all of these are gone
in mainline now, but in older stable kernels there might be some
interesting cases, especially in the compat ioctl handlers.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-20 16:38 ` get rid of the address_space override in setsockopt Eric Biggers
@ 2020-07-20 17:43   ` Christoph Hellwig
  0 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-20 17:43 UTC (permalink / raw)
  To: Eric Biggers
  Cc: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 09:38:36AM -0700, Eric Biggers wrote:
> Please mention what git tree your patchset applies to.

net-next/master

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 17:43     ` Christoph Hellwig
@ 2020-07-20 17:55       ` Eric Biggers
  2020-07-22  7:56         ` Christoph Hellwig
  0 siblings, 1 reply; 50+ messages in thread
From: Eric Biggers @ 2020-07-20 17:55 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 07:43:22PM +0200, Christoph Hellwig wrote:
> On Mon, Jul 20, 2020 at 09:37:48AM -0700, Eric Biggers wrote:
> > How does this not introduce a massive security hole when
> > CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE?
> > 
> > AFAICS, userspace can pass in a pointer >= TASK_SIZE,
> > and this code makes it be treated as a kernel pointer.
> 
> Yeah, we'll need to validate that before initializing the pointer.
> 
> But thinking this a little further:  doesn't this mean any
> set_fs(KERNEL_DS) that has other user pointers than the one it is
> intended for has the same issue?  Pretty much all of these are gone
> in mainline now, but in older stable kernels there might be some
> interesting cases, especially in the compat ioctl handlers.

Yes.  I thought that eliminating that class of bug is one of the main
motivations for your "remove set_fs" work.  See commit 128394eff343
("sg_write()/bsg_write() is not fit to be called under KERNEL_DS") for a case
where this type of bug was fixed.

Are you aware of any specific cases that weren't already fixed?  If there are
any, they need to be urgently fixed.

- Eric

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (24 preceding siblings ...)
  2020-07-20 16:38 ` get rid of the address_space override in setsockopt Eric Biggers
@ 2020-07-20 20:47 ` Alexei Starovoitov
  2020-07-22  7:56   ` Christoph Hellwig
  2020-07-21  9:38 ` David Laight
  2020-07-21 10:26 ` David Laight
  27 siblings, 1 reply; 50+ messages in thread
From: Alexei Starovoitov @ 2020-07-20 20:47 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 02:47:13PM +0200, Christoph Hellwig wrote:
> Hi Dave,
> 
> setsockopt is the last place in architecture-independ code that still
> uses set_fs to force the uaccess routines to operate on kernel pointers.
> 
> This series adds a new sockptr_t type that can contained either a kernel
> or user pointer, and which has accessors that do the right thing, and
> then uses it for setsockopt, starting by refactoring some low-level
> helpers and moving them over to it before finally doing the main
> setsockopt method.
> 
> Note that I could not get the eBPF selftests to work, so this has been
> tested with a testing patch that always copies the data first and passes
> a kernel pointer.  This is something that works for most common sockopts
> (and is something that the ePBF support relies on), but unfortunately
> in various corner cases we either don't use the passed in length, or in
> one case actually copy data back from setsockopt, so we unfortunately
> can't just always do the copy in the highlevel code, which would have
> been much nicer.

could you rebase on bpf-next tree and we can route it this way then?
we'll also test the whole thing before applying.

sounds like v2 is needed anyway to address Eric's addr space concern?

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 24/24] net: pass a sockptr_t into ->setsockopt
  2020-07-20 14:19   ` Stefan Schmidt
@ 2020-07-20 23:20     ` David Miller
  0 siblings, 0 replies; 50+ messages in thread
From: David Miller @ 2020-07-20 23:20 UTC (permalink / raw)
  To: stefan
  Cc: hch, kuba, ast, daniel, kuznet, yoshfuji, edumazet, linux-crypto,
	linux-kernel, netdev, bpf, netfilter-devel, coreteam, linux-sctp,
	linux-hams, linux-bluetooth, bridge, linux-can, dccp,
	linux-decnet-user, linux-wpan, linux-s390, mptcp, lvs-devel,
	rds-devel, linux-afs, tipc-discussion, linux-x25

From: Stefan Schmidt <stefan@datenfreihafen.org>
Date: Mon, 20 Jul 2020 16:19:38 +0200

> For the ieee802154 part:
> 
> Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>

Please do not quote an entire patch just to add an ACK, trim it just
to the commit message, or even less.

Thank you.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 02/24] bpfilter: fix up a sparse annotation
  2020-07-20 12:47 ` [PATCH 02/24] bpfilter: fix up a sparse annotation Christoph Hellwig
@ 2020-07-21  2:40   ` Luc Van Oostenryck
  2020-07-21  5:23     ` Christoph Hellwig
  0 siblings, 1 reply; 50+ messages in thread
From: Luc Van Oostenryck @ 2020-07-21  2:40 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 02:47:15PM +0200, Christoph Hellwig wrote:
> The __user doesn't make sense when casting to an integer type.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  net/bpfilter/bpfilter_kern.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
> index 977e9dad72ca4f..713b4b3d02005d 100644
> --- a/net/bpfilter/bpfilter_kern.c
> +++ b/net/bpfilter/bpfilter_kern.c
> @@ -49,7 +49,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
>  	req.is_set = is_set;
>  	req.pid = current->pid;
>  	req.cmd = optname;
> -	req.addr = (long __force __user)optval;
> +	req.addr = (__force long)optval;

For casts to integers, even '__force' is not needed (since integers
can't be dereferenced, the concept of address-space is meaningless
for them, so it's never useful to warn when it's dropped and
'__force' is thus not needed).

-- Luc

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 02/24] bpfilter: fix up a sparse annotation
  2020-07-21  2:40   ` Luc Van Oostenryck
@ 2020-07-21  5:23     ` Christoph Hellwig
  2020-07-21  5:28       ` Al Viro
  0 siblings, 1 reply; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-21  5:23 UTC (permalink / raw)
  To: Luc Van Oostenryck
  Cc: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Tue, Jul 21, 2020 at 04:40:16AM +0200, Luc Van Oostenryck wrote:
> >  	req.pid = current->pid;
> >  	req.cmd = optname;
> > -	req.addr = (long __force __user)optval;
> > +	req.addr = (__force long)optval;
> 
> For casts to integers, even '__force' is not needed (since integers
> can't be dereferenced, the concept of address-space is meaningless
> for them, so it's never useful to warn when it's dropped and
> '__force' is thus not needed).

That's what I thought. but if I remove it here I actually do get a
warning:

CHECK   net/bpfilter/bpfilter_kern.c
net/bpfilter/bpfilter_kern.c:52:21: warning: cast removes address space '__user' of expression

Using this recent sparse build:

hch@brick:~/work/linux$ sparse --version
v0.6.2-49-g707c5017

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 02/24] bpfilter: fix up a sparse annotation
  2020-07-21  5:23     ` Christoph Hellwig
@ 2020-07-21  5:28       ` Al Viro
  0 siblings, 0 replies; 50+ messages in thread
From: Al Viro @ 2020-07-21  5:28 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: Luc Van Oostenryck, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Tue, Jul 21, 2020 at 07:23:26AM +0200, Christoph Hellwig wrote:
> On Tue, Jul 21, 2020 at 04:40:16AM +0200, Luc Van Oostenryck wrote:
> > >  	req.pid = current->pid;
> > >  	req.cmd = optname;
> > > -	req.addr = (long __force __user)optval;
> > > +	req.addr = (__force long)optval;
> > 
> > For casts to integers, even '__force' is not needed (since integers
> > can't be dereferenced, the concept of address-space is meaningless
> > for them, so it's never useful to warn when it's dropped and
> > '__force' is thus not needed).
> 
> That's what I thought. but if I remove it here I actually do get a
> warning:
> 
> CHECK   net/bpfilter/bpfilter_kern.c
> net/bpfilter/bpfilter_kern.c:52:21: warning: cast removes address space '__user' of expression

Cast to unsigned long.  Or to uintptr_t if you want to be fancy.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t
  2020-07-20 12:47 ` [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt " Christoph Hellwig
@ 2020-07-21  8:36   ` David Laight
  2020-07-22  8:00     ` 'Christoph Hellwig'
  0 siblings, 1 reply; 50+ messages in thread
From: David Laight @ 2020-07-21  8:36 UTC (permalink / raw)
  To: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

From: Christoph Hellwig
> Sent: 20 July 2020 13:47
> 
> This is mostly to prepare for cleaning up the callers, as bpfilter by
> design can't handle kernel pointers.
                      ^^^ user ??

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: get rid of the address_space override in setsockopt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (25 preceding siblings ...)
  2020-07-20 20:47 ` Alexei Starovoitov
@ 2020-07-21  9:38 ` David Laight
  2020-07-22  8:06   ` 'Christoph Hellwig'
  2020-07-21 10:26 ` David Laight
  27 siblings, 1 reply; 50+ messages in thread
From: David Laight @ 2020-07-21  9:38 UTC (permalink / raw)
  To: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

From: Christoph Hellwig
> Sent: 20 July 2020 13:47
>
> setsockopt is the last place in architecture-independ code that still
> uses set_fs to force the uaccess routines to operate on kernel pointers.
> 
> This series adds a new sockptr_t type that can contained either a kernel
> or user pointer, and which has accessors that do the right thing, and
> then uses it for setsockopt, starting by refactoring some low-level
> helpers and moving them over to it before finally doing the main
> setsockopt method.

Are you planning to make the equivalent change to getsockopt()?
Having mismatched interfaces would be very strange.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 16:37   ` Eric Biggers
  2020-07-20 17:43     ` Christoph Hellwig
@ 2020-07-21  9:55     ` David Laight
  1 sibling, 0 replies; 50+ messages in thread
From: David Laight @ 2020-07-21  9:55 UTC (permalink / raw)
  To: 'Eric Biggers', Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

From: Eric Biggers
> Sent: 20 July 2020 17:38
...
> How does this not introduce a massive security hole when
> CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE?
> 
> AFAICS, userspace can pass in a pointer >= TASK_SIZE,
> and this code makes it be treated as a kernel pointer.

One thought I've had is that on 64-bit architectures there
is almost always some part of the KVA that can never be valid
and is larger than the maximum size of a user VA.

If the user address is offset into this invalid area
then it can always be distinguished from a kernel address.

Indeed it may be worth considering offsetting kernel
addresses as well.

This forces code to use the correct accessors.

It doesn't solve the problem for 32bit systems with
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE since
they are likely to have all 32bit addresses available
to both use and kernel.

If you end up with a 'fat pointer' then it may be worth
adding the length and making it a 'buffer descriptor'.
This can then be passed by address and the reduced
number of parameters will probably offset the cost
of the extra indirection.

The read/write functions could then take the 'buffer descriptor',
offset and length as parameters.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
  2020-07-20 16:37   ` Eric Biggers
@ 2020-07-21 10:14   ` David Laight
  1 sibling, 0 replies; 50+ messages in thread
From: David Laight @ 2020-07-21 10:14 UTC (permalink / raw)
  To: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

From: Christoph Hellwig
> Sent: 20 July 2020 13:47
> 
> Add a uptr_t type that can hold a pointer to either a user or kernel
> memory region, and simply helpers to copy to and from it.  For
> architectures like x86 that have non-overlapping user and kernel
> address space it just is a union and uses a TASK_SIZE check to
> select the proper copy routine.  For architectures with overlapping
> address spaces a flag to indicate the address space is used instead.
> 
...
> +#else /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */
> +typedef struct {
> +	union {
> +		void		*kernel;
> +		void __user	*user;
> +	};
> +	bool		is_kernel : 1;
> +} sockptr_t;

If you need to do that you might as well make it a struct
where either the kernel or user address is defined.
Far safer for all architectures.

Indeed you could add the length (to save passing an
extra parameter through the layers).

The system call code could even copy the code into a
kernel buffer (setting both pointers).
So that code that didn't need to access beyond the end
of the implied buffer (most of it) could just access the
kernel buffer.

For getsockopt() you'd need some way of supressing the
'default' copy back of the user buffer.

This would also allow some of the sctp getsockopt to
read (usually 4 bytes) from the 'user' buffer without
the wrapper code always having to read in the entire
user buffer.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: get rid of the address_space override in setsockopt
  2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
                   ` (26 preceding siblings ...)
  2020-07-21  9:38 ` David Laight
@ 2020-07-21 10:26 ` David Laight
  2020-07-22  8:07   ` 'Christoph Hellwig'
  27 siblings, 1 reply; 50+ messages in thread
From: David Laight @ 2020-07-21 10:26 UTC (permalink / raw)
  To: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet
  Cc: linux-crypto, linux-kernel, netdev, bpf, netfilter-devel,
	coreteam, linux-sctp, linux-hams, linux-bluetooth, bridge,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

From: Christoph Hellwig
> Sent: 20 July 2020 13:47
> 
> setsockopt is the last place in architecture-independ code that still
> uses set_fs to force the uaccess routines to operate on kernel pointers.
> 
> This series adds a new sockptr_t type that can contained either a kernel
> or user pointer, and which has accessors that do the right thing, and
> then uses it for setsockopt, starting by refactoring some low-level
> helpers and moving them over to it before finally doing the main
> setsockopt method.

Another 'gotcha' ...

On an least some architectures (possibly only m68k) IIRC all structures
are actually passed by reference.
(This used to be true for sparc - but it may have changed in the
last 30 years.)

	David
 

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 03/24] net: add a new sockptr_t type
  2020-07-20 17:55       ` Eric Biggers
@ 2020-07-22  7:56         ` Christoph Hellwig
  0 siblings, 0 replies; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-22  7:56 UTC (permalink / raw)
  To: Eric Biggers
  Cc: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 10:55:43AM -0700, Eric Biggers wrote:
> On Mon, Jul 20, 2020 at 07:43:22PM +0200, Christoph Hellwig wrote:
> > On Mon, Jul 20, 2020 at 09:37:48AM -0700, Eric Biggers wrote:
> > > How does this not introduce a massive security hole when
> > > CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE?
> > > 
> > > AFAICS, userspace can pass in a pointer >= TASK_SIZE,
> > > and this code makes it be treated as a kernel pointer.
> > 
> > Yeah, we'll need to validate that before initializing the pointer.
> > 
> > But thinking this a little further:  doesn't this mean any
> > set_fs(KERNEL_DS) that has other user pointers than the one it is
> > intended for has the same issue?  Pretty much all of these are gone
> > in mainline now, but in older stable kernels there might be some
> > interesting cases, especially in the compat ioctl handlers.
> 
> Yes.  I thought that eliminating that class of bug is one of the main
> motivations for your "remove set_fs" work.  See commit 128394eff343
> ("sg_write()/bsg_write() is not fit to be called under KERNEL_DS") for a case
> where this type of bug was fixed.
> 
> Are you aware of any specific cases that weren't already fixed?  If there are
> any, they need to be urgently fixed.

current mainline has almost no set_fs left, and setsockopt seems
pretty much safe.  But if we go back a long term stable release or two
I bet I'd find one or two.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-20 20:47 ` Alexei Starovoitov
@ 2020-07-22  7:56   ` Christoph Hellwig
  2020-07-22 17:09     ` Alexei Starovoitov
  0 siblings, 1 reply; 50+ messages in thread
From: Christoph Hellwig @ 2020-07-22  7:56 UTC (permalink / raw)
  To: Alexei Starovoitov
  Cc: Christoph Hellwig, David S. Miller, Jakub Kicinski,
	Alexei Starovoitov, Daniel Borkmann, Alexey Kuznetsov,
	Hideaki YOSHIFUJI, Eric Dumazet, linux-crypto, linux-kernel,
	netdev, bpf, netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Mon, Jul 20, 2020 at 01:47:56PM -0700, Alexei Starovoitov wrote:
> > a kernel pointer.  This is something that works for most common sockopts
> > (and is something that the ePBF support relies on), but unfortunately
> > in various corner cases we either don't use the passed in length, or in
> > one case actually copy data back from setsockopt, so we unfortunately
> > can't just always do the copy in the highlevel code, which would have
> > been much nicer.
> 
> could you rebase on bpf-next tree and we can route it this way then?
> we'll also test the whole thing before applying.

The bpf-next tree is missing all my previous setsockopt cleanups, so
there series won't apply.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t
  2020-07-21  8:36   ` David Laight
@ 2020-07-22  8:00     ` 'Christoph Hellwig'
  2020-07-22  8:01       ` 'Christoph Hellwig'
  0 siblings, 1 reply; 50+ messages in thread
From: 'Christoph Hellwig' @ 2020-07-22  8:00 UTC (permalink / raw)
  To: David Laight
  Cc: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Tue, Jul 21, 2020 at 08:36:57AM +0000, David Laight wrote:
> From: Christoph Hellwig
> > Sent: 20 July 2020 13:47
> > 
> > This is mostly to prepare for cleaning up the callers, as bpfilter by
> > design can't handle kernel pointers.
>                       ^^^ user ??

No, it can't handle user pointers. 

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t
  2020-07-22  8:00     ` 'Christoph Hellwig'
@ 2020-07-22  8:01       ` 'Christoph Hellwig'
  0 siblings, 0 replies; 50+ messages in thread
From: 'Christoph Hellwig' @ 2020-07-22  8:01 UTC (permalink / raw)
  To: David Laight
  Cc: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Wed, Jul 22, 2020 at 10:00:23AM +0200, 'Christoph Hellwig' wrote:
> On Tue, Jul 21, 2020 at 08:36:57AM +0000, David Laight wrote:
> > From: Christoph Hellwig
> > > Sent: 20 July 2020 13:47
> > > 
> > > This is mostly to prepare for cleaning up the callers, as bpfilter by
> > > design can't handle kernel pointers.
> >                       ^^^ user ??
> 
> No, it can't handle user pointers. 

Err, I mean it can only handle user pointers.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-21  9:38 ` David Laight
@ 2020-07-22  8:06   ` 'Christoph Hellwig'
  2020-07-22  8:21     ` David Laight
  0 siblings, 1 reply; 50+ messages in thread
From: 'Christoph Hellwig' @ 2020-07-22  8:06 UTC (permalink / raw)
  To: David Laight
  Cc: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Tue, Jul 21, 2020 at 09:38:23AM +0000, David Laight wrote:
> From: Christoph Hellwig
> > Sent: 20 July 2020 13:47
> >
> > setsockopt is the last place in architecture-independ code that still
> > uses set_fs to force the uaccess routines to operate on kernel pointers.
> > 
> > This series adds a new sockptr_t type that can contained either a kernel
> > or user pointer, and which has accessors that do the right thing, and
> > then uses it for setsockopt, starting by refactoring some low-level
> > helpers and moving them over to it before finally doing the main
> > setsockopt method.
> 
> Are you planning to make the equivalent change to getsockopt()?

No.  Only setsockopt can be fed kernel addresses from bpf-cgroup.
There is no point in complicating the read side interface when it
doesn't have that problem.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-21 10:26 ` David Laight
@ 2020-07-22  8:07   ` 'Christoph Hellwig'
  0 siblings, 0 replies; 50+ messages in thread
From: 'Christoph Hellwig' @ 2020-07-22  8:07 UTC (permalink / raw)
  To: David Laight
  Cc: 'Christoph Hellwig',
	David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

On Tue, Jul 21, 2020 at 10:26:58AM +0000, David Laight wrote:
> From: Christoph Hellwig
> > Sent: 20 July 2020 13:47
> > 
> > setsockopt is the last place in architecture-independ code that still
> > uses set_fs to force the uaccess routines to operate on kernel pointers.
> > 
> > This series adds a new sockptr_t type that can contained either a kernel
> > or user pointer, and which has accessors that do the right thing, and
> > then uses it for setsockopt, starting by refactoring some low-level
> > helpers and moving them over to it before finally doing the main
> > setsockopt method.
> 
> Another 'gotcha' ...
> 
> On an least some architectures (possibly only m68k) IIRC all structures
> are actually passed by reference.
> (This used to be true for sparc - but it may have changed in the
> last 30 years.)

Tough luck for ABIs wit suboptimal calling conventions.  At least we can
do the right thing for those that do not have the problem.

^ permalink raw reply	[flat|nested] 50+ messages in thread

* RE: get rid of the address_space override in setsockopt
  2020-07-22  8:06   ` 'Christoph Hellwig'
@ 2020-07-22  8:21     ` David Laight
  0 siblings, 0 replies; 50+ messages in thread
From: David Laight @ 2020-07-22  8:21 UTC (permalink / raw)
  To: 'Christoph Hellwig'
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

From: 'Christoph Hellwig'
> Sent: 22 July 2020 09:07
> On Tue, Jul 21, 2020 at 09:38:23AM +0000, David Laight wrote:
> > From: Christoph Hellwig
> > > Sent: 20 July 2020 13:47
> > >
> > > setsockopt is the last place in architecture-independ code that still
> > > uses set_fs to force the uaccess routines to operate on kernel pointers.
> > >
> > > This series adds a new sockptr_t type that can contained either a kernel
> > > or user pointer, and which has accessors that do the right thing, and
> > > then uses it for setsockopt, starting by refactoring some low-level
> > > helpers and moving them over to it before finally doing the main
> > > setsockopt method.
> >
> > Are you planning to make the equivalent change to getsockopt()?
> 
> No.  Only setsockopt can be fed kernel addresses from bpf-cgroup.
> There is no point in complicating the read side interface when it
> doesn't have that problem.

You realise that one of the SCTP getsockopt() is actually a command!
It is one of the requests that changes state and should probably
have been a separate system call.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: [MPTCP] [PATCH 24/24] net: pass a sockptr_t into ->setsockopt
  2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
  2020-07-20 14:19   ` Stefan Schmidt
@ 2020-07-22  8:26   ` Matthieu Baerts
  1 sibling, 0 replies; 50+ messages in thread
From: Matthieu Baerts @ 2020-07-22  8:26 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, linux-crypto, linux-kernel, netdev, bpf,
	netfilter-devel, coreteam, linux-sctp, linux-hams,
	linux-bluetooth, bridge, linux-can, dccp, linux-decnet-user,
	linux-wpan, linux-s390, mptcp, lvs-devel, rds-devel, linux-afs,
	tipc-discussion, linux-x25

Hi Christoph,

On 20/07/2020 14:47, Christoph Hellwig wrote:
> Rework the remaining setsockopt code to pass a sockptr_t instead of a
> plain user pointer.  This removes the last remaining set_fs(KERNEL_DS)
> outside of architecture specific code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

...
> diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
> index 27b6f250b87dfd..30a8e697b9db9c 100644
> --- a/net/mptcp/protocol.c
> +++ b/net/mptcp/protocol.c
> @@ -1627,7 +1627,7 @@ static void mptcp_destroy(struct sock *sk)
>   }
>   
>   static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
> -				       char __user *optval, unsigned int optlen)
> +				       sockptr_t optval, unsigned int optlen)
>   {
>   	struct sock *sk = (struct sock *)msk;
>   	struct socket *ssock;
> @@ -1643,8 +1643,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
>   			return -EINVAL;
>   		}
>   
> -		ret = sock_setsockopt(ssock, SOL_SOCKET, optname,
> -				      USER_SOCKPTR(optval), optlen);
> +		ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval,
> +				      optlen);

A very small detail related to the modifications in MPTCP code, only if 
you have to send a v2 and if you don't mind: may you move "optlen" to 
the previous line like it was before your patch 7/24. Same below at the 
end of the function.

That would reduce the global diff in MPTCP files to function signatures 
only.

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net

^ permalink raw reply	[flat|nested] 50+ messages in thread

* Re: get rid of the address_space override in setsockopt
  2020-07-22  7:56   ` Christoph Hellwig
@ 2020-07-22 17:09     ` Alexei Starovoitov
  0 siblings, 0 replies; 50+ messages in thread
From: Alexei Starovoitov @ 2020-07-22 17:09 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
	Daniel Borkmann, Alexey Kuznetsov, Hideaki YOSHIFUJI,
	Eric Dumazet, Linux Crypto Mailing List, LKML,
	Network Development, bpf, netfilter-devel, coreteam, linux-sctp,
	linux-hams, linux-bluetooth, moderated list:ETHERNET BRIDGE,
	linux-can, dccp, linux-decnet-user, linux-wpan, linux-s390,
	mptcp, lvs-devel, rds-devel, linux-afs, tipc-discussion,
	linux-x25

On Wed, Jul 22, 2020 at 12:56 AM Christoph Hellwig <hch@lst.de> wrote:
>
> On Mon, Jul 20, 2020 at 01:47:56PM -0700, Alexei Starovoitov wrote:
> > > a kernel pointer.  This is something that works for most common sockopts
> > > (and is something that the ePBF support relies on), but unfortunately
> > > in various corner cases we either don't use the passed in length, or in
> > > one case actually copy data back from setsockopt, so we unfortunately
> > > can't just always do the copy in the highlevel code, which would have
> > > been much nicer.
> >
> > could you rebase on bpf-next tree and we can route it this way then?
> > we'll also test the whole thing before applying.
>
> The bpf-next tree is missing all my previous setsockopt cleanups, so
> there series won't apply.

Right. I've realized that after sending that email two days ago.
Now bpf-next->net-next PR is pending and as soon as it's merged
bpf-next will have all the recent bits.

^ permalink raw reply	[flat|nested] 50+ messages in thread

end of thread, back to index

Thread overview: 50+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
2020-07-20 12:47 ` [PATCH 01/24] bpfilter: reject kernel addresses Christoph Hellwig
2020-07-20 12:47 ` [PATCH 02/24] bpfilter: fix up a sparse annotation Christoph Hellwig
2020-07-21  2:40   ` Luc Van Oostenryck
2020-07-21  5:23     ` Christoph Hellwig
2020-07-21  5:28       ` Al Viro
2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
2020-07-20 16:37   ` Eric Biggers
2020-07-20 17:43     ` Christoph Hellwig
2020-07-20 17:55       ` Eric Biggers
2020-07-22  7:56         ` Christoph Hellwig
2020-07-21  9:55     ` David Laight
2020-07-21 10:14   ` David Laight
2020-07-20 12:47 ` [PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 05/24] net: switch sock_setbindtodevice " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 06/24] net: switch sock_set_timeout " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 07/24] " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 08/24] net/xfrm: switch xfrm_user_policy " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 09/24] netfilter: remove the unused user argument to do_update_counters Christoph Hellwig
2020-07-20 12:47 ` [PATCH 10/24] netfilter: switch xt_copy_counters to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 11/24] netfilter: switch nf_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt " Christoph Hellwig
2020-07-21  8:36   ` David Laight
2020-07-22  8:00     ` 'Christoph Hellwig'
2020-07-22  8:01       ` 'Christoph Hellwig'
2020-07-20 12:47 ` [PATCH 13/24] net/ipv4: switch ip_mroute_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 14/24] net/ipv4: merge ip_options_get and ip_options_get_from_user Christoph Hellwig
2020-07-20 12:47 ` [PATCH 15/24] net/ipv4: switch do_ip_setsockopt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 16/24] net/ipv6: switch ip6_mroute_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt Christoph Hellwig
2020-07-20 12:47 ` [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 19/24] net/ipv6: factor out a ipv6_set_opt_hdr helper Christoph Hellwig
2020-07-20 12:47 ` [PATCH 20/24] net/ipv6: switch do_ipv6_setsockopt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 21/24] net/udp: switch udp_lib_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 22/24] net/tcp: switch ->md5_parse " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 23/24] net/tcp: switch do_tcp_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
2020-07-20 14:19   ` Stefan Schmidt
2020-07-20 23:20     ` David Miller
2020-07-22  8:26   ` [MPTCP] " Matthieu Baerts
2020-07-20 16:38 ` get rid of the address_space override in setsockopt Eric Biggers
2020-07-20 17:43   ` Christoph Hellwig
2020-07-20 20:47 ` Alexei Starovoitov
2020-07-22  7:56   ` Christoph Hellwig
2020-07-22 17:09     ` Alexei Starovoitov
2020-07-21  9:38 ` David Laight
2020-07-22  8:06   ` 'Christoph Hellwig'
2020-07-22  8:21     ` David Laight
2020-07-21 10:26 ` David Laight
2020-07-22  8:07   ` 'Christoph Hellwig'

Linux-WPAN Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-wpan/0 linux-wpan/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-wpan linux-wpan/ https://lore.kernel.org/linux-wpan \
		linux-wpan@vger.kernel.org
	public-inbox-index linux-wpan

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-wpan


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git