From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Guillaume Nault <g.nault@alphalink.fr>,
Arnd Bergmann <arnd@arndb.de>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.14 23/33] compat_ioctl: pppoe: fix PPPOEIOCSFWD handling
Date: Thu, 8 Aug 2019 21:05:30 +0200 [thread overview]
Message-ID: <20190808190454.759879073@linuxfoundation.org> (raw)
In-Reply-To: <20190808190453.582417307@linuxfoundation.org>
From: Arnd Bergmann <arnd@arndb.de>
[ Upstream commit 055d88242a6046a1ceac3167290f054c72571cd9 ]
Support for handling the PPPOEIOCSFWD ioctl in compat mode was added in
linux-2.5.69 along with hundreds of other commands, but was always broken
sincen only the structure is compatible, but the command number is not,
due to the size being sizeof(size_t), or at first sizeof(sizeof((struct
sockaddr_pppox)), which is different on 64-bit architectures.
Guillaume Nault adds:
And the implementation was broken until 2016 (see 29e73269aa4d ("pppoe:
fix reference counting in PPPoE proxy")), and nobody ever noticed. I
should probably have removed this ioctl entirely instead of fixing it.
Clearly, it has never been used.
Fix it by adding a compat_ioctl handler for all pppoe variants that
translates the command number and then calls the regular ioctl function.
All other ioctl commands handled by pppoe are compatible between 32-bit
and 64-bit, and require compat_ptr() conversion.
This should apply to all stable kernels.
Acked-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ppp/pppoe.c | 3 +++
drivers/net/ppp/pppox.c | 13 +++++++++++++
drivers/net/ppp/pptp.c | 3 +++
fs/compat_ioctl.c | 3 ---
include/linux/if_pppox.h | 3 +++
net/l2tp/l2tp_ppp.c | 3 +++
6 files changed, 25 insertions(+), 3 deletions(-)
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -1137,6 +1137,9 @@ static const struct proto_ops pppoe_ops
.recvmsg = pppoe_recvmsg,
.mmap = sock_no_mmap,
.ioctl = pppox_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pppox_compat_ioctl,
+#endif
};
static const struct pppox_proto pppoe_proto = {
--- a/drivers/net/ppp/pppox.c
+++ b/drivers/net/ppp/pppox.c
@@ -22,6 +22,7 @@
#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
+#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/net.h>
@@ -103,6 +104,18 @@ int pppox_ioctl(struct socket *sock, uns
EXPORT_SYMBOL(pppox_ioctl);
+#ifdef CONFIG_COMPAT
+int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ if (cmd == PPPOEIOCSFWD32)
+ cmd = PPPOEIOCSFWD;
+
+ return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
+}
+
+EXPORT_SYMBOL(pppox_compat_ioctl);
+#endif
+
static int pppox_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
--- a/drivers/net/ppp/pptp.c
+++ b/drivers/net/ppp/pptp.c
@@ -636,6 +636,9 @@ static const struct proto_ops pptp_ops =
.recvmsg = sock_no_recvmsg,
.mmap = sock_no_mmap,
.ioctl = pppox_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pppox_compat_ioctl,
+#endif
};
static const struct pppox_proto pppox_pptp_proto = {
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1032,9 +1032,6 @@ COMPATIBLE_IOCTL(PPPIOCDISCONN)
COMPATIBLE_IOCTL(PPPIOCATTCHAN)
COMPATIBLE_IOCTL(PPPIOCGCHAN)
COMPATIBLE_IOCTL(PPPIOCGL2TPSTATS)
-/* PPPOX */
-COMPATIBLE_IOCTL(PPPOEIOCSFWD)
-COMPATIBLE_IOCTL(PPPOEIOCDFWD)
/* Big A */
/* sparc only */
/* Big Q for sound/OSS */
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -84,6 +84,9 @@ extern int register_pppox_proto(int prot
extern void unregister_pppox_proto(int proto_num);
extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+extern int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+
+#define PPPOEIOCSFWD32 _IOW(0xB1 ,0, compat_size_t)
/* PPPoX socket states */
enum {
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -1793,6 +1793,9 @@ static const struct proto_ops pppol2tp_o
.recvmsg = pppol2tp_recvmsg,
.mmap = sock_no_mmap,
.ioctl = pppox_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pppox_compat_ioctl,
+#endif
};
static const struct pppox_proto pppol2tp_proto = {
next prev parent reply other threads:[~2019-08-08 19:11 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 19:05 [PATCH 4.14 00/33] 4.14.138-stable review Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 01/33] scsi: fcoe: Embed fc_rport_priv in fcoe_rport structure Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 02/33] ARM: dts: Add pinmuxing for i2c2 and i2c3 for LogicPD SOM-LV Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 03/33] ARM: dts: Add pinmuxing for i2c2 and i2c3 for LogicPD torpedo Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 04/33] tcp: be more careful in tcp_fragment() Greg Kroah-Hartman
2019-08-20 16:45 ` Matthieu Baerts
2019-08-23 12:50 ` [PATCH] tcp: fix tcp_rtx_queue_tail in case of empty retransmit queue Tim Froidcoeur
2019-08-23 16:56 ` Christoph Paasch
2019-08-23 21:46 ` David Miller
2019-08-24 6:03 ` [PATCH 4.14] " Tim Froidcoeur
2019-08-24 22:05 ` Jonathan Lemon
2019-08-30 23:26 ` Christoph Paasch
2019-08-31 2:20 ` David Miller
2019-08-31 10:53 ` maowenan
2019-08-31 11:44 ` maowenan
[not found] ` <CAOj+RUsqTUF9fuetskRRw26Z=sBM-mELSMcV21Ch06007aP5yQ@mail.gmail.com>
[not found] ` <F95AC9340317A84688A5F0DF0246F3F21AAB8F82@dggeml512-mbx.china.huawei.com>
2019-09-03 6:58 ` Tim Froidcoeur
2019-09-03 8:55 ` maowenan
2019-08-31 12:20 ` Sasha Levin
2019-08-31 13:14 ` Matthieu Baerts
2019-09-01 0:07 ` Sasha Levin
2019-08-08 19:05 ` [PATCH 4.14 05/33] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG,ERG} Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 06/33] HID: wacom: fix bit shift for Cintiq Companion 2 Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 07/33] HID: Add quirk for HP X1200 PIXART OEM mouse Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 08/33] RDMA: Directly cast the sockaddr union to sockaddr Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 09/33] [PATCH] IB: directly cast the sockaddr union to aockaddr Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 10/33] objtool: Add machine_real_restart() to the noreturn list Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 11/33] objtool: Add rewind_stack_do_exit() " Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 12/33] atm: iphase: Fix Spectre v1 vulnerability Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 13/33] ife: error out when nla attributes are empty Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 14/33] ip6_tunnel: fix possible use-after-free on xmit Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 15/33] net: bridge: delete local fdb on device init failure Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 16/33] net: bridge: mcast: dont delete permanent entries when fast leave is enabled Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 17/33] net: fix ifindex collision during namespace removal Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 18/33] net/mlx5: Use reversed order when unregister devices Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 19/33] net: phylink: Fix flow control for fixed-link Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 20/33] net: sched: Fix a possible null-pointer dereference in dequeue_func() Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 21/33] NFC: nfcmrvl: fix gpio-handling regression Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 22/33] tipc: compat: allow tipc commands without arguments Greg Kroah-Hartman
2019-08-08 19:05 ` Greg Kroah-Hartman [this message]
2019-08-08 19:05 ` [PATCH 4.14 24/33] net/mlx5e: Prevent encap flow counter update async to user query Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 25/33] tun: mark small packets as owned by the tap sock Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 26/33] mvpp2: refactor MTU change code Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 27/33] bnx2x: Disable multi-cos feature Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 28/33] cgroup: Call cgroup_release() before __exit_signal() Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 29/33] cgroup: Implement css_task_iter_skip() Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 30/33] cgroup: Include dying leaders with live threads in PROCS iterations Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 31/33] cgroup: css_task_iter_skip()d iterators must be advanced before accessed Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 32/33] cgroup: Fix css_task_iter_advance_css_set() cset skip condition Greg Kroah-Hartman
2019-08-08 19:05 ` [PATCH 4.14 33/33] spi: bcm2835: Fix 3-wire mode if DMA is enabled Greg Kroah-Hartman
2019-08-09 0:41 ` [PATCH 4.14 00/33] 4.14.138-stable review shuah
2019-08-09 3:16 ` Naresh Kamboju
2019-08-09 15:36 ` Guenter Roeck
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