From: Arnd Bergmann <arnd@kernel.org>
To: netdev@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v4 2/4] net: socket: rework SIOC?IFMAP ioctls
Date: Tue, 24 Nov 2020 16:18:26 +0100 [thread overview]
Message-ID: <20201124151828.169152-3-arnd@kernel.org> (raw)
In-Reply-To: <20201124151828.169152-1-arnd@kernel.org>
From: Arnd Bergmann <arnd@arndb.de>
SIOCGIFMAP and SIOCSIFMAP currently require compat_alloc_user_space()
and copy_in_user() for compat mode.
Move the compat handling into the location where the structures are
actually used, to avoid using those interfaces and get a clearer
implementation.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
changes in v3:
- complete rewrite
changes in v2:
- fix building with CONFIG_COMPAT disabled (0day bot)
- split up dev_ifmap() into more readable helpers (hch)
- move rcu_read_unlock() for readability (hch)
---
include/linux/compat.h | 18 ++++++------
net/core/dev_ioctl.c | 64 +++++++++++++++++++++++++++++++++---------
net/socket.c | 39 ++-----------------------
3 files changed, 62 insertions(+), 59 deletions(-)
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 08dbd34bb7a5..47496c5eb5eb 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -96,6 +96,15 @@ struct compat_iovec {
compat_size_t iov_len;
};
+struct compat_ifmap {
+ compat_ulong_t mem_start;
+ compat_ulong_t mem_end;
+ unsigned short base_addr;
+ unsigned char irq;
+ unsigned char dma;
+ unsigned char port;
+};
+
#ifdef CONFIG_COMPAT
#ifndef compat_user_stack_pointer
@@ -314,15 +323,6 @@ typedef struct compat_sigevent {
} _sigev_un;
} compat_sigevent_t;
-struct compat_ifmap {
- compat_ulong_t mem_start;
- compat_ulong_t mem_end;
- unsigned short base_addr;
- unsigned char irq;
- unsigned char dma;
- unsigned char port;
-};
-
struct compat_if_settings {
unsigned int type; /* Type of physical device or protocol */
unsigned int size; /* Size of the data allocated by the caller */
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index db8a0ff86f36..de3df6fe65fe 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -98,6 +98,55 @@ int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
return 0;
}
+static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
+{
+ struct ifmap *ifmap = &ifr->ifr_map;
+ struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
+
+ if (in_compat_syscall()) {
+ cifmap->mem_start = dev->mem_start;
+ cifmap->mem_end = dev->mem_end;
+ cifmap->base_addr = dev->base_addr;
+ cifmap->irq = dev->irq;
+ cifmap->dma = dev->dma;
+ cifmap->port = dev->if_port;
+
+ return 0;
+ }
+
+ ifmap->mem_start = dev->mem_start;
+ ifmap->mem_end = dev->mem_end;
+ ifmap->base_addr = dev->base_addr;
+ ifmap->irq = dev->irq;
+ ifmap->dma = dev->dma;
+ ifmap->port = dev->if_port;
+
+ return 0;
+}
+
+static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
+{
+ struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
+
+ if (!dev->netdev_ops->ndo_set_config)
+ return -EOPNOTSUPP;
+
+ if (in_compat_syscall()) {
+ struct ifmap ifmap = {
+ .mem_start = cifmap->mem_start,
+ .mem_end = cifmap->mem_end,
+ .base_addr = cifmap->base_addr,
+ .irq = cifmap->irq,
+ .dma = cifmap->dma,
+ .port = cifmap->port,
+ };
+
+ return dev->netdev_ops->ndo_set_config(dev, &ifmap);
+ }
+
+ return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
+}
+
/*
* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
*/
@@ -139,13 +188,7 @@ static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cm
break;
case SIOCGIFMAP:
- ifr->ifr_map.mem_start = dev->mem_start;
- ifr->ifr_map.mem_end = dev->mem_end;
- ifr->ifr_map.base_addr = dev->base_addr;
- ifr->ifr_map.irq = dev->irq;
- ifr->ifr_map.dma = dev->dma;
- ifr->ifr_map.port = dev->if_port;
- return 0;
+ return dev_getifmap(dev, ifr);
case SIOCGIFINDEX:
ifr->ifr_ifindex = dev->ifindex;
@@ -286,12 +329,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
return 0;
case SIOCSIFMAP:
- if (ops->ndo_set_config) {
- if (!netif_device_present(dev))
- return -ENODEV;
- return ops->ndo_set_config(dev, &ifr->ifr_map);
- }
- return -EOPNOTSUPP;
+ return dev_setifmap(dev, ifr);
case SIOCADDMULTI:
if (!ops->ndo_set_rx_mode ||
diff --git a/net/socket.c b/net/socket.c
index 60df84a91051..2d32c8576e95 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3198,40 +3198,6 @@ static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
return err;
}
-static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
- struct compat_ifreq __user *uifr32)
-{
- struct ifreq ifr;
- struct compat_ifmap __user *uifmap32;
- int err;
-
- uifmap32 = &uifr32->ifr_ifru.ifru_map;
- err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
- err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
- err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
- err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
- err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
- err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
- err |= get_user(ifr.ifr_map.port, &uifmap32->port);
- if (err)
- return -EFAULT;
-
- err = dev_ioctl(net, cmd, &ifr, NULL);
-
- if (cmd == SIOCGIFMAP && !err) {
- err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
- err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
- err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
- err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
- err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
- err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
- err |= put_user(ifr.ifr_map.port, &uifmap32->port);
- if (err)
- err = -EFAULT;
- }
- return err;
-}
-
/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
* for some operations; this forces use of the newer bridge-utils that
* use compatible ioctls
@@ -3265,9 +3231,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
return compat_dev_ifconf(net, argp);
case SIOCWANDEV:
return compat_siocwandev(net, argp);
- case SIOCGIFMAP:
- case SIOCSIFMAP:
- return compat_sioc_ifmap(net, cmd, argp);
case SIOCGSTAMP_OLD:
case SIOCGSTAMPNS_OLD:
if (!sock->ops->gettstamp)
@@ -3297,6 +3260,8 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
case SIOCGIFFLAGS:
case SIOCSIFFLAGS:
+ case SIOCGIFMAP:
+ case SIOCSIFMAP:
case SIOCGIFMETRIC:
case SIOCSIFMETRIC:
case SIOCGIFMTU:
--
2.27.0
next prev parent reply other threads:[~2020-11-24 15:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 15:18 [PATCH net-next v4 0/4] remove compat_alloc_user_space() Arnd Bergmann
2020-11-24 15:18 ` [PATCH v4 1/4] ethtool: improve compat ioctl handling Arnd Bergmann
2020-11-24 16:19 ` David Laight
2020-11-24 19:42 ` Arnd Bergmann
2020-11-24 15:18 ` Arnd Bergmann [this message]
2020-11-24 16:13 ` [PATCH v4 2/4] net: socket: rework SIOC?IFMAP ioctls David Laight
2020-11-24 19:05 ` Arnd Bergmann
2020-11-24 22:12 ` David Laight
2020-11-24 15:18 ` [PATCH v4 3/4] net: socket: simplify dev_ifconf handling Arnd Bergmann
2020-11-24 20:52 ` Jakub Kicinski
2020-11-24 15:18 ` [PATCH v4 4/4] net: socket: rework compat_ifreq_ioctl() Arnd Bergmann
2021-01-27 18:19 ` [PATCH net-next v4 0/4] remove compat_alloc_user_space() Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201124151828.169152-3-arnd@kernel.org \
--to=arnd@kernel.org \
--cc=arnd@arndb.de \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).