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net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF.

Browse source 
SIOCBRDELIF is passed to dev_ioctl() first and later forwarded to
br_ioctl_call(), which causes unnecessary RTNL dance and the splat
below [0] under RTNL pressure.

Let's say Thread A is trying to detach a device from a bridge and
Thread B is trying to remove the bridge.

In dev_ioctl(), Thread A bumps the bridge device's refcnt by
netdev_hold() and releases RTNL because the following br_ioctl_call()
also re-acquires RTNL.

In the race window, Thread B could acquire RTNL and try to remove
the bridge device.  Then, rtnl_unlock() by Thread B will release RTNL
and wait for netdev_put() by Thread A.

Thread A, however, must hold RTNL after the unlock in dev_ifsioc(),
which may take long under RTNL pressure, resulting in the splat by
Thread B.

  Thread A (SIOCBRDELIF)           Thread B (SIOCBRDELBR)
  ----------------------           ----------------------
  sock_ioctl                       sock_ioctl
  `- sock_do_ioctl                 `- br_ioctl_call
     `- dev_ioctl                     `- br_ioctl_stub
        |- rtnl_lock                     |
        |- dev_ifsioc                    '
        '  |- dev = __dev_get_by_name(...)
           |- netdev_hold(dev, ...)      .
       /   |- rtnl_unlock  ------.       |
       |   |- br_ioctl_call       `--->  |- rtnl_lock
  Race |   |  `- br_ioctl_stub           |- br_del_bridge
  Window   |     |                       |  |- dev = __dev_get_by_name(...)
       |   |     |  May take long        |  `- br_dev_delete(dev, ...)
       |   |     |  under RTNL pressure  |     `- unregister_netdevice_queue(dev, ...)
       |   |     |               |       `- rtnl_unlock
       \   |     |- rtnl_lock  <-'          `- netdev_run_todo
           |     |- ...                        `- netdev_run_todo
           |     `- rtnl_unlock                   |- __rtnl_unlock
           |                                      |- netdev_wait_allrefs_any
           |- netdev_put(dev, ...)  <----------------'
                                                Wait refcnt decrement
                                                and log splat below

To avoid blocking SIOCBRDELBR unnecessarily, let's not call
dev_ioctl() for SIOCBRADDIF and SIOCBRDELIF.

In the dev_ioctl() path, we do the following:

  1. Copy struct ifreq by get_user_ifreq in sock_do_ioctl()
  2. Check CAP_NET_ADMIN in dev_ioctl()
  3. Call dev_load() in dev_ioctl()
  4. Fetch the master dev from ifr.ifr_name in dev_ifsioc()

3. can be done by request_module() in br_ioctl_call(), so we move
1., 2., and 4. to br_ioctl_stub().

Note that 2. is also checked later in add_del_if(), but it's better
performed before RTNL.

SIOCBRADDIF and SIOCBRDELIF have been processed in dev_ioctl() since
the pre-git era, and there seems to be no specific reason to process
them there.

[0]:
unregister_netdevice: waiting for wpan3 to become free. Usage count = 2
ref_tracker: wpan3@ffff8880662d8608 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_hold include/linux/netdevice.h:4311 [inline]
     dev_ifsioc+0xc6a/0x1160 net/core/dev_ioctl.c:624
     dev_ioctl+0x255/0x10c0 net/core/dev_ioctl.c:826
     sock_do_ioctl+0x1ca/0x260 net/socket.c:1213
     sock_ioctl+0x23a/0x6c0 net/socket.c:1318
     vfs_ioctl fs/ioctl.c:51 [inline]
     __do_sys_ioctl fs/ioctl.c:906 [inline]
     __se_sys_ioctl fs/ioctl.c:892 [inline]
     __x64_sys_ioctl+0x1a4/0x210 fs/ioctl.c:892
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xcb/0x250 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

Fixes: 893b195875 ("net: bridge: fix ioctl locking")
Reported-by: syzkaller <syzkaller@googlegroups.com>
Reported-by: yan kang <kangyan91@outlook.com>
Reported-by: yue sun <samsun1006219@gmail.com>
Closes: https://lore.kernel.org/netdev/SY8P300MB0421225D54EB92762AE8F0F2A1D32@SY8P300MB0421.AUSP300.PROD.OUTLOOK.COM/
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20250316192851.19781-1-kuniyu@amazon.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kuniyuki Iwashima 2025-03-16 12:28:37 -07:00 • committed by Paolo Abeni
parent 919f9f497d
commit ed3ba9b6e2
5 changed files with 45 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

19
net/socket.c
View file

@ -1145,12 +1145,10 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
*/
static DEFINE_MUTEX(br_ioctl_mutex);
static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
unsigned int cmd, struct ifreq *ifr,
static int (*br_ioctl_hook)(struct net *net, unsigned int cmd,
void __user *uarg);
void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
unsigned int cmd, struct ifreq *ifr,
void brioctl_set(int (*hook)(struct net *net, unsigned int cmd,
void __user *uarg))
{
mutex_lock(&br_ioctl_mutex);
@ -1159,8 +1157,7 @@ void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
}
EXPORT_SYMBOL(brioctl_set);
int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
struct ifreq *ifr, void __user *uarg)
int br_ioctl_call(struct net *net, unsigned int cmd, void __user *uarg)
{
int err = -ENOPKG;
@ -1169,7 +1166,7 @@ int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
mutex_lock(&br_ioctl_mutex);
if (br_ioctl_hook)
err = br_ioctl_hook(net, br, cmd, ifr, uarg);
err = br_ioctl_hook(net, cmd, uarg);
mutex_unlock(&br_ioctl_mutex);
return err;
@ -1269,7 +1266,9 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
case SIOCSIFBR:
case SIOCBRADDBR:
case SIOCBRDELBR:
err = br_ioctl_call(net, NULL, cmd, NULL, argp);
case SIOCBRADDIF:
case SIOCBRDELIF:
err = br_ioctl_call(net, cmd, argp);
break;
case SIOCGIFVLAN:
case SIOCSIFVLAN:
@ -3429,6 +3428,8 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
case SIOCGPGRP:
case SIOCBRADDBR:
case SIOCBRDELBR:
case SIOCBRADDIF:
case SIOCBRDELIF:
case SIOCGIFVLAN:
case SIOCSIFVLAN:
case SIOCGSKNS:
@ -3468,8 +3469,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
case SIOCGIFPFLAGS:
case SIOCGIFTXQLEN:
case SIOCSIFTXQLEN:
case SIOCBRADDIF:
case SIOCBRDELIF:
case SIOCGIFNAME:
case SIOCSIFNAME:
case SIOCGMIIPHY: