[SRU][[T/X][PATCH 1/1] socket: close race condition between sock_close() and sockfs_setattr()

[Khalid Elmously]

From: Cong Wang <xiyou.wangcong at gmail.com>

fchownat() doesn't even hold refcnt of fd until it figures out
fd is really needed (otherwise is ignored) and releases it after
it resolves the path. This means sock_close() could race with
sockfs_setattr(), which leads to a NULL pointer dereference
since typically we set sock->sk to NULL in ->release().

As pointed out by Al, this is unique to sockfs. So we can fix this
in socket layer by acquiring inode_lock in sock_close() and
checking against NULL in sockfs_setattr().

sock_release() is called in many places, only the sock_close()
path matters here. And fortunately, this should not affect normal
sock_close() as it is only called when the last fd refcnt is gone.
It only affects sock_close() with a parallel sockfs_setattr() in
progress, which is not common.

Fixes: 86741ec25462 ("net: core: Add a UID field to struct sock.")
Reported-by: shankarapailoor <shankarapailoor at gmail.com>
Cc: Tetsuo Handa <penguin-kernel at i-love.sakura.ne.jp>
Cc: Lorenzo Colitti <lorenzo at google.com>
Cc: Al Viro <viro at zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(backported from 6d8c50dcb029872b298eea68cc6209c866fd3e14)
Signed-off-by: Khalid Elmously <khalid.elmously at canonical.com>
---
 net/socket.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 1895b9eff43b..338d64756cb2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -564,12 +564,16 @@ static struct socket *sock_alloc(void)
  *	an inode not a file.
  */
 
-void sock_release(struct socket *sock)
+static void __sock_release(struct socket *sock, struct inode *inode)
 {
 	if (sock->ops) {
 		struct module *owner = sock->ops->owner;
 
+		if (inode)
+			inode_lock(inode);
 		sock->ops->release(sock);
+		if (inode)
+			inode_unlock(inode);
 		sock->ops = NULL;
 		module_put(owner);
 	}
@@ -584,6 +588,11 @@ void sock_release(struct socket *sock)
 	}
 	sock->file = NULL;
 }
+
+void sock_release(struct socket *sock)
+{
+	__sock_release(sock, NULL);
+}
 EXPORT_SYMBOL(sock_release);
 
 void __sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags)
@@ -1019,7 +1028,7 @@ static int sock_mmap(struct file *file, struct vm_area_struct *vma)
 
 static int sock_close(struct inode *inode, struct file *filp)
 {
-	sock_release(SOCKET_I(inode));
+	__sock_release(SOCKET_I(inode), inode);
 	return 0;
 }
 
-- 
2.17.1