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af_unix: Fix memory leaks of the whole sk due to OOB skb.
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[ Upstream commit 7a62ed6 ]

syzbot reported a sequence of memory leaks, and one of them indicated we
failed to free a whole sk:

  unreferenced object 0xffff8880126e0000 (size 1088):
    comm "syz-executor419", pid 326, jiffies 4294773607 (age 12.609s)
    hex dump (first 32 bytes):
      00 00 00 00 00 00 00 00 7d 00 00 00 00 00 00 00  ........}.......
      01 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00  ...@............
    backtrace:
      [<000000006fefe750>] sk_prot_alloc+0x64/0x2a0 net/core/sock.c:1970
      [<0000000074006db5>] sk_alloc+0x3b/0x800 net/core/sock.c:2029
      [<00000000728cd434>] unix_create1+0xaf/0x920 net/unix/af_unix.c:928
      [<00000000a279a139>] unix_create+0x113/0x1d0 net/unix/af_unix.c:997
      [<0000000068259812>] __sock_create+0x2ab/0x550 net/socket.c:1516
      [<00000000da1521e1>] sock_create net/socket.c:1566 [inline]
      [<00000000da1521e1>] __sys_socketpair+0x1a8/0x550 net/socket.c:1698
      [<000000007ab259e1>] __do_sys_socketpair net/socket.c:1751 [inline]
      [<000000007ab259e1>] __se_sys_socketpair net/socket.c:1748 [inline]
      [<000000007ab259e1>] __x64_sys_socketpair+0x97/0x100 net/socket.c:1748
      [<000000007dedddc1>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
      [<000000007dedddc1>] do_syscall_64+0x38/0x90 arch/x86/entry/common.c:80
      [<000000009456679f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

We can reproduce this issue by creating two AF_UNIX SOCK_STREAM sockets,
send()ing an OOB skb to each other, and close()ing them without consuming
the OOB skbs.

  int skpair[2];

  socketpair(AF_UNIX, SOCK_STREAM, 0, skpair);

  send(skpair[0], "x", 1, MSG_OOB);
  send(skpair[1], "x", 1, MSG_OOB);

  close(skpair[0]);
  close(skpair[1]);

Currently, we free an OOB skb in unix_sock_destructor() which is called via
__sk_free(), but it's too late because the receiver's unix_sk(sk)->oob_skb
is accounted against the sender's sk->sk_wmem_alloc and __sk_free() is
called only when sk->sk_wmem_alloc is 0.

In the repro sequences, we do not consume the OOB skb, so both two sk's
sock_put() never reach __sk_free() due to the positive sk->sk_wmem_alloc.
Then, no one can consume the OOB skb nor call __sk_free(), and we finally
leak the two whole sk.

Thus, we must free the unconsumed OOB skb earlier when close()ing the
socket.

Fixes: 314001f ("af_unix: Add OOB support")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@q2ven @gregkh
q2ven authored and gregkh committed Oct 21, 2022
1 parent afe7053 commit 2f415ad
Showing 1 changed file with 7 additions and 6 deletions.
13 changes: 7 additions & 6 deletions net/unix/af_unix.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -569,12 +569,6 @@ static void unix_sock_destructor(struct sock *sk)

skb_queue_purge(&sk->sk_receive_queue);

#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
if (u->oob_skb) {
kfree_skb(u->oob_skb);
u->oob_skb = NULL;
}
#endif
DEBUG_NET_WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
DEBUG_NET_WARN_ON_ONCE(!sk_unhashed(sk));
DEBUG_NET_WARN_ON_ONCE(sk->sk_socket);
Expand Down Expand Up @@ -620,6 +614,13 @@ static void unix_release_sock(struct sock *sk, int embrion)

unix_state_unlock(sk);

#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
if (u->oob_skb) {
kfree_skb(u->oob_skb);
u->oob_skb = NULL;
}
#endif

wake_up_interruptible_all(&u->peer_wait);

if (skpair != NULL) {
Expand Down

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