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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2024-06-24 18:36:37 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-06-27 12:05:00 +0200 |
| commit | b94038d841a91d0e3f59cfe4d073e210910366ee (patch) | |
| tree | b869399ee5e9b3d3f41a9a84a21406d17807321a /net/unix/af_unix.c | |
| parent | d098d77232c375cb2cded4a7099f0a763016ee0d (diff) | |
| download | linux-b94038d841a91d0e3f59cfe4d073e210910366ee.tar.gz linux-b94038d841a91d0e3f59cfe4d073e210910366ee.tar.bz2 linux-b94038d841a91d0e3f59cfe4d073e210910366ee.zip | |
af_unix: Stop recv(MSG_PEEK) at consumed OOB skb.
After consuming OOB data, recv() reading the preceding data must break at
the OOB skb regardless of MSG_PEEK.
Currently, MSG_PEEK does not stop recv() for AF_UNIX, and the behaviour is
not compliant with TCP.
>>> from socket import *
>>> c1, c2 = socketpair(AF_UNIX)
>>> c1.send(b'hello', MSG_OOB)
5
>>> c1.send(b'world')
5
>>> c2.recv(1, MSG_OOB)
b'o'
>>> c2.recv(9, MSG_PEEK) # This should return b'hell'
b'hellworld' # even with enough buffer.
Let's fix it by returning NULL for consumed skb and unlinking it only if
MSG_PEEK is not specified.
This patch also adds test cases that add recv(MSG_PEEK) before each recv().
Without fix:
# RUN msg_oob.peek.oob_ahead_break ...
# msg_oob.c:134:oob_ahead_break:AF_UNIX :hellworld
# msg_oob.c:135:oob_ahead_break:Expected:hell
# msg_oob.c:137:oob_ahead_break:Expected ret[0] (9) == expected_len (4)
# oob_ahead_break: Test terminated by assertion
# FAIL msg_oob.peek.oob_ahead_break
not ok 13 msg_oob.peek.oob_ahead_break
With fix:
# RUN msg_oob.peek.oob_ahead_break ...
# OK msg_oob.peek.oob_ahead_break
ok 13 msg_oob.peek.oob_ahead_break
Fixes: 314001f0bf92 ("af_unix: Add OOB support")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/unix/af_unix.c')
| -rw-r--r-- | net/unix/af_unix.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 5e695a9a609c..2eaecf9d78a4 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -2613,9 +2613,12 @@ static struct sk_buff *manage_oob(struct sk_buff *skb, struct sock *sk, { struct unix_sock *u = unix_sk(sk); - if (!unix_skb_len(skb) && !(flags & MSG_PEEK)) { - skb_unlink(skb, &sk->sk_receive_queue); - consume_skb(skb); + if (!unix_skb_len(skb)) { + if (!(flags & MSG_PEEK)) { + skb_unlink(skb, &sk->sk_receive_queue); + consume_skb(skb); + } + skb = NULL; } else { struct sk_buff *unlinked_skb = NULL; |