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af_unix: Read with MSG_PEEK loops if the first unread byte is OOB 

Read with MSG_PEEK flag loops if the first byte to read is an OOB byte.
commit 22dd70eb2c ("af_unix: Don't peek OOB data without MSG_OOB.")
addresses the loop issue but does not address the issue that no data
beyond OOB byte can be read.

>>> from socket import *
>>> c1, c2 = socketpair(AF_UNIX, SOCK_STREAM)
>>> c1.send(b'a', MSG_OOB)
1
>>> c1.send(b'b')
1
>>> c2.recv(1, MSG_PEEK | MSG_DONTWAIT)
b'b'

>>> from socket import *
>>> c1, c2 = socketpair(AF_UNIX, SOCK_STREAM)
>>> c2.setsockopt(SOL_SOCKET, SO_OOBINLINE, 1)
>>> c1.send(b'a', MSG_OOB)
1
>>> c1.send(b'b')
1
>>> c2.recv(1, MSG_PEEK | MSG_DONTWAIT)
b'a'
>>> c2.recv(1, MSG_PEEK | MSG_DONTWAIT)
b'a'
>>> c2.recv(1, MSG_DONTWAIT)
b'a'
>>> c2.recv(1, MSG_PEEK | MSG_DONTWAIT)
b'b'
>>>

Fixes: 314001f0bf ("af_unix: Add OOB support")
Signed-off-by: Rao Shoaib <Rao.Shoaib@oracle.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240611084639.2248934-1-Rao.Shoaib@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Rao Shoaib 2024-06-11 01:46:39 -07:00 committed by Jakub Kicinski
parent 7d9df38c9c
commit a6736a0add
1 changed files with 9 additions and 9 deletions
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18
net/unix/af_unix.c
View File

@ -2625,18 +2625,18 @@ static struct sk_buff *manage_oob(struct sk_buff *skb, struct sock *sk,
if (skb == u->oob_skb) {
if (copied) {
skb = NULL;
} else if (sock_flag(sk, SOCK_URGINLINE)) {
if (!(flags & MSG_PEEK)) {
} else if (!(flags & MSG_PEEK)) {
if (sock_flag(sk, SOCK_URGINLINE)) {
WRITE_ONCE(u->oob_skb, NULL);
consume_skb(skb);
} else {
__skb_unlink(skb, &sk->sk_receive_queue);
WRITE_ONCE(u->oob_skb, NULL);
unlinked_skb = skb;
skb = skb_peek(&sk->sk_receive_queue);
}
} else if (flags & MSG_PEEK) {
skb = NULL;
} else {
__skb_unlink(skb, &sk->sk_receive_queue);
WRITE_ONCE(u->oob_skb, NULL);
unlinked_skb = skb;
skb = skb_peek(&sk->sk_receive_queue);
} else if (!sock_flag(sk, SOCK_URGINLINE)) {
skb = skb_peek_next(skb, &sk->sk_receive_queue);
}
}