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selinux: Fix SCTP error inconsistency in selinux_socket_bind()

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Check sk->sk_protocol instead of security class to recognize SCTP socket.
SCTP socket is initialized with SECCLASS_SOCKET class if policy does not
support EXTSOCKCLASS capability. In this case bind(2) hook wrongfully
return EAFNOSUPPORT instead of EINVAL.

The inconsistency was detected with help of Landlock tests:
https://lore.kernel.org/all/b58680ca-81b2-7222-7287-0ac7f4227c3c@huawei-partners.com/

Fixes: 0f8db8cc73 ("selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()")
Signed-off-by: Mikhail Ivanov <ivanov.mikhail1@huawei-partners.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Mikhail Ivanov 2024-11-12 22:52:03 +08:00 committed by Paul Moore
parent c75c7945cd
commit 034294fbfd
1 changed files with 1 additions and 1 deletions
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2
security/selinux/hooks.c
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@ -4835,7 +4835,7 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
return err;
err_af:
/* Note that SCTP services expect -EINVAL, others -EAFNOSUPPORT. */
if (sksec->sclass == SECCLASS_SCTP_SOCKET)
if (sk->sk_protocol == IPPROTO_SCTP)
return -EINVAL;
return -EAFNOSUPPORT;
}