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selinux: Fix error priority for bind with AF_UNSPEC on PF_INET6 socket

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[ Upstream commit bbf5a1d0e5d0fb3bdf90205aa872636122692a50 ]

The IPv6 network stack first checks the sockaddr length (-EINVAL error)
before checking the family (-EAFNOSUPPORT error).

This was discovered thanks to commit a549d055a22e ("selftests/landlock:
Add network tests").

Cc: Eric Paris <eparis@parisplace.org>
Cc: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>
Reported-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Closes: https://lore.kernel.org/r/0584f91c-537c-4188-9e4f-04f192565667@collabora.com
Fixes: 0f8db8cc73df ("selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()")
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Tested-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mickaël Salaün 2024-01-03 17:34:15 +01:00 committed by Ksawlii
parent 2ae8b200a7
commit 0ea9049fe3
1 changed files with 7 additions and 0 deletions
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7
security/selinux/hooks.c
View file

@ -4689,6 +4689,13 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
return -EINVAL;
addr4 = (struct sockaddr_in *)address;
if (family_sa == AF_UNSPEC) {
if (family == PF_INET6) {
/* Length check from inet6_bind_sk() */
if (addrlen < SIN6_LEN_RFC2133)
return -EINVAL;
/* Family check from __inet6_bind() */
goto err_af;
}
/* see __inet_bind(), we only want to allow
* AF_UNSPEC if the address is INADDR_ANY
*/