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@xxxxxxxxxxxxxxxxxxx/ Fixes: 0f8db8cc73df ("selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()") Signed-off-by: Mikhail Ivanov <ivanov.mikhail1@xxxxxxxxxxxxxxxxxxx> --- security/selinux/hooks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index ad3abd48eed1..15e31299a833 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4828,7 +4828,7 @@ 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; } base-commit: d7b6918e22c74f2b354d8dc0ef31ab17ae334b93 -- 2.34.1
