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Message-ID: <20231228113917.62089-1-mic@digikod.net>
Date: Thu, 28 Dec 2023 12:39:17 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: Eric Paris <eparis@...isplace.org>,
Paul Moore <paul@...l-moore.com>,
Stephen Smalley <stephen.smalley.work@...il.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
Alexey Kodanev <alexey.kodanev@...cle.com>,
Günther Noack <gnoack@...gle.com>,
Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
Muhammad Usama Anjum <usama.anjum@...labora.com>,
linux-security-module@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH] selinux: Fix error priority for bind with AF_UNSPEC on AF_INET6 socket
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: Alexey Kodanev <alexey.kodanev@...cle.com>
Cc: Eric Paris <eparis@...isplace.org>
Cc: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc: Paul Moore <paul@...l-moore.com>
Cc: Stephen Smalley <stephen.smalley.work@...il.com>
Reported-by: Muhammad Usama Anjum <usama.anjum@...labora.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@...ikod.net>
---
security/selinux/hooks.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index feda711c6b7b..9fc55973d765 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4667,6 +4667,10 @@ 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 (sock->sk->__sk_common.skc_family ==
+ AF_INET6 &&
+ addrlen < SIN6_LEN_RFC2133)
+ return -EINVAL;
/* see __inet_bind(), we only want to allow
* AF_UNSPEC if the address is INADDR_ANY
*/
--
2.43.0
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