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Smack: type confusion in smak sendmsg() handler

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Smack security handler for sendmsg() syscall
is vulnerable to type confusion issue what
can allow to privilege escalation into root
or cause denial of service.

A malicious attacker can create socket of one
type for example AF_UNIX and pass is into
sendmsg() function ensuring that this is
AF_INET socket.

Remedy
Do not trust user supplied data.
Proposed fix below.

Signed-off-by: Roman Kubiak <r.kubiak@samsung.com>
Signed-off-by: Mateusz Fruba <m.fruba@samsung.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Roman Kubiak 2015-12-17 13:24:35 +01:00 committed by Casey Schaufler
parent 79be093500
commit 81bd0d5629
1 changed files with 1 additions and 1 deletions
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2
security/smack/smack_lsm.c
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@ -3780,7 +3780,7 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
if (sip == NULL)
return 0;
switch (sip->sin_family) {
switch (sock->sk->sk_family) {
case AF_INET:
rc = smack_netlabel_send(sock->sk, sip);
break;