[ 029/110] net: Check the correct namespace when spoofing pid over SCM_RIGHTS

[Greg Kroah-Hartman]

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>

commit d661684cf6820331feae71146c35da83d794467e upstream.

This is a security bug.

The follow-up will fix nsproxy to discourage this type of issue from
happening again.

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Reviewed-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/core/scm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -54,7 +54,7 @@ static __inline__ int scm_check_creds(st
 		return -EINVAL;
 
 	if ((creds->pid == task_tgid_vnr(current) ||
-	     ns_capable(current->nsproxy->pid_ns->user_ns, CAP_SYS_ADMIN)) &&
+	     ns_capable(task_active_pid_ns(current)->user_ns, CAP_SYS_ADMIN)) &&
 	    ((uid_eq(uid, cred->uid)   || uid_eq(uid, cred->euid) ||
 	      uid_eq(uid, cred->suid)) || nsown_capable(CAP_SETUID)) &&
 	    ((gid_eq(gid, cred->gid)   || gid_eq(gid, cred->egid) ||


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