audit: Use struct net not pid_t to remember the network namespce to reply in

While reading through 3.14-rc1 I found a pretty siginficant mishandling
of network namespaces in the recent audit changes.

In struct audit_netlink_list and audit_reply add a reference to the
network namespace of the caller and remove the userspace pid of the
caller.  This cleanly remembers the callers network namespace, and
removes a huge class of races and nasty failure modes that can occur
when attempting to relook up the callers network namespace from a pid_t
(including the caller's network namespace changing, pid wraparound, and
the pid simply not being present).

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/audit.h b/kernel/audit.h
index 38c967d28de5..7bb65730c890 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -253,7 +253,7 @@ extern void		    audit_panic(const char *message);
 
 struct audit_netlink_list {
         __u32 portid;
-        pid_t pid;
+        struct net *net;
         struct sk_buff_head q;
 };