[apparmor] [PATCH 32/32] apparmor: Fix quieting of audit messages for network mediation

[John Johansen]

From: John Johansen <john.johansen at canonical.com>

If a profile specified a quieting of network denials for a given rule by
either the quiet or deny rule qualifiers, the resultant quiet mask for
denied requests was applied incorrectly, resulting in two potential bugs.
1. The misapplied quiet mask would prevent denials from being correctly
   tested against the kill mask/mode. Thus network access requests that
   should have resulted in the application being killed did not.

2. The actual quieting of the denied network request was not being applied.
   This would result in network rejections always being logged even when
   they had been specifically marked as quieted.

Signed-off-by: John Johansen <john.johansen at canonical.com>
---
 security/apparmor/net.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/apparmor/net.c b/security/apparmor/net.c
index 003dd18..6e6e5c9 100644
--- a/security/apparmor/net.c
+++ b/security/apparmor/net.c
@@ -88,7 +88,7 @@ static int audit_net(struct aa_profile *profile, int op, u16 family, int type,
 	} else {
 		u16 quiet_mask = profile->net.quiet[sa.u.net->family];
 		u16 kill_mask = 0;
-		u16 denied = (1 << sa.aad->net.type) & ~quiet_mask;
+		u16 denied = (1 << sa.aad->net.type);
 
 		if (denied & kill_mask)
 			audit_type = AUDIT_APPARMOR_KILL;
-- 
1.7.10.4