AUDIT: Wait for backlog to clear when generating messages.

Add a gfp_mask to audit_log_start() and audit_log(), to reduce the
amount of GFP_ATOMIC allocation -- most of it doesn't need to be 
GFP_ATOMIC. Also if the mask includes __GFP_WAIT, then wait up to
60 seconds for the auditd backlog to clear instead of immediately 
abandoning the message. 

The timeout should probably be made configurable, but for now it'll 
suffice that it only happens if auditd is actually running.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 451502467a9b..2d088bb65ee8 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -242,7 +242,7 @@ void __init avc_init(void)
         avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),
                                              0, SLAB_PANIC, NULL, NULL);
 
-        audit_log(current->audit_context, AUDIT_KERNEL, "AVC INITIALIZED\n");
+        audit_log(current->audit_context, GFP_KERNEL, AUDIT_KERNEL, "AVC INITIALIZED\n");
 }
 
 int avc_get_hash_stats(char *page)
@@ -550,7 +550,7 @@ void avc_audit(u32 ssid, u32 tsid,
                         return;
         }
 
-        ab = audit_log_start(current->audit_context, AUDIT_AVC);
+        ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC);
         if (!ab)
                 return;         /* audit_panic has been called */
         audit_log_format(ab, "avc:  %s ", denied ? "denied" : "granted");