1 files changed, 16 insertions, 45 deletions

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index ad451cf9375e..97f4c944a20f 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -297,26 +297,27 @@ static struct avc_xperms_decision_node
 	struct avc_xperms_decision_node *xpd_node;
 	struct extended_perms_decision *xpd;
 
-	xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep, GFP_NOWAIT);
+	xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep,
+				     GFP_NOWAIT | __GFP_NOWARN);
 	if (!xpd_node)
 		return NULL;
 
 	xpd = &xpd_node->xpd;
 	if (which & XPERMS_ALLOWED) {
 		xpd->allowed = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->allowed)
 			goto error;
 	}
 	if (which & XPERMS_AUDITALLOW) {
 		xpd->auditallow = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->auditallow)
 			goto error;
 	}
 	if (which & XPERMS_DONTAUDIT) {
 		xpd->dontaudit = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->dontaudit)
 			goto error;
 	}
@@ -344,7 +345,7 @@ static struct avc_xperms_node *avc_xperms_alloc(void)
 {
 	struct avc_xperms_node *xp_node;
 
-	xp_node = kmem_cache_zalloc(avc_xperms_cachep, GFP_NOWAIT);
+	xp_node = kmem_cache_zalloc(avc_xperms_cachep, GFP_NOWAIT | __GFP_NOWARN);
 	if (!xp_node)
 		return xp_node;
 	INIT_LIST_HEAD(&xp_node->xpd_head);
@@ -500,7 +501,7 @@ static struct avc_node *avc_alloc_node(struct selinux_avc *avc)
 {
 	struct avc_node *node;
 
-	node = kmem_cache_zalloc(avc_node_cachep, GFP_NOWAIT);
+	node = kmem_cache_zalloc(avc_node_cachep, GFP_NOWAIT | __GFP_NOWARN);
 	if (!node)
 		goto out;
 
@@ -758,7 +759,11 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
 	}
 }
 
-/* This is the slow part of avc audit with big stack footprint */
+/*
+ * This is the slow part of avc audit with big stack footprint.
+ * Note that it is non-blocking and can be called from under
+ * rcu_read_lock().
+ */
 noinline int slow_avc_audit(struct selinux_state *state,
 			    u32 ssid, u32 tsid, u16 tclass,
 			    u32 requested, u32 audited, u32 denied, int result,
@@ -819,13 +824,13 @@ out:
 }
 
 /**
- * avc_update_node Update an AVC entry
+ * avc_update_node - Update an AVC entry
  * @event : Updating event
  * @perms : Permission mask bits
  * @ssid,@tsid,@tclass : identifier of an AVC entry
  * @seqno : sequence number when decision was made
  * @xpd: extended_perms_decision to be added to the node
- * @flags: the AVC_* flags, e.g. AVC_NONBLOCKING, AVC_EXTENDED_PERMS, or 0.
+ * @flags: the AVC_* flags, e.g. AVC_EXTENDED_PERMS, or 0.
  *
  * if a valid AVC entry doesn't exist,this function returns -ENOENT.
  * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
@@ -844,21 +849,6 @@ static int avc_update_node(struct selinux_avc *avc,
 	struct hlist_head *head;
 	spinlock_t *lock;
 
-	/*
-	 * If we are in a non-blocking code path, e.g. VFS RCU walk,
-	 * then we must not add permissions to a cache entry
-	 * because we will not audit the denial.  Otherwise,
-	 * during the subsequent blocking retry (e.g. VFS ref walk), we
-	 * will find the permissions already granted in the cache entry
-	 * and won't audit anything at all, leading to silent denials in
-	 * permissive mode that only appear when in enforcing mode.
-	 *
-	 * See the corresponding handling of MAY_NOT_BLOCK in avc_audit()
-	 * and selinux_inode_permission().
-	 */
-	if (flags & AVC_NONBLOCKING)
-		return 0;
-
 	node = avc_alloc_node(avc);
 	if (!node) {
 		rc = -ENOMEM;
@@ -1119,7 +1109,7 @@ decision:
  * @tsid: target security identifier
  * @tclass: target security class
  * @requested: requested permissions, interpreted based on @tclass
- * @flags:  AVC_STRICT, AVC_NONBLOCKING, or 0
+ * @flags:  AVC_STRICT or 0
  * @avd: access vector decisions
  *
  * Check the AVC to determine whether the @requested permissions are granted
@@ -1190,26 +1180,7 @@ int avc_has_perm(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass,
 				  &avd);
 
 	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,
-			auditdata, 0);
-	if (rc2)
-		return rc2;
-	return rc;
-}
-
-int avc_has_perm_flags(struct selinux_state *state,
-		       u32 ssid, u32 tsid, u16 tclass, u32 requested,
-		       struct common_audit_data *auditdata,
-		       int flags)
-{
-	struct av_decision avd;
-	int rc, rc2;
-
-	rc = avc_has_perm_noaudit(state, ssid, tsid, tclass, requested,
-				  (flags & MAY_NOT_BLOCK) ? AVC_NONBLOCKING : 0,
-				  &avd);
-
-	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,
-			auditdata, flags);
+			auditdata);
 	if (rc2)
 		return rc2;
 	return rc;