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authorJan Kara <jack@suse.cz>2018-11-12 15:54:49 +0100
committerPaul Moore <paul@paul-moore.com>2018-11-12 15:54:49 +0100
commita8375713fb1ff28ec718b601895958f1db775774 (patch)
tree3d9db1409ae6358e3ec2aed64dd426f6dbab929e /kernel/audit_tree.c
parentaudit: Remove pointless check in insert_hash() (diff)
downloadlinux-a8375713fb1ff28ec718b601895958f1db775774.tar.xz
linux-a8375713fb1ff28ec718b601895958f1db775774.zip
audit: Provide helper for dropping mark's chunk reference
Provide a helper function audit_mark_put_chunk() for dropping mark's reference (which has to happen only after RCU grace period expires). Currently that happens only from a single place but in later patches we introduce more callers. Reviewed-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel/audit_tree.c')
-rw-r--r--kernel/audit_tree.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index d150514ff15e..35c031ebcc12 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -132,10 +132,20 @@ static void __put_chunk(struct rcu_head *rcu)
audit_put_chunk(chunk);
}
+/*
+ * Drop reference to the chunk that was held by the mark. This is the reference
+ * that gets dropped after we've removed the chunk from the hash table and we
+ * use it to make sure chunk cannot be freed before RCU grace period expires.
+ */
+static void audit_mark_put_chunk(struct audit_chunk *chunk)
+{
+ call_rcu(&chunk->head, __put_chunk);
+}
+
static void audit_tree_destroy_watch(struct fsnotify_mark *entry)
{
struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);
- call_rcu(&chunk->head, __put_chunk);
+ audit_mark_put_chunk(chunk);
}
static struct audit_chunk *alloc_chunk(int count)