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authorElena Reshetova <elena.reshetova@intel.com>2017-05-02 10:16:04 -0400
committerPaul Moore <paul@paul-moore.com>2017-05-02 10:16:04 -0400
commit9d2378f8c8f1a3fcfab681fd90c139d90dca7b69 (patch)
tree0c11cc5d48fbd6d44c6dd593b8ebdfa07f8adad2 /kernel
parent2173c519d5e912a6e2934bb04255fcd36c1591c8 (diff)
downloadlinux-9d2378f8c8f1a3fcfab681fd90c139d90dca7b69.tar.bz2
audit: convert audit_tree.count from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> [PM: fix subject line, add #include] Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/audit_tree.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 7b44195da81b..5cfd1ea18de0 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -3,13 +3,14 @@
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/kthread.h>
+#include <linux/refcount.h>
#include <linux/slab.h>
struct audit_tree;
struct audit_chunk;
struct audit_tree {
- atomic_t count;
+ refcount_t count;
int goner;
struct audit_chunk *root;
struct list_head chunks;
@@ -77,7 +78,7 @@ static struct audit_tree *alloc_tree(const char *s)
tree = kmalloc(sizeof(struct audit_tree) + strlen(s) + 1, GFP_KERNEL);
if (tree) {
- atomic_set(&tree->count, 1);
+ refcount_set(&tree->count, 1);
tree->goner = 0;
INIT_LIST_HEAD(&tree->chunks);
INIT_LIST_HEAD(&tree->rules);
@@ -91,12 +92,12 @@ static struct audit_tree *alloc_tree(const char *s)
static inline void get_tree(struct audit_tree *tree)
{
- atomic_inc(&tree->count);
+ refcount_inc(&tree->count);
}
static inline void put_tree(struct audit_tree *tree)
{
- if (atomic_dec_and_test(&tree->count))
+ if (refcount_dec_and_test(&tree->count))
kfree_rcu(tree, head);
}