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authorDmitry Vyukov <dvyukov@google.com>2018-02-07 02:36:23 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-07 05:32:42 +0300
commit47adccce3e8a31d315f47183ab1185862b2fc5d4 (patch)
treeaaf982ef67484b702b42440b459cfd648e58dc4e /mm/kasan/kasan.h
parentd321599cf6b861beefe92327476b617435c7fc4a (diff)
downloadlinux-47adccce3e8a31d315f47183ab1185862b2fc5d4.tar.xz
kasan: detect invalid frees for large objects
Patch series "kasan: detect invalid frees". KASAN detects double-frees, but does not detect invalid-frees (when a pointer into a middle of heap object is passed to free). We recently had a very unpleasant case in crypto code which freed an inner object inside of a heap allocation. This left unnoticed during free, but totally corrupted heap and later lead to a bunch of random crashes all over kernel code. Detect invalid frees. This patch (of 5): Detect frees of pointers into middle of large heap objects. I dropped const from kasan_kfree_large() because it starts propagating through a bunch of functions in kasan_report.c, slab/slub nearest_obj(), all of their local variables, fixup_red_left(), etc. Link: http://lkml.kernel.org/r/1b45b4fe1d20fc0de1329aab674c1dd973fee723.1514378558.git.dvyukov@google.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>a Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan/kasan.h')
-rw-r--r--mm/kasan/kasan.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 9a768dd71c51..bf353a18c908 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -107,8 +107,7 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
void kasan_report(unsigned long addr, size_t size,
bool is_write, unsigned long ip);
-void kasan_report_double_free(struct kmem_cache *cache, void *object,
- void *ip);
+void kasan_report_invalid_free(void *object, void *ip);
#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);