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| author | Dmitry Vyukov <dvyukov@google.com> | 2018-02-07 00:36:37 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-07 03:32:43 +0100 |
| commit | b1d5728939ebe01a773a75a72e7161408ec9805e (patch) | |
| tree | 78a5efeeaeefcad39bf62a0af35deea7e1e634c1 /lib | |
| parent | kasan: unify code between kasan_slab_free() and kasan_poison_kfree() (diff) | |
| download | linux-b1d5728939ebe01a773a75a72e7161408ec9805e.tar.xz linux-b1d5728939ebe01a773a75a72e7161408ec9805e.zip | |
kasan: detect invalid frees
Detect frees of pointers into middle of heap objects.
Link: http://lkml.kernel.org/r/cb569193190356beb018a03bb8d6fbae67e7adbc.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 'lib')
| -rw-r--r-- | lib/test_kasan.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index e9c5d765be66..a808d81b409d 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -523,6 +523,54 @@ static noinline void __init kasan_alloca_oob_right(void) *(volatile char *)p; } +static noinline void __init kmem_cache_double_free(void) +{ + char *p; + size_t size = 200; + struct kmem_cache *cache; + + cache = kmem_cache_create("test_cache", size, 0, 0, NULL); + if (!cache) { + pr_err("Cache allocation failed\n"); + return; + } + pr_info("double-free on heap object\n"); + p = kmem_cache_alloc(cache, GFP_KERNEL); + if (!p) { + pr_err("Allocation failed\n"); + kmem_cache_destroy(cache); + return; + } + + kmem_cache_free(cache, p); + kmem_cache_free(cache, p); + kmem_cache_destroy(cache); +} + +static noinline void __init kmem_cache_invalid_free(void) +{ + char *p; + size_t size = 200; + struct kmem_cache *cache; + + cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, + NULL); + if (!cache) { + pr_err("Cache allocation failed\n"); + return; + } + pr_info("invalid-free of heap object\n"); + p = kmem_cache_alloc(cache, GFP_KERNEL); + if (!p) { + pr_err("Allocation failed\n"); + kmem_cache_destroy(cache); + return; + } + + kmem_cache_free(cache, p + 1); + kmem_cache_destroy(cache); +} + static int __init kmalloc_tests_init(void) { /* @@ -560,6 +608,8 @@ static int __init kmalloc_tests_init(void) ksize_unpoisons_memory(); copy_user_test(); use_after_scope_test(); + kmem_cache_double_free(); + kmem_cache_invalid_free(); kasan_restore_multi_shot(multishot); |