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| author |   Alexander Potapenko <glider@google.com> | 2016-05-20 16:59:17 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-20 17:58:30 -0700 |
| commit | 96fe805fb6fe9b2ed12fc54ad0e3e6829a4152cb (patch) | |
| tree | 9409e7589b867c2919d7dbcd277d5d5f3ae9a656 /lib/test_kasan.c | |
| parent | mm, kasan: don't call kasan_krealloc() from ksize(). (diff) | |
| download | linux-dev-96fe805fb6fe9b2ed12fc54ad0e3e6829a4152cb.tar.xz linux-dev-96fe805fb6fe9b2ed12fc54ad0e3e6829a4152cb.zip | |
mm, kasan: add a ksize() test
Add a test that makes sure ksize() unpoisons the whole chunk.
Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Konstantin Serebryany <kcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/test_kasan.c')
| -rw-r--r-- | lib/test_kasan.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 82169fbf2453..48e5a0be655c 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -344,6 +344,25 @@ static noinline void __init kasan_stack_oob(void) *(volatile char *)p; } +static noinline void __init ksize_unpoisons_memory(void) +{ + char *ptr; + size_t size = 123, real_size = size; + + pr_info("ksize() unpoisons the whole allocated chunk\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + real_size = ksize(ptr); + /* This access doesn't trigger an error. */ + ptr[size] = 'x'; + /* This one does. */ + ptr[real_size] = 'y'; + kfree(ptr); +} + static int __init kmalloc_tests_init(void) { kmalloc_oob_right(); @@ -367,6 +386,7 @@ static int __init kmalloc_tests_init(void) kmem_cache_oob(); kasan_stack_oob(); kasan_global_oob(); + ksize_unpoisons_memory(); return -EAGAIN; } |