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| author | Walter Wu <walter-zh.wu@mediatek.com> | 2020-04-02 06:09:40 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-02 18:35:30 +0200 |
| commit | 98f3b56fa62a61f1d4d6a5fdd035f0b03be1e93f (patch) | |
| tree | 47aa9c7ce87f5260e1f238b7c0e960c70e22aed3 | |
| parent | kasan: detect negative size in memory operation function (diff) | |
| download | linux-98f3b56fa62a61f1d4d6a5fdd035f0b03be1e93f.tar.xz linux-98f3b56fa62a61f1d4d6a5fdd035f0b03be1e93f.zip | |
kasan: add test for invalid size in memmove
Test negative size in memmove in order to verify whether it correctly get
KASAN report.
Casting negative numbers to size_t would indeed turn up as a large size_t,
so it will have out-of-bounds bug and be detected by KASAN.
[walter-zh.wu@mediatek.com: fix -Wstringop-overflow warning]
Link: http://lkml.kernel.org/r/20200311134244.13016-1-walter-zh.wu@mediatek.com
Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: kernel test robot <lkp@intel.com>
Link: http://lkml.kernel.org/r/20191112065313.7060-1-walter-zh.wu@mediatek.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/test_kasan.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 3872d250ed2c..e3087d90e00d 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -285,6 +285,24 @@ static noinline void __init kmalloc_oob_in_memset(void) kfree(ptr); } +static noinline void __init kmalloc_memmove_invalid_size(void) +{ + char *ptr; + size_t size = 64; + volatile size_t invalid_size = -2; + + pr_info("invalid size in memmove\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + memset((char *)ptr, 0, 64); + memmove((char *)ptr, (char *)ptr + 4, invalid_size); + kfree(ptr); +} + static noinline void __init kmalloc_uaf(void) { char *ptr; @@ -799,6 +817,7 @@ static int __init kmalloc_tests_init(void) kmalloc_oob_memset_4(); kmalloc_oob_memset_8(); kmalloc_oob_memset_16(); + kmalloc_memmove_invalid_size(); kmalloc_uaf(); kmalloc_uaf_memset(); kmalloc_uaf2(); |