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author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2018-10-27 01:02:34 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-27 02:25:18 +0300 |
commit | 0c96350a2d2f64fe777b444c995f6bb633c5d069 (patch) | |
tree | 84bffc58274336874b81d5f8de99e2011931d44c /lib/test_kasan.c | |
parent | 19a2ca0fb560fd7be7b5293c6b652c6d6078dcde (diff) | |
download | linux-0c96350a2d2f64fe777b444c995f6bb633c5d069.tar.xz |
lib/test_kasan.c: add tests for several string/memory API functions
Arch code may have asm implementation of string/memory API functions
instead of using generic one from lib/string.c. KASAN don't see memory
accesses in asm code, thus can miss many bugs.
E.g. on ARM64 KASAN don't see bugs in memchr(), memcmp(), str[r]chr(),
str[n]cmp(), str[n]len(). Add tests for these functions to be sure that
we notice the problem on other architectures.
Link: http://lkml.kernel.org/r/20180920135631.23833-3-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kyeongdon Kim <kyeongdon.kim@lge.com>
Cc: Mark Rutland <mark.rutland@arm.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 | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index ec657105edbf..51b78405bf24 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -579,6 +579,73 @@ static noinline void __init kmem_cache_invalid_free(void) kmem_cache_destroy(cache); } +static noinline void __init kasan_memchr(void) +{ + char *ptr; + size_t size = 24; + + pr_info("out-of-bounds in memchr\n"); + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + if (!ptr) + return; + + memchr(ptr, '1', size + 1); + kfree(ptr); +} + +static noinline void __init kasan_memcmp(void) +{ + char *ptr; + size_t size = 24; + int arr[9]; + + pr_info("out-of-bounds in memcmp\n"); + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + if (!ptr) + return; + + memset(arr, 0, sizeof(arr)); + memcmp(ptr, arr, size+1); + kfree(ptr); +} + +static noinline void __init kasan_strings(void) +{ + char *ptr; + size_t size = 24; + + pr_info("use-after-free in strchr\n"); + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + if (!ptr) + return; + + kfree(ptr); + + /* + * Try to cause only 1 invalid access (less spam in dmesg). + * For that we need ptr to point to zeroed byte. + * Skip metadata that could be stored in freed object so ptr + * will likely point to zeroed byte. + */ + ptr += 16; + strchr(ptr, '1'); + + pr_info("use-after-free in strrchr\n"); + strrchr(ptr, '1'); + + pr_info("use-after-free in strcmp\n"); + strcmp(ptr, "2"); + + pr_info("use-after-free in strncmp\n"); + strncmp(ptr, "2", 1); + + pr_info("use-after-free in strlen\n"); + strlen(ptr); + + pr_info("use-after-free in strnlen\n"); + strnlen(ptr, 1); +} + static int __init kmalloc_tests_init(void) { /* @@ -618,6 +685,9 @@ static int __init kmalloc_tests_init(void) use_after_scope_test(); kmem_cache_double_free(); kmem_cache_invalid_free(); + kasan_memchr(); + kasan_memcmp(); + kasan_strings(); kasan_restore_multi_shot(multishot); |