diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2021-02-24 23:05:21 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-25 00:38:31 +0300 |
| commit | 573a48092313dec7b254d9dbcc2db62167f00456 (patch) | |
| tree | 4ede2ccc41f13f9d5c9bb7a47b73d3293a519024 /mm/kasan | |
| parent | da17e377723f50c7acd019e39cfeeca342415714 (diff) | |
| download | linux-573a48092313dec7b254d9dbcc2db62167f00456.tar.xz | |
kasan: add match-all tag tests
Add 3 new tests for tag-based KASAN modes:
1. Check that match-all pointer tag is not assigned randomly.
2. Check that 0xff works as a match-all pointer tag.
3. Check that there are no match-all memory tags.
Note, that test #3 causes a significant number (255) of KASAN reports
to be printed during execution for the SW_TAGS mode.
[arnd@arndb.de: export kasan_poison]
Link: https://lkml.kernel.org/r/20210125112831.2156212-1-arnd@kernel.org
[akpm@linux-foundation.org: s/EXPORT_SYMBOL_GPL/EXPORT_SYMBOL/, per Andrey]
Link: https://linux-review.googlesource.com/id/I78f1375efafa162b37f3abcb2c5bc2f3955dfd8e
Link: https://lkml.kernel.org/r/da841a5408e2204bf25f3b23f70540a65844e8a4.1610733117.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
| -rw-r--r-- | mm/kasan/kasan.h | 6 | ||||
| -rw-r--r-- | mm/kasan/shadow.c | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 3810e75b8eea..12932186a7f9 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -36,6 +36,12 @@ extern bool kasan_flag_panic __ro_after_init; #define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */ #define KASAN_TAG_MAX 0xFD /* maximum value for random tags */ +#ifdef CONFIG_KASAN_HW_TAGS +#define KASAN_TAG_MIN 0xF0 /* mimimum value for random tags */ +#else +#define KASAN_TAG_MIN 0x00 /* mimimum value for random tags */ +#endif + #ifdef CONFIG_KASAN_GENERIC #define KASAN_FREE_PAGE 0xFF /* page was freed */ #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 38958eb0d653..80adc85d0393 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -89,6 +89,7 @@ void kasan_poison(const void *address, size_t size, u8 value) __memset(shadow_start, value, shadow_end - shadow_start); } +EXPORT_SYMBOL(kasan_poison); void kasan_unpoison(const void *address, size_t size) { |