From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Subject: kasan: adjust kasan_stack_oob for tag-based mode Use OOB_TAG_OFF as access offset to land the access into the next granule. Link: http://lkml.kernel.org/r/403b259f1de49a7a3694531c851ac28326a586a8.1596199677.git.andreyknvl@xxxxxxxxxx Link: http://lkml.kernel.org/r/3063ab1411e92bce36061a96e25b651212e70ba6.1596544734.git.andreyknvl@xxxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Suggested-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Elena Petrova <lenaptr@xxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/test_kasan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/lib/test_kasan.c~kasan-adjust-kasan_stack_oob-for-tag-based-mode +++ a/lib/test_kasan.c @@ -488,7 +488,7 @@ static noinline void __init kasan_global static noinline void __init kasan_stack_oob(void) { char stack_array[10]; - volatile int i = 0; + volatile int i = OOB_TAG_OFF; char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; pr_info("out-of-bounds on stack\n"); _
