Messages in this thread Patch in this message | | | From | Kees Cook <> | Subject | [PATCH] kasan: test: Silence intentional read overflow warnings | Date | Mon, 15 Nov 2021 16:41:11 -0800 |
| |
As done in commit d73dad4eb5ad ("kasan: test: bypass __alloc_size checks") for __write_overflow warnings, also silence some more cases that trip the __read_overflow warnings seen in 5.16-rc1[1]:
In file included from /kisskb/src/include/linux/string.h:253, from /kisskb/src/include/linux/bitmap.h:10, from /kisskb/src/include/linux/cpumask.h:12, from /kisskb/src/include/linux/mm_types_task.h:14, from /kisskb/src/include/linux/mm_types.h:5, from /kisskb/src/include/linux/page-flags.h:13, from /kisskb/src/arch/arm64/include/asm/mte.h:14, from /kisskb/src/arch/arm64/include/asm/pgtable.h:12, from /kisskb/src/include/linux/pgtable.h:6, from /kisskb/src/include/linux/kasan.h:29, from /kisskb/src/lib/test_kasan.c:10: In function 'memcmp', inlined from 'kasan_memcmp' at /kisskb/src/lib/test_kasan.c:897:2: /kisskb/src/include/linux/fortify-string.h:263:25: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter) 263 | __read_overflow(); | ^~~~~~~~~~~~~~~~~ In function 'memchr', inlined from 'kasan_memchr' at /kisskb/src/lib/test_kasan.c:872:2: /kisskb/src/include/linux/fortify-string.h:277:17: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter) 277 | __read_overflow(); | ^~~~~~~~~~~~~~~~~
[1] http://kisskb.ellerman.id.au/kisskb/buildresult/14660585/log/
Cc: Marco Elver <elver@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: kasan-dev@googlegroups.com Fixes: d73dad4eb5ad ("kasan: test: bypass __alloc_size checks") Signed-off-by: Kees Cook <keescook@chromium.org> --- lib/test_kasan.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 67ed689a0b1b..0643573f8686 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -869,6 +869,7 @@ static void kasan_memchr(struct kunit *test) ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + OPTIMIZER_HIDE_VAR(size); KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = memchr(ptr, '1', size + 1)); @@ -894,6 +895,7 @@ static void kasan_memcmp(struct kunit *test) KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); memset(arr, 0, sizeof(arr)); + OPTIMIZER_HIDE_VAR(size); KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = memcmp(ptr, arr, size+1)); kfree(ptr); -- 2.30.2
| |