From: Kees Cook <keesc...@chromium.org> commit cab71f7495f7aa639ca4b8508f4c3e426e9cb2f7 upstream.
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 include/linux/string.h:253, from include/linux/bitmap.h:10, from include/linux/cpumask.h:12, from include/linux/mm_types_task.h:14, from include/linux/mm_types.h:5, from include/linux/page-flags.h:13, from arch/arm64/include/asm/mte.h:14, from arch/arm64/include/asm/pgtable.h:12, from include/linux/pgtable.h:6, from include/linux/kasan.h:29, from lib/test_kasan.c:10: In function 'memcmp', inlined from 'kasan_memcmp' at lib/test_kasan.c:897:2: 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 lib/test_kasan.c:872:2: 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/ Link: https://lkml.kernel.org/r/20211116004111.3171781-1-keesc...@chromium.org Fixes: d73dad4eb5ad ("kasan: test: bypass __alloc_size checks") Signed-off-by: Kees Cook <keesc...@chromium.org> Reviewed-by: Andrey Konovalov <andreyk...@gmail.com> Acked-by: Marco Elver <el...@google.com> Cc: Andrey Ryabinin <ryabinin....@gmail.com> Cc: Alexander Potapenko <gli...@google.com> Cc: Dmitry Vyukov <dvyu...@google.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com> --- lib/test_kasan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 5475fe396ff7..de300ab98096 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); -- 2.17.1
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