[PATCH] lib/test_ubsan: Silence compile-time array bounds warnings

Kees Cook
2021-12-03T09:30:05Z

The UBSAN tests intentionally operate beyond array bounds, so silence
the warning visible with a -Warray-bounds build:

lib/test_ubsan.c: In function 'test_ubsan_object_size_mismatch':
lib/test_ubsan.c:109:16: error: array subscript 'long long int[0]' is partly outside array bounds of 'volatile int[1]' [-Werror=array-bounds]
109 | val2 = *ptr;
| ^~~~
lib/test_ubsan.c:104:22: note: while referencing 'val'
104 | volatile int val __aligned(8) = 4;
| ^~~

Signed-off-by: Kees Cook <keescook@chromium.org>
---
lib/Makefile | 1 +
1 file changed, 1 insertion(+)

diff --git a/lib/Makefile b/lib/Makefile
index 08959b10bac9..2742a54a4275 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_KASAN_MODULE_TEST) += test_kasan_module.o
CFLAGS_test_kasan_module.o += -fno-builtin
obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla)
+CFLAGS_test_ubsan.o += $(call cc-disable-warning, array-bounds)
UBSAN_SANITIZE_test_ubsan.o := y
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
--
2.30.2