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

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Date:   Fri,  3 Dec 2021 01:30:00 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Marco Elver <elver@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] lib/test_ubsan: Silence compile-time array bounds warnings

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@...omium.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