linux-hardening - [PATCH 4/5] Makefile: Enable -Warray-bounds

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Date:   Wed, 18 Aug 2021 01:11:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        clang-built-linux@...glegroups.com, linux-hardening@...r.kernel.org
Subject: [PATCH 4/5] Makefile: Enable -Warray-bounds

With the recent fixes for flexible arrays and expanded FORTIFY_SOURCE
coverage, it is now possible to enable -Warray-bounds. Since both
GCC and Clang include -Warray-bounds in -Wall, we just need to stop
disabling it.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org
Co-developed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 Makefile | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Makefile b/Makefile
index a4aca01a4835..af22b83cede7 100644
--- a/Makefile
+++ b/Makefile
@@ -1072,7 +1072,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
-KBUILD_CFLAGS += -Wno-array-bounds
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 
 # Another good warning that we'll want to enable eventually
-- 
2.30.2