linux-hardening - [PATCH 5/5] Makefile: Enable -Wzero-length-bounds

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Message-Id: <20210818081118.1667663-6-keescook@chromium.org>
Date:   Wed, 18 Aug 2021 01:11:18 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-hardening@...r.kernel.org
Subject: [PATCH 5/5] Makefile: Enable -Wzero-length-bounds

With all known internal zero-length accesses fixed, it is possible to
enable -Wzero-length-bounds globally. Since this is included by default
in -Warray-bounds, we just need to stop disabling it.

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

diff --git a/Makefile b/Makefile
index af22b83cede7..3b6fb740584e 100644
--- a/Makefile
+++ b/Makefile
@@ -1071,7 +1071,6 @@ KBUILD_CFLAGS += -Wno-pointer-sign
 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 += $(call cc-disable-warning, stringop-overflow)
 
 # Another good warning that we'll want to enable eventually
-- 
2.30.2