linux-kernel - [PATCH] can: kvaser_usb: Remove -Warray-bounds exception

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Date:   Thu,  6 Oct 2022 12:20:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Kees Cook <keescook@...omium.org>, linux-can@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: [PATCH] can: kvaser_usb: Remove -Warray-bounds exception

GCC-12 emits false positive -Warray-bounds warnings with
CONFIG_UBSAN_SHIFT (-fsanitize=shift). This is fixed in GCC 13[1],
and there is top-level Makefile logic to remove -Warray-bounds for
known-bad GCC versions staring with commit f0be87c42cbd ("gcc-12: disable
'-Warray-bounds' universally for now").

Remove the local work-around.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105679

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/can/usb/kvaser_usb/Makefile |    5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb/Makefile b/drivers/net/can/usb/kvaser_usb/Makefile
index b20d951a0790..cf260044f0b9 100644
--- a/drivers/net/can/usb/kvaser_usb/Makefile
+++ b/drivers/net/can/usb/kvaser_usb/Makefile
@@ -1,8 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb.o
 kvaser_usb-y = kvaser_usb_core.o kvaser_usb_leaf.o kvaser_usb_hydra.o
-
-# FIXME: temporarily silence -Warray-bounds on non W=1+ builds
-ifndef KBUILD_EXTRA_WARN
-CFLAGS_kvaser_usb_hydra.o += -Wno-array-bounds
-endif