linux-kernel - [PATCH] ARM: socfpga: Fix crash with CONFIG_FORTIRY

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Date:   Wed, 17 Nov 2021 20:32:44 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        "Ivan T . Ivanov" <iivanov@...e.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: socfpga: Fix crash with CONFIG_FORTIRY_SOURCE

When CONFIG_FORTIFY_SOURCE is set, memcpy() checks the potential
buffer overflow and panics.  The code in sofcpga bootstrapping
contains the memcpy() calls are mistakenly translated as the shorter
size, hence it triggers a panic as if it were overflowing.

This patch adds the __NO_FORTIFY define for avoiding the
false-positive crash.

Buglink: https://bugzilla.suse.com/show_bug.cgi?id=1192473
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---

I took an easier path for now, as the attempt with a foced cast
failed.  If there is a better way to handle, let me know, I'd happily
resubmit.  Thanks!

 arch/arm/mach-socfpga/platsmp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c
index fbb80b883e5d..d46b1af96a8a 100644
--- a/arch/arm/mach-socfpga/platsmp.c
+++ b/arch/arm/mach-socfpga/platsmp.c
@@ -5,6 +5,9 @@
  * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
  * Copyright (C) 2012 Altera Corporation
  */
+
+#define __NO_FORTIFY /* need to avoid the crash with memcpy() calls */
+
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/smp.h>
-- 
2.26.2