linux-kernel - [PATCH] x86: fix fortified memcpy

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Date:   Tue, 27 Jun 2017 17:00:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Daniel Micay <danielmicay@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86: fix fortified memcpy

__memcpy3d is not available when CONFIG_FORTIFY_SOURCE is enabled,
leading to a link error on 32-bit kernels:

arch/x86/lib/memcpy_32.c: In function 'memcpy':
arch/x86/lib/memcpy_32.c:10:9: error: implicit declaration of function '__memcpy3d'; did you mean '__memcpy'? [-Werror=implicit-function-declaration]

This uses the same #ifdef around the use of the function that
now protects the definition.

Fixes: mmotm ("include/linux/string.h: add the option of fortified string.h functions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/lib/memcpy_32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/lib/memcpy_32.c b/arch/x86/lib/memcpy_32.c
index cad12634d6bd..2eab7d0bfedd 100644
--- a/arch/x86/lib/memcpy_32.c
+++ b/arch/x86/lib/memcpy_32.c
@@ -6,7 +6,7 @@
 
 __visible void *memcpy(void *to, const void *from, size_t n)
 {
-#ifdef CONFIG_X86_USE_3DNOW
+#if defined(CONFIG_X86_USE_3DNOW) && !defined(CONFIG_FORTIFY_SOURCE)
 	return __memcpy3d(to, from, n);
 #else
 	return __memcpy(to, from, n);
-- 
2.9.0