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* [PATCH] x86: fix fortified memcpy
@ 2017-06-27 15:00 Arnd Bergmann
  0 siblings, 0 replies; only message in thread
From: Arnd Bergmann @ 2017-06-27 15:00 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Daniel Micay, Kees Cook, Arnd Bergmann, Thomas Gleixner,
	Ingo Molnar, H. Peter Anvin, x86, linux-kernel

__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 <>
 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);
 	return __memcpy(to, from, n);

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2017-06-27 15:00 [PATCH] x86: fix fortified memcpy Arnd Bergmann

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