x86_64: kasan: add interceptors for memset/memmove/memcpy functions

Recently instrumentation of builtin functions calls was removed from GCC
5.0.  To check the memory accessed by such functions, userspace asan
always uses interceptors for them.

So now we should do this as well.  This patch declares
memset/memmove/memcpy as weak symbols.  In mm/kasan/kasan.c we have our
own implementation of those functions which checks memory before accessing
it.

Default memset/memmove/memcpy now now always have aliases with '__'
prefix.  For files that built without kasan instrumentation (e.g.
mm/slub.c) original mem* replaced (via #define) with prefixed variants,
cause we don't want to check memory accesses there.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrey Konovalov <adech.fo@gmail.com>
Cc: Yuri Gribov <tetra2005@gmail.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 92b9a5f2aed6fcb73e0ac726b8fef95f8d93f6be..ef17683484e9b308e2cb89312258dfe1e62e2d72 100644 (file)
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -13,8 +13,7 @@
 #include <asm/setup.h>
 #include <asm/desc.h>
 
-#undef memcpy                  /* Use memcpy from misc.c */
-
+#include "../string.h"
 #include "eboot.h"
 
 static efi_system_table_t *sys_table;

diff --cc arch/x86/boot/compressed/misc.h
Simple merge

diff --cc arch/x86/include/asm/string_64.h
Simple merge

diff --cc arch/x86/kernel/x8664_ksyms_64.c
Simple merge

diff --cc arch/x86/lib/memcpy_64.S
Simple merge

diff --cc arch/x86/lib/memmove_64.S
Simple merge

diff --cc arch/x86/lib/memset_64.S
Simple merge

diff --cc drivers/firmware/efi/libstub/efistub.h
Simple merge

diff --cc mm/kasan/kasan.c
Simple merge