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

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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>
This commit is contained in:
Andrey Ryabinin
2015-02-13 14:39:56 -08:00
committed by Linus Torvalds
parent 3f15801cdc
commit 393f203f5f
9 changed files with 74 additions and 11 deletions
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10
arch/x86/lib/memset_64.S
View File

@@ -56,6 +56,8 @@
.Lmemset_e_e:
.previous
.weak memset
ENTRY(memset)
ENTRY(__memset)
CFI_STARTPROC
@@ -147,8 +149,8 @@ ENDPROC(__memset)
* feature to implement the right patch order.
*/
.section .altinstructions,"a"
altinstruction_entry memset,.Lmemset_c,X86_FEATURE_REP_GOOD,\
.Lfinal-memset,.Lmemset_e-.Lmemset_c
altinstruction_entry memset,.Lmemset_c_e,X86_FEATURE_ERMS, \
.Lfinal-memset,.Lmemset_e_e-.Lmemset_c_e
altinstruction_entry __memset,.Lmemset_c,X86_FEATURE_REP_GOOD,\
.Lfinal-__memset,.Lmemset_e-.Lmemset_c
altinstruction_entry __memset,.Lmemset_c_e,X86_FEATURE_ERMS, \
.Lfinal-__memset,.Lmemset_e_e-.Lmemset_c_e
.previous