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s390/kasan: replace some memory functions

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Follow the common kasan approach:

    "KASan replaces memory functions with manually instrumented
    variants.  Original functions declared as weak symbols so strong
    definitions in mm/kasan/kasan.c could replace them. Original
    functions have aliases with '__' prefix in name, so we could call
    non-instrumented variant if needed."

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2017-11-17 13:17:24 +01:00 • committed by Martin Schwidefsky
parent 0a9b40911b
commit fb594ec13e
2 changed files with 30 additions and 3 deletions
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21
arch/s390/include/asm/string.h
View file

@ -53,6 +53,27 @@ char *strstr(const char *s1, const char *s2);
#undef __HAVE_ARCH_STRSEP
#undef __HAVE_ARCH_STRSPN
#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
extern void *__memcpy(void *dest, const void *src, size_t n);
extern void *__memset(void *s, int c, size_t n);
extern void *__memmove(void *dest, const void *src, size_t n);
/*
* For files that are not instrumented (e.g. mm/slub.c) we
* should use not instrumented version of mem* functions.
*/
#define memcpy(dst, src, len) __memcpy(dst, src, len)
#define memmove(dst, src, len) __memmove(dst, src, len)
#define memset(s, c, n) __memset(s, c, n)
#ifndef __NO_FORTIFY
#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
#endif
#endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */
void *__memset16(uint16_t *s, uint16_t v, size_t count);
void *__memset32(uint32_t *s, uint32_t v, size_t count);
void *__memset64(uint64_t *s, uint64_t v, size_t count);

12
arch/s390/lib/mem.S
View file

@ -14,7 +14,8 @@
/*
* void *memmove(void *dest, const void *src, size_t n)
*/
ENTRY(memmove)
WEAK(memmove)
ENTRY(__memmove)
ltgr %r4,%r4
lgr %r1,%r2
jz .Lmemmove_exit
@ -47,6 +48,7 @@ ENTRY(memmove)
BR_EX %r14
.Lmemmove_mvc:
mvc 0(1,%r1),0(%r3)
ENDPROC(__memmove)
EXPORT_SYMBOL(memmove)
/*
@ -64,7 +66,8 @@ EXPORT_SYMBOL(memmove)
* return __builtin_memset(s, c, n);
* }
*/
ENTRY(memset)
WEAK(memset)
ENTRY(__memset)
ltgr %r4,%r4
jz .Lmemset_exit
ltgr %r3,%r3
@ -108,6 +111,7 @@ ENTRY(memset)
xc 0(1,%r1),0(%r1)
.Lmemset_mvc:
mvc 1(1,%r1),0(%r1)
ENDPROC(__memset)
EXPORT_SYMBOL(memset)
/*
@ -115,7 +119,8 @@ EXPORT_SYMBOL(memset)
*
* void *memcpy(void *dest, const void *src, size_t n)
*/
ENTRY(memcpy)
WEAK(memcpy)
ENTRY(__memcpy)
ltgr %r4,%r4
jz .Lmemcpy_exit
aghi %r4,-1
@ -136,6 +141,7 @@ ENTRY(memcpy)
j .Lmemcpy_remainder
.Lmemcpy_mvc:
mvc 0(1,%r1),0(%r3)
ENDPROC(__memcpy)
EXPORT_SYMBOL(memcpy)
/*