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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
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@@ -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);