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| author | Vasily Gorbik <gor@linux.ibm.com> | 2019-08-12 16:52:07 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-08-21 13:58:52 +0300 |
| commit | f45f7b5bdaa4828ce871cf03f7c01599a0de57a5 (patch) | |
| tree | 395de5eef3a5529220a46473ab614bf4de149816 /arch/s390/include | |
| parent | 2e83e0eb85ca62985406920f97ece36d822d421f (diff) | |
| download | linux-f45f7b5bdaa4828ce871cf03f7c01599a0de57a5.tar.xz | |
s390/kasan: provide uninstrumented __strlen
s390 kasan code uses sclp_early_printk to report initialization
failures. The code doing that should not be instrumented, because kasan
shadow memory has not been set up yet. Even though sclp_early_core.c is
compiled with instrumentation disabled it uses strlen function, which
is instrumented and would produce shadow memory access if used. To
avoid that, introduce uninstrumented __strlen function to be used
instead.
Before commit 7e0d92f00246 ("s390/kasan: improve string/memory functions
checks") few string functions (including strlen) were escaping kasan
instrumentation due to usage of platform specific versions which are
implemented in inline assembly.
Fixes: 7e0d92f00246 ("s390/kasan: improve string/memory functions checks")
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/string.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h index 70d87db54e62..4c0690fc5167 100644 --- a/arch/s390/include/asm/string.h +++ b/arch/s390/include/asm/string.h @@ -71,11 +71,16 @@ extern void *__memmove(void *dest, const void *src, size_t n); #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) +#define strlen(s) __strlen(s) + +#define __no_sanitize_prefix_strfunc(x) __##x #ifndef __NO_FORTIFY #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */ #endif +#else +#define __no_sanitize_prefix_strfunc(x) x #endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */ void *__memset16(uint16_t *s, uint16_t v, size_t count); @@ -163,8 +168,8 @@ static inline char *strcpy(char *dst, const char *src) } #endif -#ifdef __HAVE_ARCH_STRLEN -static inline size_t strlen(const char *s) +#if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)) +static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s) { register unsigned long r0 asm("0") = 0; const char *tmp = s; |