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authorAndrey Ryabinin2016-05-20 16:59:20 -0700
committerLinus Torvalds2016-05-20 17:58:30 -0700
commit936bb4bbbb832f81055328b84e5afe1fc7246a8d (patch)
treef61b89546b9403246b7d0eebc7f87e41d54860ce /mm
parent96fe805fb6fe9b2ed12fc54ad0e3e6829a4152cb (diff)
mm/kasan: print name of mem[set,cpy,move]() caller in report
When bogus memory access happens in mem[set,cpy,move]() it's usually caller's fault. So don't blame mem[set,cpy,move]() in bug report, blame the caller instead. Before: BUG: KASAN: out-of-bounds access in memset+0x23/0x40 at <address> After: BUG: KASAN: out-of-bounds access in <memset_caller> at <address> Link: http://lkml.kernel.org/r/1462538722-1574-2-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Acked-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/kasan.c64
1 files changed, 34 insertions, 30 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 8df666bb23be..e5beb40d97b1 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -273,32 +273,36 @@ static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
return memory_is_poisoned_n(addr, size);
}
-
-static __always_inline void check_memory_region(unsigned long addr,
- size_t size, bool write)
+static __always_inline void check_memory_region_inline(unsigned long addr,
+ size_t size, bool write,
+ unsigned long ret_ip)
{
if (unlikely(size == 0))
return;
if (unlikely((void *)addr <
kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
- kasan_report(addr, size, write, _RET_IP_);
+ kasan_report(addr, size, write, ret_ip);
return;
}
if (likely(!memory_is_poisoned(addr, size)))
return;
- kasan_report(addr, size, write, _RET_IP_);
+ kasan_report(addr, size, write, ret_ip);
}
-void __asan_loadN(unsigned long addr, size_t size);
-void __asan_storeN(unsigned long addr, size_t size);
+static void check_memory_region(unsigned long addr,
+ size_t size, bool write,
+ unsigned long ret_ip)
+{
+ check_memory_region_inline(addr, size, write, ret_ip);
+}
#undef memset
void *memset(void *addr, int c, size_t len)
{
- __asan_storeN((unsigned long)addr, len);
+ check_memory_region((unsigned long)addr, len, true, _RET_IP_);
return __memset(addr, c, len);
}
@@ -306,8 +310,8 @@ void *memset(void *addr, int c, size_t len)
#undef memmove
void *memmove(void *dest, const void *src, size_t len)
{
- __asan_loadN((unsigned long)src, len);
- __asan_storeN((unsigned long)dest, len);
+ check_memory_region((unsigned long)src, len, false, _RET_IP_);
+ check_memory_region((unsigned long)dest, len, true, _RET_IP_);
return __memmove(dest, src, len);
}
@@ -315,8 +319,8 @@ void *memmove(void *dest, const void *src, size_t len)
#undef memcpy
void *memcpy(void *dest, const void *src, size_t len)
{
- __asan_loadN((unsigned long)src, len);
- __asan_storeN((unsigned long)dest, len);
+ check_memory_region((unsigned long)src, len, false, _RET_IP_);
+ check_memory_region((unsigned long)dest, len, true, _RET_IP_);
return __memcpy(dest, src, len);
}
@@ -690,22 +694,22 @@ void __asan_unregister_globals(struct kasan_global *globals, size_t size)
}
EXPORT_SYMBOL(__asan_unregister_globals);
-#define DEFINE_ASAN_LOAD_STORE(size) \
- void __asan_load##size(unsigned long addr) \
- { \
- check_memory_region(addr, size, false); \
- } \
- EXPORT_SYMBOL(__asan_load##size); \
- __alias(__asan_load##size) \
- void __asan_load##size##_noabort(unsigned long); \
- EXPORT_SYMBOL(__asan_load##size##_noabort); \
- void __asan_store##size(unsigned long addr) \
- { \
- check_memory_region(addr, size, true); \
- } \
- EXPORT_SYMBOL(__asan_store##size); \
- __alias(__asan_store##size) \
- void __asan_store##size##_noabort(unsigned long); \
+#define DEFINE_ASAN_LOAD_STORE(size) \
+ void __asan_load##size(unsigned long addr) \
+ { \
+ check_memory_region_inline(addr, size, false, _RET_IP_);\
+ } \
+ EXPORT_SYMBOL(__asan_load##size); \
+ __alias(__asan_load##size) \
+ void __asan_load##size##_noabort(unsigned long); \
+ EXPORT_SYMBOL(__asan_load##size##_noabort); \
+ void __asan_store##size(unsigned long addr) \
+ { \
+ check_memory_region_inline(addr, size, true, _RET_IP_); \
+ } \
+ EXPORT_SYMBOL(__asan_store##size); \
+ __alias(__asan_store##size) \
+ void __asan_store##size##_noabort(unsigned long); \
EXPORT_SYMBOL(__asan_store##size##_noabort)
DEFINE_ASAN_LOAD_STORE(1);
@@ -716,7 +720,7 @@ DEFINE_ASAN_LOAD_STORE(16);
void __asan_loadN(unsigned long addr, size_t size)
{
- check_memory_region(addr, size, false);
+ check_memory_region(addr, size, false, _RET_IP_);
}
EXPORT_SYMBOL(__asan_loadN);
@@ -726,7 +730,7 @@ EXPORT_SYMBOL(__asan_loadN_noabort);
void __asan_storeN(unsigned long addr, size_t size)
{
- check_memory_region(addr, size, true);
+ check_memory_region(addr, size, true, _RET_IP_);
}
EXPORT_SYMBOL(__asan_storeN);