The patch titled
Subject: mm/kasan: print name of mem[set,cpy,move]() caller in report
has been added to the -mm tree. Its filename is
mm-kasan-print-name-of-mem-caller-in-report.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-kasan-print-name-of-mem-caller-in-report.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-kasan-print-name-of-mem-caller-in-report.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/kasan.c | 64 +++++++++++++++++++++++----------------------
1 file changed, 34 insertions(+), 30 deletions(-)
diff -puN mm/kasan/kasan.c~mm-kasan-print-name-of-mem-caller-in-report mm/kasan/kasan.c
--- a/mm/kasan/kasan.c~mm-kasan-print-name-of-mem-caller-in-report
+++ a/mm/kasan/kasan.c
@@ -273,32 +273,36 @@ static __always_inline bool memory_is_po
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 l
#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 *sr
#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);
}
@@ -698,22 +702,22 @@ void __asan_unregister_globals(struct ka
}
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);
@@ -724,7 +728,7 @@ 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);
@@ -734,7 +738,7 @@ 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);
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
mm-kasan-print-name-of-mem-caller-in-report.patch
mm-kasan-add-api-to-check-memory-regions.patch
x86-kasan-instrument-user-memory-access-api.patch
kasan-tests-add-tests-for-user-memory-access-functions.patch
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