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| author | Marco Elver <elver@google.com> | 2019-07-11 20:53:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-12 11:05:42 -0700 |
| commit | e89692190065c12386bd37272ae8b7d142dd079f (patch) | |
| tree | 0556f4730cc25ad36637c4b9051607c3f6ad5e22 /mm/kasan/kasan.h | |
| parent | b7c3613e685076bad6e5540501d84cc31bb30377 (diff) | |
| download | linux-e89692190065c12386bd37272ae8b7d142dd079f.tar.gz linux-e89692190065c12386bd37272ae8b7d142dd079f.tar.bz2 linux-e89692190065c12386bd37272ae8b7d142dd079f.zip | |
mm/kasan: print frame description for stack bugs
This adds support for printing stack frame description on invalid stack
accesses. The frame description is embedded by the compiler, which is
parsed and then pretty-printed.
Currently, we can only print the stack frame info for accesses to the
task's own stack, but not accesses to other tasks' stacks.
Example of what it looks like:
page dumped because: kasan: bad access detected
addr ffff8880673ef98a is located in stack of task insmod/2008 at offset 106 in frame:
kasan_stack_oob+0x0/0xf5 [test_kasan]
this frame has 2 objects:
[32, 36) 'i'
[96, 106) 'stack_array'
Memory state around the buggy address:
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=198435
Link: http://lkml.kernel.org/r/20190522100048.146841-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan/kasan.h')
| -rw-r--r-- | mm/kasan/kasan.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 3ce956efa0cb..1979db4763e2 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -43,6 +43,11 @@ #define KASAN_ALLOCA_REDZONE_SIZE 32 +/* + * Stack frame marker (compiler ABI). + */ +#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 + /* Don't break randconfig/all*config builds */ #ifndef KASAN_ABI_VERSION #define KASAN_ABI_VERSION 1 |