diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2019-01-08 15:23:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-08 17:15:11 -0800 |
| commit | 96fedce27e1356a2fff1c270710d9405848db562 (patch) | |
| tree | 740a5d338824604bc88f4faa6398a17e8a8f0204 | |
| parent | eb214f2dda31ffa989033b1e0f848ba0d3cb6188 (diff) | |
kasan: make tag based mode work with CONFIG_HARDENED_USERCOPY
With CONFIG_HARDENED_USERCOPY enabled __check_heap_object() compares and
then subtracts a potentially tagged pointer with a non-tagged address of
the page that this pointer belongs to, which leads to unexpected
behavior.
Untag the pointer in __check_heap_object() before doing any of these
operations.
Link: http://lkml.kernel.org/r/7e756a298d514c4482f52aea6151db34818d395d.1546540962.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/slub.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c index 36c0befeebd8..1e3d0ec4e200 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3846,6 +3846,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, unsigned int offset; size_t object_size; + ptr = kasan_reset_tag(ptr); + /* Find object and usable object size. */ s = page->slab_cache; |