diff options
| author | Andrey Konovalov <[email protected]> | 2019-02-20 22:20:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2019-02-21 09:01:00 -0800 |
| commit | 219667c23c68eb3dbc0d5662b9246f28477fe529 (patch) | |
| tree | 39638812a6fd9da34c00cc7465c81035ec09af31 | |
| parent | dc15a8a2543cb9ebe67998eefe2880ce1a20d42e (diff) | |
kasan, slab: fix conflicts with CONFIG_HARDENED_USERCOPY
Similarly to commit 96fedce27e13 ("kasan: make tag based mode work with
CONFIG_HARDENED_USERCOPY"), we need to reset pointer tags in
__check_heap_object() in mm/slab.c before doing any pointer math.
Link: http://lkml.kernel.org/r/9a5c0f958db10e69df5ff9f2b997866b56b7effc.1550602886.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <[email protected]>
Tested-by: Qian Cai <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Evgeniy Stepanov <[email protected]>
Cc: Kostya Serebryany <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/slab.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/slab.c b/mm/slab.c index 78eb8c5bf4e4..c84458281a88 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -4408,6 +4408,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, unsigned int objnr; unsigned long offset; + ptr = kasan_reset_tag(ptr); + /* Find and validate object. */ cachep = page->slab_cache; objnr = obj_to_index(cachep, page, (void *)ptr); |