Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.9 14/24] kasan, slab: fix conflicts with CONFIG_HARDENED_USERCOPY | Date | Wed, 13 Mar 2019 15:16:37 -0400 |
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From: Andrey Konovalov <andreyknvl@google.com>
[ Upstream commit 219667c23c68eb3dbc0d5662b9246f28477fe529 ]
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 <andreyknvl@google.com> Tested-by: Qian Cai <cai@lca.pw> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgeniy Stepanov <eugenis@google.com> Cc: Kostya Serebryany <kcc@google.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- mm/slab.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/mm/slab.c b/mm/slab.c index 354a09deecff..b30b58de793b 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -4461,6 +4461,8 @@ const char *__check_heap_object(const void *ptr, unsigned long n, 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); -- 2.19.1
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