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| author | Andrey Konovalov <andreyknvl@google.com> | 2021-04-09 23:27:38 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-10 00:54:23 +0300 |
| commit | 06b1f85588948bd4c772845e5d6891b8f6082248 (patch) | |
| tree | cfe4931b5eaa039a84cee63bb271ce21c1eb5b87 | |
| parent | df41872b68601059dd4a84858952dcae58acd331 (diff) | |
| download | linux-06b1f85588948bd4c772845e5d6891b8f6082248.tar.xz | |
kasan: fix conflict with page poisoning
When page poisoning is enabled, it accesses memory that is marked as
poisoned by KASAN, which leas to false-positive KASAN reports.
Suppress the reports by adding KASAN annotations to unpoison_page()
(poison_page() already has them).
Link: https://lkml.kernel.org/r/2dc799014d31ac13fd97bd906bad33e16376fc67.1617118501.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_poison.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_poison.c b/mm/page_poison.c index 65cdf844c8ad..655dc5895604 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -77,12 +77,14 @@ static void unpoison_page(struct page *page) void *addr; addr = kmap_atomic(page); + kasan_disable_current(); /* * Page poisoning when enabled poisons each and every page * that is freed to buddy. Thus no extra check is done to * see if a page was poisoned. */ - check_poison_mem(addr, PAGE_SIZE); + check_poison_mem(kasan_reset_tag(addr), PAGE_SIZE); + kasan_enable_current(); kunmap_atomic(addr); } |