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13 June 2022, 11:31:42 UTC
Revision 77a63c69ec43f4dc28f4b2d1c933c39e55de6ad8 authored by Yee Lee on 15 July 2021, 04:26:37 UTC, committed by Linus Torvalds on 15 July 2021, 17:13:49 UTC 
kasan: add memzero init for unaligned size at DEBUG
 
Issue: when SLUB debug is on, hwtag kasan_unpoison() would overwrite the
redzone of object with unaligned size.

An additional memzero_explicit() path is added to replacing init by hwtag
instruction for those unaligned size at SLUB debug mode.

The penalty is acceptable since they are only enabled in debug mode, not
production builds.  A block of comment is added for explanation.

Link: https://lkml.kernel.org/r/20210705103229.8505-3-yee.lee@mediatek.com
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Suggested-by: Andrey Konovalov <andreyknvl@gmail.com>
Suggested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Nicholas Tang <nicholas.tang@mediatek.com>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 0d4a062
History
Tip revision: 77a63c69ec43f4dc28f4b2d1c933c39e55de6ad8 authored by Yee Lee on 15 July 2021, 04:26:37 UTC
kasan: add memzero init for unaligned size at DEBUG
Tip revision: 77a63c6
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