linux/mm/kasan
Yee Lee 77a63c69ec 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>
2021-07-15 10:13:49 -07:00
..
common.c Merge branch 'akpm' (patches from Andrew) 2021-06-29 17:29:11 -07:00
generic.c kasan: allow architectures to provide an outline readiness check 2021-06-29 10:53:53 -07:00
hw_tags.c Merge branch 'akpm' (patches from Andrew) 2021-06-29 17:29:11 -07:00
init.c kasan: use MAX_PTRS_PER_* for early shadow tables 2021-06-29 10:53:53 -07:00
kasan.h kasan: add memzero init for unaligned size at DEBUG 2021-07-15 10:13:49 -07:00
Makefile kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
quarantine.c mm: fix typos in comments 2021-05-07 00:26:35 -07:00
report.c kasan: use dump_stack_lvl(KERN_ERR) to print stacks 2021-06-29 10:53:52 -07:00
report_generic.c mm/kasan: switch from strlcpy to strscpy 2021-04-30 11:20:41 -07:00
report_hw_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
report_sw_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
report_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
shadow.c kasan: allow architectures to provide an outline readiness check 2021-06-29 10:53:53 -07:00
sw_tags.c Merge branch 'akpm' (patches from Andrew) 2021-06-29 17:29:11 -07:00
tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00