[PATCH v2 0/1] kasan: fix redzone overwritten issue under SLUB debug

yee.lee at mediatek.com yee.lee at mediatek.com
Thu Jun 24 04:26:20 PDT 2021

From: Yee Lee <yee.lee at mediatek.com>

Issue: In SLUB debug, hwtag kasan_unpoison() would overwrite the redzone
 in those objects with unaligned size.

This patch Adds memzero_explict() to separate the initialization for
such condition. The new code path is executed about 1.1% during nromal
booting process.

Exp: QEMUv5.2(+mte)/SLUB_debug mode
code path exec : 941/80854 (1.1%)

Changed since v1:
 - Apply IS_ENABLED to wrap codes under SLUB debug mode.
 - Replace memset() by memzero_explict().


Yee Lee (1):
  kasan: Add memzero init for unaligned size under SLUB debug

 mm/kasan/kasan.h | 6 ++++++
 1 file changed, 6 insertions(+)


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