linux-kernel - [PATCH v3 0/1] Fix object remain in offline per-cpu quarantine

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Date:   Wed, 2 Dec 2020 15:53:04 +0800
From:   Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nicholas Tang <nicholas.tang@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>
CC:     <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Subject: [PATCH v3 0/1] Fix object remain in offline per-cpu quarantine

This patch fixes object remain in the offline per-cpu quarantine as
describe below.

Free objects will get into per-cpu quarantine if enable generic KASAN.
If a cpu is offline and users use kmem_cache_destroy, kernel will detect
objects still remain in the offline per-cpu quarantine and report error.

Register a cpu hotplug function to remove all objects in the offline
per-cpu quarantine when cpu is going offline. Set a per-cpu variable
to indicate this cpu is offline.

Changes since v3:
 - Add a barrier to ensure the ordering
 - Rename the init function

Changes since v2:
 - Thanks for Dmitry suggestion
 - Remove unnecessary code
 - Put offline variable into cpu_quarantine
 - Use single qlist_free_all call instead of iteration over all slabs
 - Add bug reporter in commit message

Kuan-Ying Lee (1):
  kasan: fix object remain in offline per-cpu quarantine

 mm/kasan/quarantine.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

-- 
2.18.0