linux-kernel - Re: [PATCH 0/3] kunit: fix a UAF bug and do some optimization

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Date:   Wed, 9 Mar 2022 14:39:19 +0800
From:   "liupeng (DM)" <liupeng256@...wei.com>
To:     Marco Elver <elver@...gle.com>
CC:     <brendanhiggins@...gle.com>, <glider@...gle.com>,
        <dvyukov@...gle.com>, <akpm@...ux-foundation.org>,
        <linux-kselftest@...r.kernel.org>, <kunit-dev@...glegroups.com>,
        <linux-kernel@...r.kernel.org>, <kasan-dev@...glegroups.com>,
        <linux-mm@...ck.org>, <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH 0/3] kunit: fix a UAF bug and do some optimization

Good, I will send a revised series latter.

On 2022/3/9 14:12, Marco Elver wrote:
> On Wed, 9 Mar 2022 at 02:29, 'Peng Liu' via kasan-dev
> <kasan-dev@...glegroups.com> wrote:
>> This series is to fix UAF when running kfence test case test_gfpzero,
>> which is time costly. This UAF bug can be easily triggered by setting
>> CONFIG_KFENCE_DYNAMIC_OBJECTS = 65535. Furthermore, some optimization
>> for kunit tests has been done.
> Yeah, I've observed this problem before, so thanks for fixing.
>
> It's CONFIG_KFENCE_NUM_OBJECTS (not "DYNAMIC") - please fix in all patches.
>
Sorry for this mistake, I will check it in all patches.
>> Peng Liu (3):
>>    kunit: fix UAF when run kfence test case test_gfpzero
>>    kunit: make kunit_test_timeout compatible with comment
>>    kfence: test: try to avoid test_gfpzero trigger rcu_stall
>>
>>   lib/kunit/try-catch.c   | 3 ++-
>>   mm/kfence/kfence_test.c | 3 ++-
>>   2 files changed, 4 insertions(+), 2 deletions(-)
>>
>> --
>> 2.18.0.huawei.25
>>
>> --
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> .