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

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Date:   Wed, 9 Mar 2022 07:12:08 +0100
From:   Marco Elver <elver@...gle.com>
To:     Peng Liu <liupeng256@...wei.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

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.


> 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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