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References: <20220309014705.1265861-1-liupeng256@huawei.com>
In-Reply-To: <20220309014705.1265861-1-liupeng256@huawei.com>
From:   Marco Elver <elver@google.com>
Date:   Wed, 9 Mar 2022 07:12:08 +0100
Message-ID: <CANpmjNMfkUSUEihTc2u_v6fOhHiyNOAOs2QROjCMEROMTbaxLQ@mail.gmail.com>
Subject: Re: [PATCH 0/3] kunit: fix a UAF bug and do some optimization
To:     Peng Liu <liupeng256@huawei.com>
Cc:     brendanhiggins@google.com, glider@google.com, dvyukov@google.com,
        akpm@linux-foundation.org, linux-kselftest@vger.kernel.org,
        kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org,
        kasan-dev@googlegroups.com, linux-mm@kvack.org,
        wangkefeng.wang@huawei.com
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On Wed, 9 Mar 2022 at 02:29, 'Peng Liu' via kasan-dev
<kasan-dev@googlegroups.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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