linux-kernel - Re: [PATCH 2/2] selftests/lkdtm: add config

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Date:   Mon, 4 Apr 2022 12:50:01 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     usama.anjum@...labora.com, Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...labora.com, kernelci@...ups.io,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] selftests/lkdtm: add config

Hi Kees,

Any thoughts?

On 3/15/22 4:55 PM, Muhammad Usama Anjum wrote:
> On 3/10/22 10:22 PM, Muhammad Usama Anjum wrote:
>> On 3/10/22 12:23 AM, Kees Cook wrote:
>>> On Fri, Feb 18, 2022 at 01:56:20AM +0500, Muhammad Usama Anjum wrote:
>>>> Add config option which is needed for SLAB_LINEAR_OVERFLOW test. It
>>>> needs KASAN enabled.
>>>
>>> I'd prefer this use the SLAB_DEBUG options -- KASAN is very heavy.
>> I'll test it out and update in the next patch version.
>> I've tested by removing KASAN and adding the following config:
> CONFIG_SLAB=y
> CONFIG_DEBUG_SLAB=y
> 
> The result of SLAB_LINEAR_OVERFLOW test doesn't remain deterministic in
> this config. The task never crashes and hence stack trace never appears.
> When executed several times we get "Slab corruption" logs and after some
> more tries whole kernel crashes. I've not used DEBUG_SLAB before and not
> sure if this is the expected behavior. If we aren't sure, we can keep
> KASAN turned on instead.
> 

-- 
Muhammad Usama Anjum