linux-kernel - Re: seccomp ptrace selftest failures with 4.4-stable [Was: Re: LTS testing with latest kselftests

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Message-ID: <334e6a92-2d41-c9e1-c807-19e493f1af83@kernel.org>
Date:   Thu, 22 Jun 2017 11:09:38 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Kees Cook <keescook@...omium.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Brian Norris <computersforpeace@...il.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Shuah Khan <shuahkh@....samsung.com>
Subject: Re: seccomp ptrace selftest failures with 4.4-stable [Was: Re: LTS
 testing with latest kselftests - some failures]

On 06/22/2017 10:53 AM, Kees Cook wrote:
> On Thu, Jun 22, 2017 at 9:18 AM, Sumit Semwal <sumit.semwal@...aro.org> wrote:
>> Hi Kees, Andy,
>>
>> On 15 June 2017 at 23:26, Sumit Semwal <sumit.semwal@...aro.org> wrote:
>>> 3. 'seccomp ptrace hole closure' patches got added in 4.7 [3] -
>>> feature and test together.
>>> - This one also seems like a security hole being closed, and the
>>> 'feature' could be a candidate for stable backports, but Arnd tried
>>> that, and it was quite non-trivial. So perhaps  we'll need some help
>>> from the subsystem developers here.
>>
>> Could you please help us sort this out? Our goal is to help Greg with
>> testing stable kernels, and currently the seccomp tests fail due to
>> missing feature (seccomp ptrace hole closure) getting tested via
>> latest kselftest.
>>
>> If you feel the feature isn't a stable candidate, then could you
>> please help make the test degrade gracefully in its absence?
> 
> I don't really want to have that change be a backport -- it's quite
> invasive across multiple architectures.
> 
> I would say just add a kernel version check to the test. This is
> probably not the only selftest that will need such things. :)

Adding release checks to selftests is going to problematic for maintenance.
Tests should fail gracefully if feature isn't supported in older kernels.

Several tests do that now and please find a way to check for dependencies
and feature availability and fail the test gracefully. If there is a test
that can't do that for some reason, we can discuss it, but as a general
rule, I don't want to see kselftest patches that check release.

thanks,
-- Shuah