linux-kernel - Re: [Latest Git kernel/Linux-next kernel] Xorg doesn't start after the seccomp updates v5.9-rc1

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Message-Id: <B13B4293-8DF4-4FC7-A48F-60A5A9121B61@xenosoft.de>
Date:   Fri, 7 Aug 2020 21:12:08 +0200
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "R.T.Dickinson" <rtd2@...a.co.nz>,
        Darren Stevens <darren@...vens-zone.net>,
        mad skateman <madskateman@...il.com>
Subject: Re: [Latest Git kernel/Linux-next kernel] Xorg doesn't start after the seccomp updates v5.9-rc1

Hi Kees,

Thanks a lot for your patch! I think your patch works because I can patch the Git source code but the kernel doesn’t boot. In my point of view your modifications aren’t responsible for this second issue. The kernel can’t initialize the graphics card anymore. I think the latest DRM updates are responsible for the second issue. Because of this second issue I can’t test your patch.

Please test the latest Git kernel.

Thanks,
Christian

> On 7. Aug 2020, at 19:45, Kees Cook <keescook@...omium.org> wrote:
> 
> On Fri, Aug 07, 2020 at 04:45:14PM +0200, Christian Zigotzky wrote:
>> But Xorg works on Ubuntu 10.04.4 (PowerPC 32-bit), openSUSE Tumbleweed
>> 20190722 PPC64 and on Fedora 27 PPC64 with the latest Git kernel.
>> 
>> I bisected today [4].
>> 
>> Result: net/scm: Regularize compat handling of scm_detach_fds()
>> (c0029de50982c1fb215330a5f9d433cec0cfd8cc) [5] is the first bad commit.
>> 
>> This commit has been merged with the seccomp updates v5.9-rc1 on 2020-08-04
>> 14:11:08 -0700 [1]. Since these updates, Xorg doesn't start anymore on some
>> Linux distributions.
> 
> Hi! Thanks for bisecting; yes, sorry for the trouble (I'm still trying
> to understand why my compat tests _passed_...). Regardless, can you try
> this patch:
> 
> https://lore.kernel.org/lkml/20200807173609.GJ4402@mussarela/
> 
> -- 
> Kees Cook