linux-kernel - Re: [Xen-devel] [PATCH v2] x86/xen: init %gs very early to avoid page faults with stack protector

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Date:   Thu, 1 Feb 2018 19:36:05 -0500
From:   Chris Patterson <cjp256@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, stable@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v2] x86/xen: init %gs very early to avoid page
 faults with stack protector

Works great, tested it and it fixes booting Linux v4.15 kernel for me :)

Cheers!

On Thu, Feb 1, 2018 at 3:17 PM, Boris Ostrovsky
<boris.ostrovsky@...cle.com> wrote:
> On 02/01/2018 07:40 AM, Juergen Gross wrote:
>> When running as Xen pv guest %gs is initialized some time after
>> C code is started. Depending on stack protector usage this might be
>> too late, resulting in page faults.
>>
>> So setup %gs and MSR_GS_BASE in assembly code already.
>>
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-devel

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