linux-kernel - Re: [PATCHv3] x86/mm: set x32 syscall bit in SET

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Message-ID: <cccc8f91-bd0d-fea0-b9b9-71653be38f61@virtuozzo.com>
Date:   Tue, 28 Mar 2017 14:37:07 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     <linux-kernel@...r.kernel.org>, <0x7f454c46@...il.com>,
        Adam Borowski <kilobyte@...band.pl>, <linux-mm@...ck.org>,
        Andrei Vagin <avagin@...il.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCHv3] x86/mm: set x32 syscall bit in SET_PERSONALITY()

On 03/22/2017 01:21 AM, Thomas Gleixner wrote:
> On Tue, 21 Mar 2017, Dmitry Safonov wrote:
>> v3:
>> - clear x32 syscall flag during x32 -> x86-64 exec() (thanks, HPA).
>
> For correctness sake, this wants to be cleared in the IA32 path as
> well. It's not causing any harm, but ....
>
> I'll amend the patch.

So, just a gentle reminder about this problem.
Should I resend v4 with clearing x32 bit in ia32 path?
Or should I resend with this fixup:
https://lkml.org/lkml/2017/3/22/343

The fixup doesn't look as simple as clearing x32 syscall bit, but I may
be wrong.

-- 
              Dmitry