linux-kernel - Re: [PATCHv5 21/37] x86/vdso: Restrict splitting VVAR VMA

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Message-ID: <CALCETrW4YpndyXHLxCuBSaXX2V9UYNs3d6kLv1MS-vt0FxOvAw@mail.gmail.com>
Date:   Wed, 31 Jul 2019 22:23:48 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Adrian Reber <adrian@...as.de>,
        Andrei Vagin <avagin@...nvz.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jann Horn <jannh@...gle.com>, Jeff Dike <jdike@...toit.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        criu@...nvz.org, Linux API <linux-api@...r.kernel.org>,
        X86 ML <x86@...nel.org>
Subject: Re: [PATCHv5 21/37] x86/vdso: Restrict splitting VVAR VMA

On Mon, Jul 29, 2019 at 2:58 PM Dmitry Safonov <dima@...sta.com> wrote:
>
> Although, time namespace can work with VVAR VMA split, it seems worth
> to forbid splitting VVAR resulting in stricter ABI and reducing amount
> of corner-cases to consider while working further on VDSO.
>
> I don't think there is any use-case for partial mremap() of vvar,
> but if there is any - this patch can be easily reverted.

Seems reasonable to me.