linux-kernel - Re: [PATCH 2/2] x86/vdso: set vdso pointer only after success

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Message-ID: <CALCETrW=qxgd3UpimGFCjHLVb1sgRjqOE1KNps=CT4cmVo7B_w@mail.gmail.com>
Date:   Thu, 27 Oct 2016 15:25:53 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Andy Lutomirski <luto@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH 2/2] x86/vdso: set vdso pointer only after success

On Thu, Oct 27, 2016 at 7:15 AM, Dmitry Safonov <dsafonov@...tuozzo.com> wrote:
> Those pointers were initialized before call to _install_special_mapping
> after the commit f7b6eb3fa072 ("x86: Set context.vdso before installing
> the mapping"). This is not required anymore as special mappings have
> their vma name and don't use arch_vma_name() after commit a62c34bd2a8a
> ("x86, mm: Improve _install_special_mapping and fix x86 vdso naming").
> So, this way to init looks less entangled.
> I even belive, we can remove null initializers:
> - on failure load_elf_binary() will not start a new thread;
> - arch_prctl will have the same pointers as before syscall.

Acked-by: Andy Lutomirski <luto@...nel.org>