linux-kernel - Re: [PATCH 0/3] ABI CHANGE!!! Remove questionable remote SP reads

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Message-ID: <CALCETrULWhzph=kpbQUQSEkmsm6ZaRtp_bV9j5LFaFjLkawwMw@mail.gmail.com>
Date:   Mon, 3 Oct 2016 16:08:24 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Borislav Petkov <bp@...en8.de>, Jann Horn <jann@...jh.net>,
        Linux API <linux-api@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Tycho Andersen <tycho.andersen@...onical.com>
Subject: Re: [PATCH 0/3] ABI CHANGE!!! Remove questionable remote SP reads

On Fri, Sep 30, 2016 at 10:58 AM, Andy Lutomirski <luto@...nel.org> wrote:
> Jann Horn noticed that KSTK_ESP + eager task stack freeing was a bad
> combination and could crash.  I could very easily fix it to not
> crash, but I think that using KSTK_ESP on a remote task is
> questionable in general.  Therefore, I propose to get rid of the
> major users for 4.9.

Ping!

We need to decide fairly soon whether to apply these (or perhaps just
patch 1 or just patches 2 and 3) for 4.9.  For any parts that aren't
applied, I'll send quick fixups to pin the stack in the offending
code.

--Andy