linux-kernel - Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86, core)

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Message-ID: <CALCETrVPhm37JJh+0qGjUBhxyDAF6R4ZpCX22UQvBzgYz6zzpw@mail.gmail.com>
Date:   Tue, 6 Sep 2016 09:40:08 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Jann Horn <jann@...jh.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Brian Gerst <brgerst@...il.com>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86, core)

On Tue, Sep 6, 2016 at 9:19 AM, Jann Horn <jann@...jh.net> wrote:
> On Thu, Jun 23, 2016 at 09:41:11AM -0700, Andy Lutomirski wrote:
>> 3. Free stacks immediately and cache them (really easy).
>
> Random note: task_current_syscall() (via /proc/$pid/syscall) will probably need additional
> locking when the stack is freed before the task.

Thanks.  I'm testing a patch now.

-- 
Andy Lutomirski
AMA Capital Management, LLC