linux-kernel - Re: [kernel-hardening] Re: [PATCH] fork: make whole stack

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Message-ID: <877f8orz0d.fsf@mid.deneb.enyo.de>
Date:   Mon, 31 Oct 2016 22:26:26 +0100
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Jann Horn <jann@...jh.net>
Cc:     Daniel Micay <danielmicay@...il.com>,
        Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random

* Jann Horn:

> Until recently: Zero, no guard pages below stacks, stack overflow
> goes straight into some other allocation.
> Now: One guard page, thanks to a lot of work by Andy Lutomirski.
> (I think that change is in the current 4.9-rc3 kernel, but not in
> any stable kernel yet.)

Sorry, I meant for the stack allocation in user space.

(I'm very much a user space person only.)