linux-kernel - Re: [RFC] stack and heap are executable on x86

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Message-ID: <CAGXu5jJtoPdhZ_DGeaCT1AsUuLfS4LThaR0PkKbwmTG2rDPZKw@mail.gmail.com>
Date:	Thu, 20 Dec 2012 19:06:22 -0800
From:	Kees Cook <keescook@...omium.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Kees Cook <keescook@...omium.org>
Subject: Re: [RFC] stack and heap are executable on x86_64

On Thu, Dec 20, 2012 at 7:00 PM, Kees Cook <keescook@...omium.org> wrote:
> While trying to fix test_nx, I discovered that it looks like stack and
> heap are executable again (at least on x86_64). :( I tried to bisect

Btw, this ends up looking like this on v3.4:

[    2.486223] test_nx: Testing NX protection ...
[    2.487468] test_nx: calling ffff88001dd57e45 (0xC3)
[    2.488766] test_nx: stack is executable
[    2.489802] test_nx: calling ffff88001e2c7580 (0xC3)
[    2.491106] test_nx: heap is executable
[    2.492086] test_nx: calling ffffffff81803c80 (0xC3)
[    2.493201] test_nx: calling ffffffffa0002220 (0xC3)
[    2.493843] test_nx: calling ffffffffa0001224 (0xC3)
[    2.494549] test_nx: Done testing.

-Kees

--
Kees Cook
Chrome OS Security
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