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

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Date:	Thu, 20 Dec 2012 19:30:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [RFC] stack and heap are executable on x86_64

Wtf...

Kees Cook <keescook@...omium.org> wrote:

>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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