linux-kernel - Re: [PATCH v6] RO/NX protection for loadable kernel modules

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Message-ID: <817ecb6f0909220849t2142f6bdhdeb0180dedc646d2@mail.gmail.com>
Date:	Tue, 22 Sep 2009 11:49:55 -0400
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	Dave Jones <davej@...hat.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-next@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@....de>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v6] RO/NX protection for loadable kernel modules

> Hi Siarhei,
>  I tried out this patch on 2.6.31, and got the following trace during bootup..
>
> ------------[ cut here ]------------
> WARNING: at kernel/trace/ftrace.c:1003 ftrace_bug+0x198/0x27e() (Not tainted)
> Hardware name: VGN-Z540N
...
> ---[ end trace 95b33ebf87286ae6 ]---
> ftrace faulted on writing [<ffffffffa0000193>] video_output_register+0x11/0x10a [output]
>
>
> I guess ftrace is trying to NOP out something in the modules which
> are marked read-only ?

Entirely possible. I will review ftrace and make sure the patch
accounts for this.

Thank you.
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