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