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From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Arjan van de Ven <arjan@infradead.org>
Subject: Re: [PATCH] x86 Fix test_poke for vmalloced pages
Date: Tue, 11 Mar 2008 05:25:24 -0400	[thread overview]
Message-ID: <20080311092524.GA30220@Krystal> (raw)
In-Reply-To: <20080311090947.GG25110@elte.hu>

* Ingo Molnar (mingo@elte.hu) wrote:
> 
> * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:
> 
> > The shadow vmap for DEBUG_RODATA kernel text modification uses 
> > virt_to_page to get the pages from the pointer address.
> > 
> > However, I think vmalloc_to_page would be required in case the page is 
> > used for modules.
> > 
> > Since only the core kernel text is marked read-only, use 
> > kernel_text_address() to make sure we only shadow map the core kernel 
> > text, not modules.
> 
> actually, i think we should mark module text readonly too.
> 

I agree, then we would have to use vmalloc_to_page. I guess it has not
been done before because there wasn't any mechanism such as text_poke
available.

Mathieu

> 	Ingo

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

  reply	other threads:[~2008-03-11  9:25 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-10 18:36 Mathieu Desnoyers
2008-03-11  9:09 ` Ingo Molnar
2008-03-11  9:25   ` Mathieu Desnoyers [this message]
2008-03-12 15:54   ` Mathieu Desnoyers

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