linux-kernel - Re: [PATCH v5] RO/NX protection for loadable kernel modules

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Message-ID: <20090711084958.69ff9196@infradead.org>
Date:	Sat, 11 Jul 2009 08:49:58 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ingo Molnar <mingo@...e.hu>, Siarhei Liakh <sliakh.lkml@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.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>
Subject: Re: [PATCH v5] RO/NX protection for loadable kernel modules

On Sat, 11 Jul 2009 18:21:46 +0930
Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Sat, 11 Jul 2009 03:37:01 pm Rusty Russell wrote:
> > On Fri, 10 Jul 2009 08:54:03 pm Ingo Molnar wrote:
> > > please use the customary comment style:
> >
> > Please don't.  There's one spot in that file which does it, and
> > frankly it's a distracting waste of space.
> 
> Sorry, Ingo there's more than one.  I don't bother fixing up others'
> comments in patches, so the file is now a bit mixed.  It'd be better
> to make it uniform, in which case I'd change it to kernel-style.
> 
> I have a question about this patch though: I think it's unsafe in
> general to mark the last partial page as NX (we asked for executable
> pages, this could remove executable from some unrelated allocation).
> 

we vmalloc / g_f_p modules right? so we don't share the last page.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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