linux-kernel - Re: [PATCH v8] RO/NX protection for loadable kernel modules

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Date:	Mon, 1 Feb 2010 11:22:45 -0500
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	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>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH v8] RO/NX protection for loadable kernel modules

> Needs more brackets around arguments, otherwise someone calling it with
> a complex expression will get very upset.
[...]

Done.

> The core_text_size test should be enough here.

Done.

>> +                     begin_pfn = PFN_DOWN((unsigned long)mod->module_core);
>> +                     end_pfn = PFN_DOWN((unsigned long)mod->module_core +
>> +                                             mod->core_text_size);
>> +                     if (end_pfn > begin_pfn)
>> +                             set_memory_rw(begin_pfn << PAGE_SHIFT,
>> +                                                     end_pfn - begin_pfn);
>
> Much of this code might be neater if you created a helper:

Done.

> But these are minor: patch looks good!

Thanks for your feedback!
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