linux-kernel - Re: [PATCH] x86, kaslr: randomize module base load address

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Message-ID: <5307C2A2.5010006@zytor.com>
Date:	Fri, 21 Feb 2014 13:18:26 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Jianguo Wu <wujianguo@...wei.com>,
	Andy Honig <ahonig@...gle.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] x86, kaslr: randomize module base load address

On 02/21/2014 01:15 PM, Andrew Morton wrote:
>>
>> I've been slapped down for adding more config options in the past, and
>> I think it's unlikely that people using CONFIG_RANDOMIZE_BASE won't
>> want the modules base randomized too. I think this is a safe default,
>> but if you see it as a requirement, I can change it.
> 
> I think there were issues with some embedded systems where it's
> hard/impossible to provide/alter boot parameters.
> 

We now allow kernel parameters to be compiled into the kernel image for
that reason.

> 
> btw, would it be better to make each module have its own offset rather
> than using the same offset for all of them?  That could cause problems
> with vmap space fragmentation I guess.
> 

... but it would improve the amount of entropy.

	-hpa

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