linux-kernel - Re: [PATCH 5/6] x86: kaslr: select memory region from e820 maps

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Message-ID: <517AF92F.3000403@zytor.com>
Date:	Fri, 26 Apr 2013 15:01:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>,
	Matthew Garrett <mjg@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Eric Northup <digitaleric@...gle.com>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>
Subject: Re: [PATCH 5/6] x86: kaslr: select memory region from e820 maps

On 04/26/2013 02:51 PM, Yinghai Lu wrote:
> On Fri, Apr 26, 2013 at 12:03 PM, Kees Cook <keescook@...omium.org> wrote:
>> This chooses the largest contiguous RAM region for the KASLR offset
>> to live in.
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>> v2:
>>  - make sure to exclude e820 regions outside the 32-bit memory range.
> 
> Do you need to execlude range that is used for initrd and possible
> command_line and boot_param ?
> 

Yes, those would have to be excluded.  For correctness the mem= and
memmap= options should also be taken into account.

	-hpa


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