linux-kernel - Re: [PATCH v3 5/7] x86, kaslr: Consolidate mem

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Message-ID: <CAGXu5jKbCE2r06iTH3P4HT_if_DPr_kPdz6_5C5Yr4-SEYbwSQ@mail.gmail.com>
Date:	Mon, 9 Mar 2015 18:26:10 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...e.de>, Baoquan He <bhe@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Kosina <jkosina@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] x86, kaslr: Consolidate mem_avoid array filling

On Mon, Mar 9, 2015 at 6:10 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Mon, Mar 9, 2015 at 6:00 PM, Kees Cook <keescook@...omium.org> wrote:
>> On Sat, Mar 7, 2015 at 2:07 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>
>> This may be a stupid question, but are boot_params being used outside
>> of the compressed loader? If so, it might make sense to split that
>> change into a separate patch to go to stable, if it's causing
>> problems. (And document what problem is getting solved.)
>
> boot_params will keep the same and until it is passed
> x86_64_start_kernel in vmlinux.
> and there it will be copied, same as cmdline.
>
> but current kaslr only support random the base high, and it does not
> support kexec
> and current boot loader (grub2) put it really low. (under 1M). the
> real real_mode. :).

Oh right! Of course, thanks for the details. Yes, it was implicitly
ignored before, but now it needs to be explicitly ignored. Great,
thanks!

-Kees

>
> Thanks
>
> Yinghai



-- 
Kees Cook
Chrome OS Security
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