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

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Message-ID: <CAE9FiQX2Ee0gWhtDrQxi=NfwC3Vu9ZS_YLPC9qvR92htZfBcJg@mail.gmail.com>
Date:	Mon, 9 Mar 2015 18:10:15 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kees Cook <keescook@...omium.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 6:00 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. :).

Thanks

Yinghai
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