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

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Date:	Fri, 21 Feb 2014 13:27:08 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kees Cook <keescook@...omium.org>,
	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 Fri, 21 Feb 2014 13:18:26 -0800 "H. Peter Anvin" <hpa@...or.com> wrote:

> 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.

We do?  What's that Kconfig variable called?

We have a few (inconsistently named) things like

CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK=y
CONFIG_BOOTPARAM_HOTPLUG_CPU0=y
CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y
CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE=1
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC=y
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=1
CONFIG_BOOTPARAM_HUNG_TASK_PANIC=y
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=1
CONFIG_DEBUG_BOOT_PARAMS=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=1
CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE=1

which presumably become obsolete with a general
feed-this-string-to-the-kernel feature?

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