linux-kernel - Re: [PATCH 6/6] x86: kaslr: relocate base offset at boot

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7f907e0b-c397-460f-a8ec-ce84b119ce84@email.android.com>
Date:	Mon, 15 Apr 2013 20:02:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Kees Cook <keescook@...omium.org>,
	Eric Northup <digitaleric@...gle.com>,
	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>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>
Subject: Re: [PATCH 6/6] x86: kaslr: relocate base offset at boot

No.  Fixing one bootloader is almost impossible.  Fixing them all is a Sisiphyean task.

Yinghai Lu <yinghai@...nel.org> wrote:

>On Mon, Apr 15, 2013 at 7:36 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 04/15/2013 03:00 PM, Yinghai Lu wrote:
>>>
>>> looks you are trying redo the work for bootloader to pick loaded
>phys addr.
>>>
>>
>> Well, that is exactly what they are doing.  On top of that they also
>> need to randomize the 64-bit virtual mapping.
>>
>> I wonder if we need a bootloader bit to inhibit kaslr in addition to
>the
>> command line...
>
>so let the bootloader to parse kaslr and pick ramdom address,
>and kernel arch/x86/boot/compressed/head_64.S to pick random virtual
>address?
>
>Yinghai

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/