linux-kernel - Re: [RFT] x86 acpi: normalize segment descriptor register on resume

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: <20080714013125.GA3681@srcf.ucam.org>
Date:	Mon, 14 Jul 2008 02:31:25 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andy Lutomirski <luto@...ealbox.com>,
	Ingo Molnar <mingo@...e.hu>,
	public-kernel-testers-u79uwXL29TY76Z2rM5mHXA@...gmane.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

On Sun, Jul 13, 2008 at 01:38:27PM -0700, H. Peter Anvin wrote:

> The most likely explanation for this is that the VESA BIOS expects to be 
> entered in Big Real Mode (*.limit = 0xffffffff) instead of ordinary Real 
> Mode.  Here is a completely untested patch which changes the segment 
> descriptors to Big Real Mode instead.  It would be worth testing out.

Recent Lenovo BIOSes will read from somewhere just under the 4GB 
boundary if the video BIOS is called, so this sounds likely. 
Unfortunately my T61 is, uh, unhappy right now, so I can't test this.

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
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/