From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: mathias.schnarrenberger@gmx.de,
Olaf van der Spek <olafvdspek@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: security: delete BIOS password in keyboard buffer during kernel bootup
Date: Tue, 11 Nov 2008 17:18:09 +0100 [thread overview]
Message-ID: <20081111161808.GA4473@ucw.cz> (raw)
In-Reply-To: <20081109110814.13a4c099@lxorguk.ukuu.org.uk>
On Sun 2008-11-09 11:08:14, Alan Cox wrote:
> On Sun, 9 Nov 2008 09:41:20 +0100
> Mathias Schnarrenberger <mathias.schnarrenberger@gmx.de> wrote:
>
> > > What if my BIOS stores some critical info at that memory address?
> > > I don't think the kernel is the right place to work around this issue.
> >
> > AFAIK every IBM PC compatible BIOS stores the keyboard buffer in this area.
>
> Not every system we boot the x86 kernel on is a PC compatible.
OTOH we don't call BIOS from linux, so we assume that low 64K is
usable memory (unless marked otherwise in memmap, I guess).
Anyway, proper place to do clearing is bootloader; it interacts with
bios already, anyway...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2008-11-11 16:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-08 10:00 Mathias Schnarrenberger
2008-11-08 14:27 ` Alan Cox
2008-11-08 14:36 ` Mathias Schnarrenberger
2008-11-08 16:39 ` Olaf van der Spek
2008-11-09 8:41 ` Mathias Schnarrenberger
2008-11-09 11:08 ` Alan Cox
2008-11-11 16:18 ` Pavel Machek [this message]
2008-11-11 16:54 ` Alan Cox
2008-11-12 8:51 ` Gerhard Mack
2008-11-09 15:36 ` Arjan van de Ven
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