linux-kernel - Re: [PATCH RFC] x86: check for and defend against BIOS memory corruption

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Message-ID: <b170af450808291039u7d036313x49acdaec079e6213@mail.gmail.com>
Date:	Fri, 29 Aug 2008 19:39:57 +0200
From:	"Rafał Miłecki" <zajec5@...il.com>
To:	"Hugh Dickins" <hugh@...itas.com>
Cc:	"Alan Jenkins" <alan-jenkins@...fmail.co.uk>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Yinghai Lu" <yhlu.kernel@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] x86: check for and defend against BIOS memory corruption

2008/8/29 Hugh Dickins <hugh@...itas.com>:
> Here's my version of Jeremy's patch, that I've now tested on my machines,
> as x86_32 and as x86_64.  It addresses none of the points Alan Cox made,
> and it stays silent for me, even after suspend+resume, unless I actually
> introduce corruption myself.  Omits Jeremy's check in fault.c, but does
> a check every minute, so should soon detect Rafał's HDMI corruption
> without any need to suspend+resume.

Your periodic test works fine:

Corrupted low memory at ffff88000000be9c (be9c phys) = b02a0004
 <IRQ>  [<ffffffff8020fc9b>] check_for_bios_corruption+0x93/0x9f
 [<ffffffff8020fca7>] ? periodic_check_for_corruption+0x0/0x25
 [<ffffffff8020fcb0>] periodic_check_for_corruption+0x9/0x25

By the way I confirmed this bug on Sony Vaio FW11M (my one is FW11S).
Probably more machines from FW11* are affected.

-- 
Rafał Miłecki