linux-kernel - Re: [PATCH V3] VIA IRQ quirk behaviour change

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: <20060910213440.GA9412@srcf.ucam.org>
Date:	Sun, 10 Sep 2006 22:34:40 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Daniel Drake <dsd@...too.org>, akpm@...l.org,
	torvalds@...l.org, sergio@...giomb.no-ip.org, jeff@...zik.org,
	cw@...f.org, bjorn.helgaas@...com, linux-kernel@...r.kernel.org,
	harmon@....edu, len.brown@...el.com, vsu@...linux.ru,
	liste@...det.net
Subject: Re: [PATCH V3] VIA IRQ quirk behaviour change

On Sun, Sep 10, 2006 at 05:30:18PM -0400, Lee Revell wrote:

> Sorry, all I have is anecdotal evidence.  The scope of the problem isn't
> fully known.  Could be related to vendors implementing ACPI using SMM.
> Vendors are tight lipped about which hardware is affected because it
> understandably annoys users.

I don't know what you really mean by "implementing ACPI" here. Certain 
queries may generate SMM traps, but I haven't seen any event driven code 
paths that do[1]. If you're polling hardware you may generate some 
latency, but I don't think that's any great surprise.

It would be interesting to have a test case under Linux so we could 
attempt to figure out whether it's an actual problem, or just Windows 
doing awkward things.

[1] outside sort of obvious stuff like ripping out a hotswap bay and 
/potentially/ critical battery status to switch on a warning light, but 
if you hit those situations you're probably pretty much dead anyway

-- 
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/