linux-kernel - Re: [PATCH 2/2] dell-wmi: Process only one event on devices with interface version 0

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]

Date:	Mon, 28 Dec 2015 14:49:10 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Michał Kępień <kernel@...pniu.pl>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Darren Hart <dvhart@...radead.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dell-wmi: Process only one event on devices with interface version 0

On Monday 28 December 2015 14:40:56 Michał Kępień wrote:
> > BIOS/ACPI on devices with WMI interface version 0 does not clear
> > buffer before filling it. So next time when BIOS/ACPI send WMI
> > event which is smaller as previous then it contains garbage in
> > buffer from previous event.
> > 
> > BIOS/ACPI on devices with WMI interface version 1 clears buffer and
> > sometimes send more events in buffer at one call.
> 
> Are the explanations above based on your observations or perhaps some
> documentation?

Just observation from all DSDT files which I have seen.

-- 
Pali Rohár
pali.rohar@...il.com

Download attachment "signature.asc " of type "application/pgp-signature" (199 bytes)