linux-kernel - Re: [PATCH 1/4] mce: Slim up struct mce

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: <20120305091701.GB1070@aftab>
Date:	Mon, 5 Mar 2012 10:17:01 +0100
From:	Borislav Petkov <bp@...64.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Luck, Tony" <tony.luck@...el.com>, Borislav Petkov <bp@...64.org>,
	EDAC devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] mce: Slim up struct mce

On Sat, Mar 03, 2012 at 08:37:26AM +0100, Ingo Molnar wrote:
> 
> * Luck, Tony <tony.luck@...el.com> wrote:
> 
> > > Drop unused ->apicid, make ->socketid __u16 since it is 
> > > copied from struct cpuinfo_86.phys_proc_id, reorder members 
> > > and adjust padding so that it remains packed and on a 
> > > 64-byte boundary.
> > 
> > This structure is user visible via /dev/mcelog.  The mcelog(8) 
> > daemon has been coded to cope with extra fields being added to 
> > the end of the structure (an old daemon that doesn't know what 
> > they are will just skip over them). But things will break if 
> > you change the offsets of any fields that it does know about.
> 
> Please separate out a 'struct mce_legacy' data type that 
> contains the /dev/mcelog format, and use it in the place that 
> outputs to /dev/mcelog (and convert from 'struct mce' to 'struct 
> mce_legacy' and back when interacting with /dev/mcelog).

Either that or I'll save my patch for when we remove /dev/mcelog
altogether.

> This keeps 'struct mce' kernel internal and flexible. A pure 
> kernel internal structure should never have been exported like 
> this to begin with, doing that results in problems like this.

Ho-hum.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
--
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/