linux-kernel - RE: [PATCH] [SCSI] megaraid_sas: remove sysfs dbg

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Date:	Thu, 3 Dec 2009 08:01:16 -0700
From:	"Yang, Bo" <Bo.Yang@....com>
To:	Eugene Teo <eteo@...hat.com>, Casey Dahlin <cdahlin@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Bryn M. Reeves" <bmr@...hat.com>,
	DL-MegaRAID Linux <megaraidlinux@....com>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yang Hongyang <yanghy@...fujitsu.com>,
	Anand Gadiyar <gadiyar@...com>, Jiri Kosina <jkosina@...e.cz>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH] [SCSI] megaraid_sas: remove sysfs dbg_lvl world
 writeable permissions

How do you turn on poll_mode_io?

Thanks,

Bo Yang

________________________________________
From: Eugene Teo [eteo@...hat.com]
Sent: Wednesday, December 02, 2009 7:08 PM
To: Casey Dahlin
Cc: linux-kernel@...r.kernel.org; Bryn M. Reeves; DL-MegaRAID Linux; James E.J. Bottomley; Andrew Morton; Yang Hongyang; Anand Gadiyar; Jiri Kosina; linux-scsi@...r.kernel.org
Subject: Re: [PATCH] [SCSI] megaraid_sas: remove sysfs dbg_lvl world writeable permissions

On 12/02/2009 11:17 PM, Casey Dahlin wrote:
> From: Bryn M. Reeves<bmr@...hat.com>
>
> /sys/bus/pci/drivers/megaraid_sas/poll_mode_io defaults to being
> world-writable, which seems bad (letting any user affect kernel driver
> behavior).
>
> This turns off group and user write permissions, so that on typical
> production systems only root can write to it.
>
> Signed-off-by: Bryn M. Reeves<bmr@...hat.com>
> Signed-off-by: Casey Dahlin<cdahlin@...hat.com>

CC: Eugene Teo <eteo@...hat.com>

The subject should read: megaraid_sas: remove poll_mode_io world
writeable permissions instead, and this has been assigned with
CVE-2009-3939.

Thanks, Eugene
--
Eugene Teo / Red Hat Security Response Team--
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