Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Fri, 13 Nov 2009 14:39:24 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: CVE request: kernel: bad permissions on megaraid_sas sysfs files

The megaraid_sas driver exposes a number of driver attributes in sysfs. 
Many of these are read-only, just export information from the driver and 
are world-readable.

A couple of attributes are writable and may be used to change the 
behaviour of the driver (e.g. setting debug logging levels, selecting 
poll vs. interrupt I/O mode etc).

Some of these writable attributes are mistakenly created with 
world-writable permissions, e.g. dbg_lvl and poll_mode_io.

This would allow an unprivileged user to affect kernel driver behaviour 
and logging level.

Upstream made the dbd_lvl permissions more restrictive:

The poll_mode_io pseudofile still has world-writable permissions 
upstream. I'm getting my colleague to submit a patch.

Thanks, Eugene

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.