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Date: Mon, 21 Mar 2011 12:21:26 +0300
From: Vasiliy Kulikov <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE request: kernel: a collection of
 world-writable debugfs bugs

On Sun, Mar 20, 2011 at 15:45 -0400, Dan Rosenberg wrote:
> I don't mean to create unnecessary work, but have you actually
> confirmed that exposing each of these files as world-writable actually
> allows a user to cross privilege boundaries?

First 19 bugs allow anybody to interact with hardware on low level -
write to hw registers, load firmware, etc.

I'm not sure about ubifs debugfs files - they allow anybody to dump some
fs related information via printk(KERN_DEBUG, ...);  maybe it is just a
bit more precise statistics than statvfs(2) without any disclosure, but
I cannot understand it without understanding UBIFS internals.  Also this
may be not a bug in default distro setups as KERN_DEBUG messages are not
usually logged into world-readable log files.


Vasiliy Kulikov - bringing security into open computing environments

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