linux-kernel - Re: 2.6.18 - check for chroot, broken root and cwd values in procfs

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Message-ID: <20061013230617.GA15489@wavehammer.waldi.eu.org>
Date:	Sat, 14 Oct 2006 01:06:17 +0200
From:	Bastian Blank <bastian@...di.eu.org>
To:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: 2.6.18 - check for chroot, broken root and cwd values in procfs

On Thu, Oct 12, 2006 at 04:02:24PM +0200, Bastian Blank wrote:
> The commit 778c1144771f0064b6f51bee865cceb0d996f2f9 replaced the old
> root-based security checks in procfs with processed based ones.

The new behaviour even allows a user to escape from the chroot by using
chdir to /proc/$pid/cwd or /proc/$pid/root of a process he owns and
lives outside of the chroot.

Bastian

-- 
Punishment becomes ineffective after a certain point.  Men become insensitive.
		-- Eneg, "Patterns of Force", stardate 2534.7

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