linux-kernel - Re: [PATCH] restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid

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Message-ID: <20080102093719.4f9bc413@bree.surriel.com>
Date:	Wed, 2 Jan 2008 09:37:19 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] restrict reading from /proc/<pid>/maps to those who
 share ->mm or can ptrace pid

On Wed, 2 Jan 2008 14:09:57 +0000
Al Viro <viro@...IV.linux.org.uk> wrote:

> 	Contents of /proc/*/maps is sensitive and may become sensitive
> after open() (e.g. if target originally shares our ->mm and later
> does exec on suid-root binary).
> 	Check at read() (actually, ->start() of iterator) time that
> mm_struct we'd grabbed and locked is
> 	* still the ->mm of target
> 	* equal to reader's ->mm or the target is ptracable by reader.
> 
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Acked-by: Rik van Riel <riel@...hat.com>

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