linux-kernel - Re: [patch 7/8] allow unprivileged mounts

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Message-ID: <Pine.LNX.4.61.0704211743100.9989@yvahk01.tjqt.qr>
Date:	Sat, 21 Apr 2007 17:43:28 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>, serue@...ibm.com,
	viro@....linux.org.uk, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org
Subject: Re: [patch 7/8] allow unprivileged mounts


On Apr 21 2007 08:10, Eric W. Biederman wrote:
>>
>>> Define a new fs flag FS_SAFE, which denotes, that unprivileged
>>> mounting of this filesystem may not constitute a security problem.
>>> 
>>> Since most filesystems haven't been designed with unprivileged
>>> mounting in mind, a thorough audit is needed before setting this flag.
>>
>> Practically speaking, is there any realistic likelihood that any filesystem
>> apart from FUSE will ever use this?
>
>Also potentially some of the kernel virtual filesystems.  /proc should
>be safe already.  If you don't have any kind of backing store this problem
>gets easier.

tmpfs!


Jan
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