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

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Message-Id: <E1HfAlG-0002MD-00@dorka.pomaz.szeredi.hu>
Date:	Sat, 21 Apr 2007 10:16:02 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	serue@...ibm.com, viro@....linux.org.uk, linuxram@...ibm.com,
	ebiederm@...ssion.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org
Subject: Re: [patch 8/8] allow unprivileged fuse mounts

> > Use FS_SAFE for "fuse" fs type, but not for "fuseblk".
> > 
> > FUSE was designed from the beginning to be safe for unprivileged
> > users.  This has also been verified in practice over many years.
> 
> How does FUSE do this?
> 
> There are obvious cases like crafting a filesystem which has setuid executables
> or world-writeable device nodes or whatever.  I'm sure there are lots of other
> cases.
> 
> Where is FUSE's implementation of all this protection described?

Most of it is in Documentation/filesystems/fuse.txt, some of it is
code comments.

Miklos
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