linux-kernel - Re: [patch 0/8] unprivileged mount syscall

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Date:	Sat, 7 Apr 2007 01:55:44 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-fsdevel@...r.kernel.org, util-linux-ng@...r.kernel.org,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/8] unprivileged mount syscall


On Apr 6 2007 16:16, H. Peter Anvin wrote:
>> > 
>> > - users can use bind mounts without having to pre-configure them in
>> > /etc/fstab
>> > 
>
> This is by far the biggest concern I see.  I think the security implication of
> allowing anyone to do bind mounts are poorly understood.

$ whoami
miklos
$ mount --bind / ~/down_under

later that day:
# userdel -r miklos

So both the source (/) and target (~/down_under) directory must be owned 
by the user before --bind may succeed.

There may be other implications hpa might want to fill us in.

Regards,
Jan
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