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

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Message-ID: <4616E459.1090409@zytor.com>
Date:	Fri, 06 Apr 2007 17:22:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
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

Jan Engelhardt wrote:
> 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.

Consider backups, for example.

	-hpa
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