linux-kernel - Re: [PATCH] btrfs: should add a permission check for setfacl

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Message-ID: <20100520083340.GC11920@infradead.org>
Date:	Thu, 20 May 2010 04:33:40 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Shi Weihua <shiwh@...fujitsu.com>
Cc:	chris.mason@...cle.com, "Yan, Zheng" <zheng.yan@...cle.com>,
	linux-btrfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: should add a permission check for setfacl

On Tue, May 18, 2010 at 08:50:32AM +0800, Shi Weihua wrote:
> On btrfs, do the following
> ------------------
> # su user1
> # cd btrfs-part/
> # touch aaa
> # getfacl aaa
>   # file: aaa
>   # owner: user1
>   # group: user1
>   user::rw-
>   group::rw-
>   other::r--
> # su user2
> # cd btrfs-part/
> # setfacl -m u::rwx aaa
> # getfacl aaa
>   # file: aaa
>   # owner: user1
>   # group: user1
>   user::rwx           <- successed to setfacl
>   group::rw-
>   other::r--
> ------------------
> but we should prohibit it that user2 changing user1's acl.
> In fact, on ext3 and other fs, a message occurs:
>   setfacl: aaa: Operation not permitted

Can you add this as a new testcase to xfstests so that we can easiy
check for regressions and future filesystems implementing this
correctly?

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