linux-kernel - Re: VFS, NFS security bug? Should CAP_MKNOD and CAP_LINUX_IMMUTABLE be added to CAP_FS

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Message-ID: <517f3f820903121321sf6d2014q8165b925d5d44db7@mail.gmail.com>
Date:	Fri, 13 Mar 2009 09:21:23 +1300
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Igor Zhbanov <izh1979@...il.com>, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, neilb@...e.de, Trond.Myklebust@...app.com,
	David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: VFS, NFS security bug? Should CAP_MKNOD and CAP_LINUX_IMMUTABLE 
	be added to CAP_FS_MASK?

On Fri, Mar 13, 2009 at 5:10 AM, Serge E. Hallyn <serue@...ibm.com> wrote:
> Quoting J. Bruce Fields (bfields@...ldses.org):
>> On Wed, Mar 11, 2009 at 03:53:34PM +0300, Igor Zhbanov wrote:
>> > Hello!
>> >
>> > It seems that CAP_MKNOD and CAP_LINUX_IMMUTABLE were forgotten to be
>> > added to CAP_FS_MASK_B0 in linux-2.6.x and to CAP_FS_MASK in
>> > linux-2.4.x. Both capabilities affects file system and can be
>> > considered file system capabilities.
>>
>> Sounds right to me--I'd expect rootsquash to guarantee that new device
>> nodes can't be created from the network.  Cc'ing random people from the
>> git log for include/linux/capability.h in hopes they can help.
>
> Yeah it seems reasonable.  If it is, then does that mean that we
> also need CAP_SYS_ADMIN (to write selinux labels) and CAP_SETFCAP
> (to set file capabilities) as well?

If a change is made to CAP_FS_MASK, please do remember to CC
mtk.manpages@...il.com, and linux-api@.

Cheers,

Michael


-- 
Michael Kerrisk Linux man-pages maintainer;
http://www.kernel.org/doc/man-pages/ Found a documentation bug?
http://www.kernel.org/doc/man-pages/reporting_bugs.html
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