linux-kernel - Re: [PATCH 3.8 076/116] xfs: ioctl check for capabilities in the current user namespace

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Date:	Wed, 23 Jul 2014 18:51:23 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kamal Mostafa <kamal@...onical.com>
Cc:	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, kernel-team@...ts.ubuntu.com,
	Dwight Engen <dwight.engen@...cle.com>, Ben Myers <bpm@....com>
Subject: Re: [PATCH 3.8 076/116] xfs: ioctl check for capabilities in the current user namespace

Kamal Mostafa <kamal@...onical.com> writes:

> On Wed, 2014-07-23 at 09:12 +1000, Dave Chinner wrote:
>> On Tue, Jul 22, 2014 at 03:21:27PM -0700, Kamal Mostafa wrote:
>> > 3.8.13.27 -stable review patch.  If anyone has any objections, please let me know.
>> > 
>> > ------------------
>> > 
>> > From: Dwight Engen <dwight.engen@...cle.com>
>> > 
>> > commit fd5e2aa8653665ae1cc60f7aca1069abdbcad3f6 upstream.
>> > 
>> > Use inode_capable() to check if SUID|SGID bits should be cleared to match
>> > [...]
>> 
>> Why are you backporting this to 3.8? namespace support didn't come
>> along until much later, so grabbing one patch out of themiddle of a
>> patch series to allow userns support in XFS is likely to cause
>> problems because there's no supporting code in XFS it.
>> 
>> Please don't randomly cherry pick userns support patches that change
>> permission checks back into kernels that don't have userns support.
>
> Yup, that's why we ask for reviews all right!  I've dropped these from
> the 3.8-stable queue:
>
>     fs,userns: Change inode_capable to capable_wrt_inode_uidgid

The fs,userns: Chage inode_capable to capable_wrt_inode_uidgid is
appropriate for 3.8.  I think that one is applicable all of the way
back to 3.4

I don't know if xfs in 3.8 called inode_capable in xfs and if it didn't
you can remove that hunk.  To keep things very simple you could just
skip the rename of inode_capable to capable_wrt_uidgid and just
include the one line change to add kgid_has_mapping.

But that bug fix is very much applicable to older kernels.

Eric
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