linux-kernel - Re: [GIT PULL] namespace updates for v3.17-rc1

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Message-ID: <5479FB42.4080207@nod.at>
Date:	Sat, 29 Nov 2014 17:58:42 +0100
From:	Richard Weinberger <richard@....at>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"libvir-list@...hat.com" <libvir-list@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>
Subject: Re: [GIT PULL] namespace updates for v3.17-rc1

Am 26.11.2014 um 00:15 schrieb Richard Weinberger:
> Eric,
> 
> On Thu, Aug 21, 2014 at 4:09 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>> Richard Weinberger <richard@....at> writes:
>>
>>> Am 21.08.2014 15:12, schrieb Christoph Hellwig:
>>>> On Wed, Aug 20, 2014 at 09:53:49PM -0700, Eric W. Biederman wrote:
>>>>> Richard Weinberger <richard.weinberger@...il.com> writes:
>>>>>
>>>>>> On Wed, Aug 6, 2014 at 2:57 AM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>>>>>>
>>>>>> This commit breaks libvirt-lxc.
>>>>>> libvirt does in lxcContainerMountBasicFS():
>>>>>
>>>>> The bugs fixed are security issues, so if we have to break a small
>>>>> number of userspace applications we will.  Anything that we can
>>>>> reasonably do to avoid regressions will be done.
>>>>
>>>> Can you explain the security issues in detail?  Breaking common
>>>> userspace like libvirt-lxc with just a little bit of handwaiving is
>>>> entirely unacceptable.
>>>
>>> It looks like commit 87b47932f40a11280584bce260cbdb3b5f9e8b7d in
>>> git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git for-next
>>> unbreaks libvirt-lxc.
>>> I hope it hits Linus tree and -stable before the offending commit hits users.
>>
>> I plan to send the pull request to Linus as soon as I have caught my
>> breath (from all of the conferences this week) that I can be certain I
>> am thinking clearly and not rushing things.
> 
> Today I've upgraded my LXC testbed to the most recent kernel and found
> libvirt-lxc broken again (sic!).
> Remounting /proc/sys/ is failing.
> Investigating into the issue showed that commit "mnt: Implicitly add
> MNT_NODEV on remount as we do on mount"
> is not mainline.
> Why did you left out this patch? In my previous mails I explicitly
> stated that exactly this commit unbreaks libvirt-lxc.
> 
> Now the userspace breaking changes are mainline and hit users hard. :-(

*kind ping*
...to make sure that this issue doesn't get lost.

Thanks,
//richard
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