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

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Message-ID: <CAFLxGvzyhHC+QF-bFfp-yNBpCkS3JJ+RAr+5iCj0k_su9wJbGw@mail.gmail.com>
Date:	Wed, 26 Nov 2014 00:15:31 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Richard Weinberger <richard@....at>,
	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

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. :-(

-- 
Thanks,
//richard
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