linux-kernel - Re: [PATCHv2 7/7] cgroup: mount cgroupns-root when inside non-init cgroupns

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Date:	Fri, 31 Oct 2014 19:59:45 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Aditya Kali <adityakali@...gle.com>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	cgroups@...r.kernel.org,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Rohit Jnagal <jnagal@...gle.com>
Subject: Re: [PATCHv2 7/7] cgroup: mount cgroupns-root when inside non-init cgroupns

Andy Lutomirski <luto@...capital.net> writes:
>> @@ -1862,6 +1904,7 @@ static struct file_system_type cgroup_fs_type = {
>>         .name = "cgroup",
>>         .mount = cgroup_mount,
>>         .kill_sb = cgroup_kill_sb,
>> +       .fs_flags = FS_USERNS_MOUNT,
>
> Aargh, another one!  Eric, can you either ack or nack my patch?
> Because if my patch goes in, then this line may need to change.  Or
> not, but if a stable release with cgroupfs and without my patch
> happens, then we'll have an ABI break.

cgroupfs has no device nodes.  So as long as we are consistent in any
given release what happens here is orthogonal.

I don't remember if we have managed to get the original problem fixed
with the trivial backportable solution.  I think so.

My apologies for not getting to that I haven't even had time to shepherd
through the regression associated regression fix.  I probably just lock
track of them but I haven't found the Tested-By's for it yet.

Nor have I had time to dig through and figure out how to safely deal
with umount -l aka MOUNT_DETACH.

Along with the question about what to do with nodev, there is also
your patch about nosuid.

Starting in about 5 minutes I am going to be mostly offline until
sometime in the 3rd week in November as I haul all of my stuff accross
the country to someplace that actually has winter and my allergies don't
kill me.

I am going to have to review and merge a lot of code as soon as I am
back to being a programmer full time again.  There is a lot of
interesting stuff coming in right now.

Eric
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