Re: CVE request: pid namespace leak in kernel 3.0 and 3.1

[Eugene Teo <eugeneteo () kernel sg>]

On Fri, Apr 20, 2012 at 5:48 AM, Marcus Meissner <meissner () suse de> wrote:
> we had a user, Vadim Ponomarev (ccrssaa at karelia.ru),  report a pid
> namespace leak caused by vsftpd.
>
> https://bugzilla.novell.com/show_bug.cgi?id=757783
>
> He provided a simple reproducer:
[...]
> and checking "cat /proc/slabinfo|grep pid_namespace"
> gives 10000 more active slots after running it on 3.0.13 (+SUSE patches) and 3.1.10 (+SUSE patches).
>
> Running this on 3.2.0 (+SUSE Patches) did not result in more slots, so it was probably
> fixed between 3.1 and 3.2 (but someone else cross check perhaps).
>
> Any idea welcome on which patch fixed this, I tried 1b26c9b334044cff6d1d2698f2be41bc7d9a0864
> but it seems not helping.

I tested this with 3.0.25-rt44.57.el6rt.x86_64 yesterday, and I was
able to trigger the issue. The process needs to be privileged with
CAP_SYS_ADMIN.

Eric, besides struct pid_namespace, there is a corresponding struct pid_2 leak.

Thanks, Eugene