[Bug 1509752] [NEW] Bug in ensure_not_symlink() from 0003-CVE-2015-1335.patch

[Steve]

Public bug reported:

This bug/limitation is present in lxc from 1.0.7-0ubuntu0.5 through
1.0.7-0ubuntu0.9 (or anything that incorporates
0003-CVE-2015-1335.patch).  Basically, the limitation is obvious when
using recursive bind mounts because ensure_not_symlink() only checks the
last line of /proc/self/mountinfo which will be a submount so will
always fail the test and trigger:

ensure_not_symlink: 1413 Mount onto /usr/lib/x86_64-linux-
gnu/lxc/storage resulted in /usr/lib/x86_64-linux-
gnu/lxc/storage/submount, not /usr/lib/x86_64-linux-gnu/lxc/storage

Sorry if this is a duplicate, I did spend quite some time trying to find
a similar report.

Thanks!

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Bug in ensure_not_symlink() from 0003-CVE-2015-1335.patch

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