tree bf1bc8dfa507ca40970927efb2dd87b4f5bdd416
parent c61a2810a2161986353705b44d9503e6bb079f4f
author Eric W. Biederman <ebiederm@xmission.com> 1356676049 -0800
committer Eric W. Biederman <ebiederm@xmission.com> 1359267124 -0800

userns: Allow any uid or gid mappings that don't overlap.

When I initially wrote the code for /proc/<pid>/uid_map.  I was lazy
and avoided duplicate mappings by the simple expedient of ensuring the
first number in a new extent was greater than any number in the
previous extent.

Unfortunately that precludes a number of valid mappings, and someone
noticed and complained.  So use a simple check to ensure that ranges
in the mapping extents don't overlap.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>