From: Eric W. Biederman <ebiederm@xmission.com>
Date: Fri, 28 Dec 2012 06:27:29 +0000 (-0800)
Subject: userns: Allow any uid or gid mappings that don't overlap.
X-Git-Tag: v3.9-rc1~85^2~90
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bd14b4fd72afd5df41e9fd59f356740f22fceba;p=pandora-kernel.git

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>
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