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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright (c) 2013 Eric W. Biederman
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. The name of the copyright holders or contributors may not be used to
+ endorse or promote products derived from this software without
+ specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!-- SHADOW-CONFIG-HERE -->
+]>
+
+<refentry id='newgidmap.1'>
+ <refentryinfo>
+ <author>
+ <firstname>Eric</firstname>
+ <surname>Biederman</surname>
+ <contrib>Creation, 2013</contrib>
+ </author>
+ </refentryinfo>
+ <refmeta>
+ <refentrytitle>newgidmap</refentrytitle>
+ <manvolnum>1</manvolnum>
+ <refmiscinfo class="sectdesc">User Commands</refmiscinfo>
+ <refmiscinfo class="source">shadow-utils</refmiscinfo>
+ <refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
+ </refmeta>
+ <refnamediv id='name'>
+ <refname>newgidmap</refname>
+ <refpurpose>set the gid mapping of a user namespace</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv id='synopsis'>
+ <cmdsynopsis>
+ <command>newgidmap</command>
+ <arg choice='plain'>
+ <replaceable>pid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>gid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>lowergid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>count</replaceable>
+ </arg>
+ <arg choice='opt'>
+ <arg choice='plain'>
+ <replaceable>gid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>lowergid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>count</replaceable>
+ </arg>
+ <arg choice='opt'>
+ <replaceable>...</replaceable>
+ </arg>
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id='description'>
+ <title>DESCRIPTION</title>
+ <para>
+ The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename> based on its
+ command line arguments and the gids allowed in <filename>/etc/subgid</filename>.
+ Note that the root user is not exempted from the requirement for a valid
+ <filename>/etc/subgid</filename> entry.
+ </para>
+
+ <para>
+ After the pid argument, <command>newgidmap</command> expects sets of 3 integers:
+ <variablelist>
+ <varlistentry>
+ <term>gid</term>
+ <listitem>
+ <para>
+ Beginning of the range of GIDs inside the user namespace.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>lowergid</term>
+ <listitem>
+ <para>
+ Beginning of the range of GIDs outside the user namespace.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>count</term>
+ <listitem>
+ <para>
+ Length of the ranges (both inside and outside the user namespace).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+
+ <para>
+ <command>newgidmap</command> verifies that the caller is the owner
+ of the process indicated by <option>pid</option> and that for each
+ of the above sets, each of the GIDs in the range [lowergid,
+ lowergid+count] is allowed to the caller according to
+ <filename>/etc/subgid</filename> before setting
+ <filename>/proc/[pid]/gid_map</filename>.
+ </para>
+ <para>
+ Note that newgidmap may be used only once for a given process.
+ </para>
+
+ </refsect1>
+
+ <refsect1 id='options'>
+ <title>OPTIONS</title>
+ <para>
+ There currently are no options to the <command>newgidmap</command> command.
+ </para>
+ <variablelist remap='IP'>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='files'>
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/etc/subgid</filename></term>
+ <listitem>
+ <para>List of user's subordinate group IDs.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><filename>/proc/[pid]/gid_map</filename></term>
+ <listitem>
+ <para>Mapping of gids from one between user namespaces.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>subgid</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>.
+ </para>
+ </refsect1>
+</refentry>