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NEWGIDMAP(1)                     User Commands                    NEWGIDMAP(1)
NAME
       newgidmap - set the gid mapping of a user namespace
SYNOPSIS
       newgidmap pid gid lowergid count [gid lowergid count [ ... ]]
DESCRIPTION
       The newgidmap sets /proc/[pid]/gid_map based on its command line
       arguments and the gids allowed. Subgid delegation can either be managed
       via /etc/subgid or through the configured NSS subid module. These
       options are mutually exclusive.
       Note that the root group is not exempted from the requirement for a
       valid /etc/subgid entry.
       After the pid argument, newgidmap expects sets of 3 integers:
       gid
           Beginning of the range of GIDs inside the user namespace.
       lowergid
           Beginning of the range of GIDs outside the user namespace.
       count
           Length of the ranges (both inside and outside the user namespace).
       newgidmap verifies that the caller is the owner of the process
       indicated by pid 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 /etc/subgid before setting /proc/[pid]/gid_map.
       Note that newgidmap may be used only once for a given process.
OPTIONS
       There currently are no options to the newgidmap command.
FILES
       /etc/subgid
           List of user's subordinate group IDs.
       /proc/[pid]/gid_map
           Mapping of gids from one between user namespaces.
SEE ALSO
       login.defs(5), newusers(8), subgid(5), useradd(8), userdel(8),
       usermod(8).
shadow-utils 4.6                  04/06/2024                      NEWGIDMAP(1)