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).