NEWGIDMAP(1)

NAME
newgidmap - set the gid mapping of a user namespace

SYNOPSIS

newgidmap pid gid lowergid count [pid gid lowergid count [ ... ]]

DESCRIPTION

The newgidmap sets /proc/[pid]/gid_map based on it's command line arguments and the gids allowed in /etc/subgid.

After the pid argument, newgidmap expects sets of 3 integers:

gid
    Begining of the range of GIDs inside the user namespace.

lowergid
    Begining 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 users 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).