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).

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