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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | COLOPHON |
NEWGIDMAP(1) User Commands NEWGIDMAP(1)
newgidmap - set the gid mapping of a user namespace
newgidmap pid gid lowergid count [gid lowergid count [ ... ]]
The newgidmap sets /proc/[pid]/gid_map based on its command line
arguments and the gids allowed in /etc/subgid. Note that the root
user 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.
There currently are no options to the newgidmap command.
/etc/subgid
List of user's subordinate group IDs.
/proc/[pid]/gid_map
Mapping of gids from one between user namespaces.
login.defs(5), newusers(8), subgid(5), useradd(8), userdel(8),
usermod(8).
This page is part of the shadow-utils (utilities for managing
accounts and shadow password files) project. Information about the
project can be found at ⟨http://pkg-shadow.alioth.debian.org/⟩. If
you have a bug report for this manual page, see
⟨http://pkg-shadow.alioth.debian.org/getinvolved.php⟩. This page was
obtained from the project's upstream Git repository
⟨git://anonscm.debian.org/git/pkg-shadow/shadow.git⟩ on 2017-07-05.
If you discover any rendering problems in this HTML version of the
page, or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
shadow-utils 4.4 07/05/2017 NEWGIDMAP(1)
Pages that refer to this page: subgid(5), subuid(5), user_namespaces(7)