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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | COLOPHON |
NEWUIDMAP(1) User Commands NEWUIDMAP(1)
newuidmap - set the uid mapping of a user namespace
newuidmap pid uid loweruid count [uid loweruid count [ ... ]]
The newuidmap sets /proc/[pid]/uid_map based on its command line
arguments and the uids allowed in /etc/subuid. Note that the root
user is not exempted from the requirement for a valid /etc/subuid
entry.
After the pid argument, newuidmap expects sets of 3 integers:
uid
Beginning of the range of UIDs inside the user namespace.
loweruid
Beginning of the range of UIDs outside the user namespace.
count
Length of the ranges (both inside and outside the user
namespace).
newuidmap verifies that the caller is the owner of the process
indicated by pid and that for each of the above sets, each of the
UIDs in the range [loweruid, loweruid+count] is allowed to the caller
according to /etc/subuid before setting /proc/[pid]/uid_map.
Note that newuidmap may be used only once for a given process.
There currently are no options to the newuidmap command.
/etc/subuid
List of user's subordinate user IDs.
/proc/[pid]/uid_map
Mapping of uids from one between user namespaces.
login.defs(5), newusers(8), subuid(5), useradd(8), usermod(8),
userdel(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 NEWUIDMAP(1)
Pages that refer to this page: subgid(5), subuid(5), user_namespaces(7)