NEWUIDMAP(1) User Commands NEWUIDMAP(1)
NAME
newuidmap - set the uid mapping of a user namespace
SYNOPSIS
newuidmap pid uid loweruid count [uid loweruid count [ ... ]]
DESCRIPTION
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.
OPTIONS
There currently are no options to the newuidmap command.
FILES
/etc/subuid
List of user's subordinate user IDs.
/proc/[pid]/uid_map
Mapping of uids from one between user namespaces.
SEE ALSO
login.defs(5), newusers(8), subuid(5), useradd(8), usermod(8),
userdel(8).
shadow-utils 4.6 08/09/2019 NEWUIDMAP(1)