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newuidmap(1)

shadow-utils 4.8.1
03/24/2020

uidmap

programs to help use subuids

shadow-utils

Utilities for managing accounts and shadow password files

shadow

Password and account management tool suite with support for shadow files and PAM

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 users subordinate user IDs.
/proc/[pid]/uid_map
Mapping of uids from one between user namespaces.

REFERENCED BY

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