Balint Reczey
101 lines
2.8 KiB
Groff
101 lines
2.8 KiB
Groff
'\" t
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.\" Title: newgidmap
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.\" Author: Eric Biederman
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.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
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.\" Date: 11/08/2022
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.\" Manual: User Commands
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.\" Source: shadow-utils 4.13
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.\" Language: English
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.\"
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.TH "NEWGIDMAP" "1" "11/08/2022" "shadow\-utils 4\&.13" "User Commands"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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newgidmap \- set the gid mapping of a user namespace
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.SH "SYNOPSIS"
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.HP \w'\fBnewgidmap\fR\ 'u
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\fBnewgidmap\fR \fIpid\fR \fIgid\fR \fIlowergid\fR \fIcount\fR [\fIgid\fR\ \fIlowergid\fR\ \fIcount\fR\ [\ \fI\&.\&.\&.\fR\ ]]
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.SH "DESCRIPTION"
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.PP
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The
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\fBnewgidmap\fR
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sets
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/proc/[pid]/gid_map
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based on its command line arguments and the gids allowed\&. Subgid delegation can either be managed via
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/etc/subgid
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or through the configured NSS subid module\&. These options are mutually exclusive\&.
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.PP
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Note that the root group is not exempted from the requirement for a valid
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/etc/subgid
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entry\&.
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.PP
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After the pid argument,
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\fBnewgidmap\fR
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expects sets of 3 integers:
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.PP
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gid
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.RS 4
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Beginning of the range of GIDs inside the user namespace\&.
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.RE
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.PP
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lowergid
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.RS 4
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Beginning of the range of GIDs outside the user namespace\&.
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.RE
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.PP
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count
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.RS 4
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Length of the ranges (both inside and outside the user namespace)\&.
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.RE
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.PP
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\fBnewgidmap\fR
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verifies that the caller is the owner of the process indicated by
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\fBpid\fR
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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
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/etc/subgid
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before setting
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/proc/[pid]/gid_map\&.
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.PP
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Note that newgidmap may be used only once for a given process\&.
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.SH "OPTIONS"
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.PP
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There currently are no options to the
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\fBnewgidmap\fR
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command\&.
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.SH "FILES"
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.PP
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/etc/subgid
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.RS 4
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List of user\*(Aqs subordinate group IDs\&.
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.RE
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.PP
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/proc/[pid]/gid_map
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.RS 4
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Mapping of gids from one between user namespaces\&.
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.RE
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.SH "SEE ALSO"
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.PP
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\fBlogin.defs\fR(5),
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\fBnewusers\fR(8),
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\fBsubgid\fR(5),
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\fBuseradd\fR(8),
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\fBuserdel\fR(8),
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\fBusermod\fR(8)\&.
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