1NEWGIDMAP(1)                     User Commands                    NEWGIDMAP(1)
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NAME

6       newgidmap - set the gid mapping of a user namespace
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SYNOPSIS

9       newgidmap pid gid lowergid count [gid lowergid count [ ... ]]
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DESCRIPTION

12       The newgidmap sets /proc/[pid]/gid_map based on its command line
13       arguments and the gids allowed. Subgid delegation can either be managed
14       via /etc/subgid or through the configured NSS subid module. These
15       options are mutually exclusive.
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17       Note that the root group is not exempted from the requirement for a
18       valid /etc/subgid entry.
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20       After the pid argument, newgidmap expects sets of 3 integers:
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22       gid
23           Beginning of the range of GIDs inside the user namespace.
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25       lowergid
26           Beginning of the range of GIDs outside the user namespace.
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28       count
29           Length of the ranges (both inside and outside the user namespace).
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31       newgidmap verifies that the caller is the owner of the process
32       indicated by pid and that for each of the above sets, each of the GIDs
33       in the range [lowergid, lowergid+count) is allowed to the caller
34       according to /etc/subgid before setting /proc/[pid]/gid_map.
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36       Note that newgidmap may be used only once for a given process.
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OPTIONS

39       There currently are no options to the newgidmap command.
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FILES

42       /etc/subgid
43           List of user's subordinate group IDs.
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45       /proc/[pid]/gid_map
46           Mapping of gids from one between user namespaces.
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SEE ALSO

49       login.defs(5), newusers(8), subgid(5), useradd(8), userdel(8),
50       usermod(8).
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54shadow-utils 4.11.1               02/10/2022                      NEWGIDMAP(1)
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