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 in /etc/subgid. Note that the root user
14       is not exempted from the requirement for a valid /etc/subgid entry.
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16       After the pid argument, newgidmap expects sets of 3 integers:
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18       gid
19           Beginning of the range of GIDs inside the user namespace.
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21       lowergid
22           Beginning of the range of GIDs outside the user namespace.
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24       count
25           Length of the ranges (both inside and outside the user namespace).
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27       newgidmap verifies that the caller is the owner of the process
28       indicated by pid and that for each of the above sets, each of the GIDs
29       in the range [lowergid, lowergid+count] is allowed to the caller
30       according to /etc/subgid before setting /proc/[pid]/gid_map.
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32       Note that newgidmap may be used only once for a given process.
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OPTIONS

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

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

45       login.defs(5), newusers(8), subgid(5), useradd(8), userdel(8),
46       usermod(8).
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50shadow-utils 4.6                  05/11/2019                      NEWGIDMAP(1)