keyctl_chown() changes the user and group ownership details of a key.
A setting of -1 on either uid or gid will cause that setting to be
A process that does not have the SysAdmin capability may not change a
key's UID or set the key's GID to a value that does not match the
process's GID or one of its group list.
The caller must have setattr permission on a key to be able change
ENOKEY The specified key does not exist.
The specified key has expired.
The specified key has been revoked.
EDQUOT Changing the UID to the one specified would run that UID out
EACCES The key exists, but does not grant setattr permission to the
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Linux 4 May 2006 KEYCTL_CHOWN(3)