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-rw-r--r--man7/namespaces.77
1 files changed, 7 insertions, 0 deletions
diff --git a/man7/namespaces.7 b/man7/namespaces.7
index e476950e71..6ca493c997 100644
--- a/man7/namespaces.7
+++ b/man7/namespaces.7
@@ -608,6 +608,13 @@ The process must have the
.BR CAP_SETUID
.RB ( CAP_SETGID )
capability in the parent user namespace.
+There is an exception to this requirement:
+a process writing to
+.I uid_map
+.RI ( gid_map )
+is allowed to map any single UID (GID) to the file system UID (GID) of the
+caller in the parent user namespace.
+
.IP *
The process must be in either the user namespace of the process
.I pid