"Eric W. Biederman" [off-list ref] writes:
Limit per userns sysctls to only be opened for write by a holder
of CAP_SYS_RESOURCE.
Add all of the necessary boilerplate for having per user namespace
sysctls.
quoted hunk
@@ -141,6 +215,7 @@ void free_user_ns(struct user_namespace *ns)
do {
parent = ns->parent;
+ retire_userns_sysctls(ns);
^^^^^^^^^^ Unfortunately it is not safe to call a sleeping function here
so this part needs to be taken back to the drawing board.
Which means this change gets has to wait for next cycle. #ifdef CONFIG_PERSISTENT_KEYRINGS
key_put(ns->persistent_keyring_register);
#endif
Eric