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security: Use user_namespace::level to avoid redundant iterations in …
…cap_capable() When ns->level is not larger then cred->user_ns->level, then ns can't be cred->user_ns's descendant, and there is no a sense to search in parents. So, break the cycle earlier and skip needless iterations. v2: Change comment on suggested by Andy Lutomirski. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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