scm: Require CAP_SYS_ADMIN over the current pidns to spoof pids.
Don't allow spoofing pids over unix domain sockets in the corner cases where a user has created a user namespace but has not yet created a pid namespace. Cc: stable@vger.kernel.org Reported-by: NAndy Lutomirski <luto@amacapital.net> Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>
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