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Eric W. Biederman authored
The function send_signal was split from __send_signal so that it would be possible to bypass the namespace logic based upon current[1]. As it turns out the si_pid and the si_uid fixup are both inappropriate in the case of kill_pid_usb_asyncio so move that logic into send_signal. It is difficult to arrange but possible for a signal with an si_code of SI_TIMER or SI_SIGIO to be sent across namespace boundaries. In which case tests for when it is ok to change si_pid and si_uid based on SI_FROMUSER are incorrect. Replace the use of SI_FROMUSER with a new test has_si_pid_and_used based on siginfo_layout. Now that the uid fixup is no longer present after expanding SEND_SIG_NOINFO properly calculate the si_uid that the target task needs to read. [1] 7978b567 ("signals: add from_ancestor_ns parameter to send_signal()") Cc: stable@vger.kernel.org Fixes: 6588c1e3 ("signals: SI_USER: Masquerade si_pid when crossing pid ns boundary") Fixes: 6b550f94 ("user namespace: make signal.c respect user namespaces") Signed-off-by:
"Eric W. Biederman" <ebiederm@xmission.com>
7a0cf094