Add pdrfork to OpenBSM

[asomers]

Summary

It's necessary for auditd to be able to log its events. Note that the
recently added pdwait() syscall is only auditable because an audit event
of that name was preemptively added back in 2012.

PR: 292739
MFC after: 1 week
Fixes: 5c2ee618d5e "sys: add pdrfork(2)"
Sponsored by: ConnectWise

[kib]

I think this is fine, and I have this change in some intermediate version of the patch.
But then I noted that e.g. inotify(2) is not there (unless I mistaken), so I decided that it is up to upstream to add missed syscalls, and then import a new version.
You might add inotify as well while there.

[asomers]

In D54897#1255061, @kib wrote:

I think this is fine, and I have this change in some intermediate version of the patch.
But then I noted that e.g. inotify(2) is not there (unless I mistaken), so I decided that it is up to upstream to add missed syscalls, and then import a new version.
You might add inotify as well while there.

Looking deeper, I've found dozens of syscalls that aren't in openbsm. membarrier, aio_writev, inotify_*, timerfd_*, and others. And there are also changes upstream that we've never merged. We have our work cut out for us ...