Mark Johnston
b7eae75807
Make sendfile(SF_SYNC)'s CV wait interruptible. ...
Otherwise, since the CV is not signalled until data is drained from the
socket, it is trivial to create an unkillable process using
sendfile(SF_SYNC) and a process-private PF_LOCAL socket pair. In
particular, the cv_wait() in sendfile() does not get interrupted until
data is drained from the receiving socket buffer.
Reported by: pho
Discussed with: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
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b7eae75807