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Epsocket has incorrect recv(2) behavior after SHUT_RD.

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After shutdown(SHUT_RD) calls to recv /w MSG_DONTWAIT or with
O_NONBLOCK should result in a EAGAIN and not 0. Blocking sockets
should return 0 as they would have otherwise blocked indefinitely.

PiperOrigin-RevId: 201271123
Change-Id: If589b69c17fa5b9ff05bcf9e44024da9588c8876
This commit is contained in:
Brian Geffon
2018-06-19 17:29:11 -07:00
committed by Shentubot
parent 3ebd0e35f4
commit db66e383c3
1 changed files with 6 additions and 0 deletions
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pkg/sentry/socket/epsocket/epsocket.go
+6
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@@ -952,6 +952,12 @@ func (s *SocketOperations) RecvMsg(t *kernel.Task, dst usermem.IOSequence, flags
senderRequested = false
}
n, senderAddr, senderAddrLen, controlMessages, err = s.nonBlockingRead(t, dst, peek, trunc, senderRequested)
if err == syserr.ErrClosedForReceive && flags&linux.MSG_DONTWAIT != 0 {
// In this situation we should return EAGAIN.
return 0, nil, 0, socket.ControlMessages{}, syserr.ErrTryAgain
}
if err != syserr.ErrWouldBlock || flags&linux.MSG_DONTWAIT != 0 {
return
}