From d565bf2f784ce1203e77306d05eade03933bc523 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Thu, 21 Nov 2013 16:50:49 +0100
Subject: ipc: add protected payload

Add a field ip_protected_payload and a flag ip_has_protected_payload
to struct ipc_port.

Clear the protected payload when a receive port is moved from one ipc
space to another.  This is done to retain the old behavior of
mach_msg, so that a port name is sent in the msgh_local_port field.
If the new owner of that receive right wishes to use the protected
payload mechanism, it has to be explicitly set again.

* ipc/ipc_port.h (struct ipc_port): Add field ip_protected_payload.
(ipc_port_set_protected_payload): Add function declaration.
(ipc_port_clear_protected_payload): Likewise.
(ipc_port_flag_protected_payload): Add accessor for the protected
payload flag.
(ipc_port_flag_protected_payload_set): Likewise.
(ipc_port_flag_protected_payload_clear): Likewise.
* ipc/ipc_port.c (ipc_port_init): Initialize protected payload.
(ipc_port_print): Print protected_payload.
(ipc_port_set_protected_payload): New function.
(ipc_port_clear_protected_payload): Likewise.
(ipc_port_destroy): Clear the payload when moving a receive port.
* ipc/ipc_right.c (ipc_right_copyin): Likewise.
(ipc_right_copyout): Likewise.
* ipc/ipc_object.c (ipc_object_copyin_from_kernel): Likewise.
* ipc/ipc_object.h (IO_BITS_PROTECTED_PAYLOAD): New bitmask.
(IO_BITS_OTYPE): Adjust accordingly.
---
 ipc/ipc_port.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'ipc/ipc_port.c')

diff --git a/ipc/ipc_port.c b/ipc/ipc_port.c
index 78211e64..89a5d673 100644
--- a/ipc/ipc_port.c
+++ b/ipc/ipc_port.c
@@ -422,6 +422,44 @@ ipc_port_set_seqno(
 	imq_unlock(mqueue);
 }
 
+/*
+ *	Routine:	ipc_port_set_protected_payload
+ *	Purpose:
+ *		Changes a port's protected payload.
+ *	Conditions:
+ *		The port is locked and active.
+ */
+
+void
+ipc_port_set_protected_payload(ipc_port_t port, unsigned long payload)
+{
+	ipc_mqueue_t mqueue;
+
+	mqueue = ipc_port_lock_mqueue(port);
+	port->ip_protected_payload = payload;
+	ipc_port_flag_protected_payload_set(port);
+	imq_unlock(mqueue);
+}
+
+/*
+ *	Routine:	ipc_port_clear_protected_payload
+ *	Purpose:
+ *		Clear a port's protected payload.
+ *	Conditions:
+ *		The port is locked and active.
+ */
+
+void
+ipc_port_clear_protected_payload(ipc_port_t port)
+{
+	ipc_mqueue_t mqueue;
+
+	mqueue = ipc_port_lock_mqueue(port);
+	ipc_port_flag_protected_payload_clear(port);
+	imq_unlock(mqueue);
+}
+
+
 /*
  *	Routine:	ipc_port_clear_receiver
  *	Purpose:
@@ -491,6 +529,8 @@ ipc_port_init(
 	port->ip_seqno = 0;
 	port->ip_msgcount = 0;
 	port->ip_qlimit = MACH_PORT_QLIMIT_DEFAULT;
+	ipc_port_flag_protected_payload_clear(port);
+	port->ip_protected_payload = 0;
 
 	ipc_mqueue_init(&port->ip_messages);
 	ipc_thread_queue_init(&port->ip_blocked);
@@ -613,6 +653,7 @@ ipc_port_destroy(
 		/* make port be in limbo */
 		port->ip_receiver_name = MACH_PORT_NULL;
 		port->ip_destination = IP_NULL;
+		ipc_port_flag_protected_payload_clear(port);
 		ip_unlock(port);
 
 		if (!ipc_port_check_circularity(port, pdrequest)) {
@@ -1215,6 +1256,11 @@ ipc_port_print(port)
 
 	indent += 2;
 
+	iprintf("flags ");
+	printf("has_protected_payload=%d",
+	       ipc_port_flag_protected_payload(port));
+	printf("\n");
+
 	ipc_object_print(&port->ip_object);
 	iprintf("receiver=0x%x", port->ip_receiver);
 	printf(", receiver_name=0x%x\n", port->ip_receiver_name);
@@ -1237,6 +1283,8 @@ ipc_port_print(port)
 	printf(", sndrs=0x%x", port->ip_blocked.ithq_base);
 	printf(", kobj=0x%x\n", port->ip_kobject);
 
+	iprintf("protected_payload=%p\n", (void *) port->ip_protected_payload);
+
 	indent -= 2;
 }
 
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