From ff12cde8be8eddaa4b97f2c2f1d2dae497382e59 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 19 Aug 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-08-19

---
 pc/devrtc.c    | 10 ++++++++++
 port/devarp.c  |  9 ++++-----
 port/net.c     | 52 +++++++++++++++++++++++++++++++-------------------
 power/dat.h    |  2 +-
 power/devrtc.c | 10 ++++++++++
 power/l.s      |  8 ++++----
 ss/devrtc.c    | 10 ++++++++++
 7 files changed, 71 insertions(+), 30 deletions(-)

diff --git a/pc/devrtc.c b/pc/devrtc.c
index 662205be233cad1d66bf5325168ebadb97677a39..4c7b6b3ad7c5517616192ef72042e104611673ae 100644
--- a/pc/devrtc.c
+++ b/pc/devrtc.c
@@ -84,6 +84,16 @@ rtcstat(Chan *c, char *dp)
 Chan*
 rtcopen(Chan *c, int omode)
 {
+	omode = openmode(omode);
+	switch(c->qid.path){
+	case Qrtc:
+		if(omode == OREAD)
+			break;
+		/* fall through */
+	case Qnvram:
+		if(strcmp(u->p->user, eve)!=0 || !cpuserver)
+			error(Eperm);
+	}
 	return devopen(c, omode, rtcdir, NRTC, devgen);
 }
 
diff --git a/port/devarp.c b/port/devarp.c
index d207dcd2cd1b8884ad7696995d2a68ef848965a9..fd9595c117b0b3a6bd90634373093fb5dc17f3e1 100644
--- a/port/devarp.c
+++ b/port/devarp.c
@@ -148,8 +148,7 @@ arpstat(Chan *c, char *db)
 Chan *
 arpopen(Chan *c, int omode)
 {
-
-	if(c->qid.path == CHDIR){
+	if(c->qid.path&CHDIR){
 		if(omode != OREAD)
 			error(Eperm);
 	}
@@ -165,7 +164,6 @@ arpopen(Chan *c, int omode)
 		break;
 	}
 
-
 	c->mode = openmode(omode);
 	c->flag |= COPEN;
 	c->offset = 0;
@@ -207,9 +205,10 @@ arpread(Chan *c, void *a, long n, ulong offset)
 	int	 part, bytes, size;
 	char	 *ststr;
 
+	if(c->qid.path&CHDIR)
+		return devdirread(c, a, n, arptab, Narptab, arpgen);
+
 	switch((int)(c->qid.path&~CHDIR)){
-	case arpdirqid:
-		return devdirread(c, a, n, 0, 0, arpgen);
 	case arpdataqid:
 		bytes = c->offset;
 		while(bytes < conf.arp*ARP_ENTRYLEN && n) {
diff --git a/port/net.c b/port/net.c
index 97ab15a87ca80d89ccdf3b431ae09c561a48441a..e5d28c42ec44067a9aa41c568e3983b43b4c3524 100644
--- a/port/net.c
+++ b/port/net.c
@@ -164,26 +164,6 @@ netstat(Chan *c, char *db, Network *np)
 		}
 }
 
-void
-netwstat(Chan *c, char *db, Network *np)
-{
-	Dir dir;
-	Netprot *p;
-
-	p = findprot(np, STREAMID(c->qid.path));
-	if(p == 0)
-		error(Enonexist);
-	lock(np);
-	if(strncmp(p->owner, u->p->user, NAMELEN)){
-		unlock(np);
-		error(Eperm);
-	}
-	convM2D(db, &dir);
-	strncpy(p->owner, dir.uid, NAMELEN);
-	p->mode = dir.mode;
-	unlock(np);
-}
-
 Chan *
 netopen(Chan *c, int omode, Network *np)
 {
@@ -306,3 +286,35 @@ netdisown(Netprot *p)
 {
 	p->owner[0] = 0;
 }
+
+#undef	CHDIR	/* BUG */
+#include "/sys/src/libc/9syscall/sys.h"
+
+void
+netwstat(Chan *c, char *db, Network *np)
+{
+	Dir dir;
+	Netprot *p;
+
+	p = findprot(np, STREAMID(c->qid.path));
+	if(p == 0)
+		error(Enonexist);
+	lock(np);
+
+	/*
+	 *  A network channel's ownership/permissions can be changed only if the
+	 *  wstat is by the owner or (HACK!) if it is performed using an fwstat.
+	 *  The latter allows processes started by a network listener to gain
+	 *  ownership of the connection.  The open file descriptor is used as
+	 *  a capability for the connection.
+	 */
+	if(strncmp(p->owner, u->p->user, NAMELEN) != 0 && u->scallnr != FWSTAT){
+		unlock(np);
+		error(Eperm);
+	}
+	convM2D(db, &dir);
+	strncpy(p->owner, dir.uid, NAMELEN);
+	p->mode = dir.mode;
+
+	unlock(np);
+}
diff --git a/power/dat.h b/power/dat.h
index 760e829c630105a4ba14c5e126fda424547f3d19..36eec58d9a7fec588ccb388cef63be0b2cbf9592 100644
--- a/power/dat.h
+++ b/power/dat.h
@@ -29,8 +29,8 @@ struct Lock
 
 struct Label
 {
-	ulong	pc;
 	ulong	sp;
+	ulong	pc;
 };
 
 struct Conf
diff --git a/power/devrtc.c b/power/devrtc.c
index 4a56273dc6a2b380b625dc7b3bb3098419dc89f2..66158fd0f29eccb0c0621e099e29a77468edd9e3 100644
--- a/power/devrtc.c
+++ b/power/devrtc.c
@@ -97,6 +97,16 @@ rtcstat(Chan *c, char *dp)
 Chan*
 rtcopen(Chan *c, int omode)
 {
+	omode = openmode(omode);
+	switch(c->qid.path){
+	case Qrtc:
+		if(omode == OREAD)
+			break;
+		/* fall through */
+	case Qnvram:
+		if(strcmp(u->p->user, eve)!=0 || !cpuserver)
+			error(Eperm);
+	}
 	return devopen(c, omode, rtcdir, NRTC, devgen);
 }
 
diff --git a/power/l.s b/power/l.s
index d4a74107f7c3b96129bdfef7dca9a3555277fac7..b4c07d873ffaa164f3682fbfdc80ea8371e4bda5 100644
--- a/power/l.s
+++ b/power/l.s
@@ -163,15 +163,15 @@ TEXT	wbflush(SB), $-4
 
 TEXT	setlabel(SB), $-4
 
-	MOVW	R31, 0(R1)
-	MOVW	R29, 4(R1)
+	MOVW	R29, 0(R1)
+	MOVW	R31, 4(R1)
 	MOVW	$0, R1
 	RET
 
 TEXT	gotolabel(SB), $-4
 
-	MOVW	0(R1), R31
-	MOVW	4(R1), R29
+	MOVW	0(R1), R29
+	MOVW	4(R1), R31
 	MOVW	$1, R1
 	RET
 
diff --git a/ss/devrtc.c b/ss/devrtc.c
index b0c144f39fe18b522b88985184f83fa36c8eff02..89bd7025d44855db7bde02d443e8861a5f48e290 100644
--- a/ss/devrtc.c
+++ b/ss/devrtc.c
@@ -89,6 +89,16 @@ rtcstat(Chan *c, char *dp)
 Chan*
 rtcopen(Chan *c, int omode)
 {
+	omode = openmode(omode);
+	switch(c->qid.path){
+	case Qrtc:
+		if(omode == OREAD)
+			break;
+		/* fall through */
+	case Qnvram:
+		if(strcmp(u->p->user, eve)!=0 || !cpuserver)
+			error(Eperm);
+	}
 	return devopen(c, omode, rtcdir, NRTC, devgen);
 }