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libip: open temporary file-descriptors with OCEXEC flag

--- a/sys/src/libip/myetheraddr.c

+++ b/sys/src/libip/myetheraddr.c

@@ -13,7 +13,7 @@

 	else

 		snprint(buf, sizeof buf, "/net/%s/addr", dev);

-	fd = open(buf, OREAD);

+	fd = open(buf, OREAD|OCEXEC);

 	if(fd < 0)

 		return -1;

--- a/sys/src/libip/readipifc.c

+++ b/sys/src/libip/readipifc.c

@@ -63,7 +63,7 @@

 	Iplifc *lifc, **ll;

 	/* read the file */

-	fd = open(file, OREAD);

+	fd = open(file, OREAD|OCEXEC);

 	if(fd < 0)

 		return l;

 	n = 0;

@@ -177,7 +177,7 @@

 		snprint(buf, sizeof(buf), "%s/%d/status", directory, index);

 		_readipifc(buf, l, index);

 	} else {

-		fd = open(directory, OREAD);

+		fd = open(directory, OREAD|OCEXEC);

 		if(fd < 0)

 			return nil;

 		n = dirreadall(fd, &dir);