gabriel diaz saw a cs crash in pool with a user mem overflow error.
take some speculative evasive action, since it's not reproducable, and
not easily debuggable in situ.

Reference: /n/atom/patch/applied2013/csstrdup
Date: Sun Oct 13 18:52:05 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/ndb/cs.c	Sun Oct 13 18:49:59 2013
+++ /sys/src/cmd/ndb/cs.c	Sun Oct 13 18:49:59 2013
@@ -1367,7 +1367,7 @@
 
 	/* '*' means any service */
 	if(strcmp(name, "*")==0){
-		strcpy(buf, name);
+		nstrcpy(buf, name, blen);
 		return buf;
 	}
 
@@ -1645,7 +1645,7 @@
 
 	/* '*' means any service */
 	if(strcmp(name, "*")==0){
-		strcpy(buf, name);
+		nstrcpy(buf, name, blen);
 		return buf;
 	}
 
@@ -2031,7 +2031,8 @@
 			ndbfree(nt);
 			continue;
 		}
-		strcpy(nt->attr, attr);
+		free(nt->attr);
+		attr = strdup(attr);
 		l = &nt->entry;
 	}
 	return t;