Fix buffer overflow in syren utility

Patch for https://code.google.com/p/android/issues/detail?id=68268

A length check for the argv[2] was added in order to prevent buffer
overflow.  Also replace strcpy with strlcpy.

Signed-off-by: nks <nks@sixserv.org>
Change-Id: If65b83e9b658315c672e684f64e3ae00e69fac31

toolbox/syren.c

@@ -123,15 +123,19 @@ syren_main(int argc, char **argv)
 
 	r = find_reg(argv[2]);
 	if (r == NULL) {
-		strcpy(name, argv[2]);
+		if(strlen(argv[2]) >= sizeof(name)){
+			fprintf(stderr, "REGNAME too long\n");
+			return 0;
+		}
+		strlcpy(name, argv[2], sizeof(name));
 		char *addr_str = strchr(argv[2], ':');
 		if (addr_str == NULL)
 			return usage();
 		*addr_str++ = 0;
 		sio.page = strtoul(argv[2], 0, 0);
 		sio.addr = strtoul(addr_str, 0, 0);
 	} else {
-		strcpy(name, r->name);
+		strlcpy(name, r->name, sizeof(name));
 		sio.page = r->page;
 		sio.addr = r->addr;
 	}