Make maximum file size configurable.

Author: giomasce

cms/conf.py

@@ -68,6 +68,9 @@ def __init__(self):
         self.use_cgroups = True
         self.sandbox_implementation = 'isolate'
 
+        # Sandbox.
+        self.max_file_size = 1048576
+
         # WebServers.
         self.secret_key_default = "8e045a51e4b102ea803c06f92841a1fb"
         self.secret_key = self.secret_key_default

cms/grading/__init__.py

@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 # Contest Management System - http://cms-dev.github.io/
-# Copyright © 2010-2014 Giovanni Mascellani <mascellani@poisson.phc.unipi.it>
+# Copyright © 2010-2015 Giovanni Mascellani <mascellani@poisson.phc.unipi.it>
 # Copyright © 2010-2014 Stefano Maggiolo <s.maggiolo@gmail.com>
 # Copyright © 2010-2012 Matteo Boscariol <boscarim@hotmail.com>
 # Copyright © 2013 Bernard Blackham <bernard@largestprime.net>
@@ -36,7 +36,7 @@
 
 from sqlalchemy.orm import joinedload
 
-from cms import \
+from cms import config, \
     LANG_C, LANG_CPP, LANG_PASCAL, LANG_PYTHON, LANG_PHP, LANG_JAVA, \
     SCORE_MODE_MAX
 from cms.db import Submission
@@ -391,7 +391,7 @@ def evaluation_step_before_run(sandbox, command,
         sandbox.timeout = 0
         sandbox.wallclock_timeout = 0
     sandbox.address_space = memory_limit * 1024
-    sandbox.fsize = memory_limit * 1024
+    sandbox.fsize = config.max_file_size
 
     if stdin_redirect is not None:
         sandbox.stdin_file = stdin_redirect

config/cms.conf.sample

@@ -58,6 +58,14 @@
 
 
 
+    "_section": "Sandbox",
+
+    "_help": "Do not allow contestants' solutions to write files bigger",
+    "_help": "than this size (expressed in KB; defaults to 1 GB).",
+    "max_file_size": 1048576,
+
+
+
     "_section": "WebServers",
 
     "_help": "This key is used to encode information that can be seen",