From c3397574ffcc7c9411deeeb34d1bb1f407cd87c4 Mon Sep 17 00:00:00 2001
From: Olivier Dony <odo@openerp.com>
Date: Tue, 1 Jun 2010 10:28:29 +0200
Subject: [PATCH] [FIX] continuing implementation of safe_eval: fixed some
 evaluation contexts

bzr revid: odo@openerp.com-20100601082829-n6iqqm8f0wuscvtm
---
 bin/tools/convert.py   | 13 +++++++------
 bin/tools/safe_eval.py | 13 +++++++++++--
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/bin/tools/convert.py b/bin/tools/convert.py
index 5fb20530408..7f318b377f2 100644
--- a/bin/tools/convert.py
+++ b/bin/tools/convert.py
@@ -404,7 +404,8 @@ form: module.record_id""" % (xml_id,)
 
         def ref(str_id):
             return self.id_get(cr, None, str_id)
-        context = eval(context)
+
+        context=eval(context, locals_dict=locals())
 #        domain = eval(domain) # XXX need to test this line -> uid, active_id, active_ids, ...
 
         res = {
@@ -652,14 +653,14 @@ form: module.record_id""" % (xml_id,)
                     if key in brrec:
                         return brrec[key]
                     return dict.__getitem__(self2, key)
-            globals = d()
-            globals['floatEqual'] = self._assert_equals
-            globals['ref'] = ref
-            globals['_ref'] = ref
+            globals_dict = d()
+            globals_dict['floatEqual'] = self._assert_equals
+            globals_dict['ref'] = ref
+            globals_dict['_ref'] = ref
             for test in rec.findall('./test'):
                 f_expr = test.get("expr",'').encode('utf-8')
                 expected_value = _eval_xml(self, test, self.pool, cr, uid, self.idref, context=context) or True
-                expression_value = eval(f_expr, globals)
+                expression_value = eval(f_expr, globals_dict, nocopy=True)
                 if expression_value != expected_value: # assertion failed
                     self.assert_report.record_assertion(False, severity)
                     msg = 'assertion "%s" failed!\n'    \
diff --git a/bin/tools/safe_eval.py b/bin/tools/safe_eval.py
index f1a2ca1b5e7..0fcc7a20eb9 100644
--- a/bin/tools/safe_eval.py
+++ b/bin/tools/safe_eval.py
@@ -193,8 +193,8 @@ except ImportError:
 
 
 
-def safe_eval(expr, globals_dict=None, locals_dict=None, mode="eval"):
-    """safe_eval(expression[, globals[, locals[, mode]]]) -> value
+def safe_eval(expr, globals_dict=None, locals_dict=None, mode="eval", nocopy=False):
+    """safe_eval(expression[, globals[, locals[, mode[, nocopy]]]]) -> result
 
     System-restricted Python expression evaluation
 
@@ -216,6 +216,14 @@ def safe_eval(expr, globals_dict=None, locals_dict=None, mode="eval"):
 
     if globals_dict is None:
         globals_dict = {}
+
+    # prevent altering the globals/locals from within the sandbox
+    # by taking a copy.
+    if not nocopy:
+        globals_dict = dict(globals_dict)
+        if locals_dict is not None:
+            locals_dict = dict(locals_dict)
+
     globals_dict.update(
             __builtins__ = {
                 'True': True,
@@ -230,6 +238,7 @@ def safe_eval(expr, globals_dict=None, locals_dict=None, mode="eval"):
                 'tuple': tuple,
             }
     )
+
     return eval(test_expr(expr,_SAFE_OPCODES, mode=mode), globals_dict, locals_dict)