Now that file objects are subclassable, you can get at the file constructor
just by doing type(f) where f is any file object. This left a hole in
restricted execution mode that rexec.py can't plug by itself (although it
can plug part of it; the rest is plugged in fileobject.c now).
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 02ef0ef..f1af5b9 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1717,6 +1717,47 @@
raise TestFailed("expected TypeError from bogus keyword "
"argument to %r" % constructor)
+def restricted():
+ import rexec
+ if verbose:
+ print "Testing interaction with restricted execution ..."
+
+ sandbox = rexec.RExec()
+
+ code1 = """f = open(%r, 'w')""" % TESTFN
+ code2 = """f = file(%r, 'w')""" % TESTFN
+ code3 = """\
+f = open(%r)
+t = type(f) # a sneaky way to get the file() constructor
+f.close()
+f = t(%r, 'w') # rexec can't catch this by itself
+""" % (TESTFN, TESTFN)
+
+ f = open(TESTFN, 'w') # Create the file so code3 can find it.
+ f.close()
+
+ try:
+ for code in code1, code2, code3:
+ try:
+ sandbox.r_exec(code)
+ except IOError, msg:
+ if str(msg).find("restricted") >= 0:
+ outcome = "OK"
+ else:
+ outcome = "got an exception, but not an expected one"
+ else:
+ outcome = "expected a restricted-execution exception"
+
+ if outcome != "OK":
+ raise TestFailed("%s, in %r" % (outcome, code))
+
+ finally:
+ try:
+ import os
+ os.unlink(TESTFN)
+ except:
+ pass
+
def all():
lists()
dicts()
@@ -1752,6 +1793,7 @@
supers()
inherits()
keywords()
+ restricted()
all()