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bpo-33720: Improve test for the stack overflow in marshal.loads(). #7336

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Merged
serhiy-storchaka merged 1 commit into from
Jul 5, 2018
Merged

bpo-33720: Improve test for the stack overflow in marshal.loads(). #7336

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bpo-33720: Improve test for the stack overflow in marshal.loads().
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@serhiy-storchaka
serhiy-storchaka committed Jun 2, 2018
commit 2a939bacd99658b396c55c2203c5e7004b7f4826
23 changes: 17 additions & 6 deletions Lib/test/test_marshal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -210,13 +210,24 @@ def test_fuzz(self):
except Exception:
pass

def test_loads_2x_code(self):
s = b'c' + (b'X' * 4*4) + b'{' * 2**20
self.assertRaises(ValueError, marshal.loads, s)

def test_loads_recursion(self):
s = b'c' + (b'X' * 4*5) + b'{' * 2**20
self.assertRaises(ValueError, marshal.loads, s)
def run_tests(N, check):
# (((...None...),),)
check(b')\x01' * N + b'N')
check(b'(\x01\x00\x00\x00' * N + b'N')
# [[[...None...]]]
check(b'[\x01\x00\x00\x00' * N + b'N')
# {None: {None: {None: ...None...}}}
check(b'{N' * N + b'N' + b'0' * N)
# frozenset([frozenset([frozenset([...None...])])])
check(b'>\x01\x00\x00\x00' * N + b'N')
# Check that the generated marshal data is valid and marshal.loads()
# works for moderately deep nesting
run_tests(100, marshal.loads)
# Very deeply nested structure shouldn't blow the stack
def check(s):
self.assertRaises(ValueError, marshal.loads, s)
run_tests(2**20, check)

def test_recursion_limit(self):
# Create a deeply nested structure.
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