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GH-91079: Implement C stack limits using addresses, not counters. (GH-130007)

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* Implement C recursion protection with limit pointers

* Remove calls to PyOS_CheckStack

* Add stack protection to parser

* Make tests more robust to low stacks

* Improve error messages for stack overflow
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Mark Shannon 2025-02-19 11:44:57 +00:00 • committed by GitHub
parent c637bce20a
commit 2498c22fa0
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47 changed files with 1217 additions and 1463 deletions
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25
Lib/test/test_fstring.py
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@ -628,13 +628,23 @@ x = (
r"does not match opening parenthesis '\('",
["f'{a(4}'",
])
self.assertRaises(SyntaxError, eval, "f'{" + "("*500 + "}'")
self.assertRaises(SyntaxError, eval, "f'{" + "("*20 + "}'")
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
def test_fstring_nested_too_deeply(self):
self.assertAllRaise(SyntaxError,
"f-string: expressions nested too deeply",
['f"{1+2:{1+2:{1+1:{1}}}}"'])
def raises_syntax_or_memory_error(txt):
try:
eval(txt)
except SyntaxError:
pass
except MemoryError:
pass
except Exception as ex:
self.fail(f"Should raise SyntaxError or MemoryError, not {type(ex)}")
else:
self.fail("No exception raised")
raises_syntax_or_memory_error('f"{1+2:{1+2:{1+1:{1}}}}"')
def create_nested_fstring(n):
if n == 0:
@ -642,9 +652,10 @@ x = (
prev = create_nested_fstring(n-1)
return f'f"{{{prev}}}"'
self.assertAllRaise(SyntaxError,
"too many nested f-strings",
[create_nested_fstring(160)])
raises_syntax_or_memory_error(create_nested_fstring(160))
raises_syntax_or_memory_error("f'{" + "("*100 + "}'")
raises_syntax_or_memory_error("f'{" + "("*1000 + "}'")
raises_syntax_or_memory_error("f'{" + "("*10_000 + "}'")
def test_syntax_error_in_nested_fstring(self):
# See gh-104016 for more information on this crash