New submission from Xinmeng Xia <[email protected]>:
Calling function ast.literal_eval() with large size can cause a segmentation
fault in Python 3.5 -3.10. Please check the following two examples. The example
1 works as expected, while the second one triggers segmentation fault on Python
3.5,3.6,3.7,3.8,3.9,3.10. The primary difference between these two examples lay
on the value of "n".
Example 1:
=========================================
import ast
mylist = []
n = 100000
print(ast.literal_eval("mylist"+"+mylist"*n))
==========================================
The actual output: value Error on Python 3.5,3.7,3.8,3.9,3.10, Recursive Error
on Python 3.6 (as expected)
Example 2:
===================================
import ast
mylist = []
n = 1000000
print(ast.literal_eval("mylist"+"+mylist"*n))
===================================
The actual output: segmentation fault on Python 3.5 - 3.10 (not as expected)
My system information:
>> python3.10 -V
Python 3.10.0a2
>> python3.9 -V
Python 3.9.0rc1
>> python3.8 -V
Python 3.8.0
>> python3.7 -V
Python 3.7.3
>> python3.6 -V
Python 3.6.12
>> uname -v
#73~16.04.1-Ubuntu
----------
components: Interpreter Core
messages: 383577
nosy: xxm
priority: normal
severity: normal
status: open
title: Segmentation fault in running ast.literal_eval() with large expression
size.
type: crash
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue42712>
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