[New-bugs-announce] [issue42713] Segmentation fault in running eval() with large expression size.

Xinmeng Xia report at bugs.python.org
Tue Dec 22 05:18:43 EST 2020


New submission from Xinmeng Xia <xiaxm at smail.nju.edu.cn>:

Calling function eval() with large size can cause a segmentation fault in Python 3.7 -3.10. Please check the following two examples. The example 1 works as expected, while the second one triggers segmentation fault on Python 3.7,3.8,3.9,3.10. The primary difference between these two examples lay on the value of "n".

Example 1:
=========================================
mylist = []
n = 100000
print(eval("mylist"+"+mylist"*n))
==========================================

The actual output: Recursion Error on Python 3.5-3.10 (as expected)




Example 2:
===================================
mylist = []
n = 1000000
print(eval("mylist"+"+mylist"*n))
===================================

The actual output: Recursive Error on Python 3.5, 3.6 (as expected),  segmentation fault on Python 3.7, 3.8, 3.9, 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: 383578
nosy: xxm
priority: normal
severity: normal
status: open
title: Segmentation fault in running eval() with large expression size.
type: crash
versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42713>
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