[Python-Dev] Fuzzing bugs: most bugs are closed (original) (raw)

M.-A. Lemburg mal at egenix.com
Mon Jul 21 14:03:08 CEST 2008

On 2008-07-20 22:45, Victor Stinner wrote:

Le Saturday 19 July 2008 21:52:09 A.M. Kuchling, vous avez écrit :

Excellent work! Another fruitful area for fuzzing might be the miniature virtual machine used by the re module. It's possible to import sre and call the compile() function directly (see the end of Lib/srecompile.py for how it's invoked); I wonder how the regex VM copes with random strings of bytecode. Hum... how can I say it? It's trivial to crash sre :-) So I blacklisted sre.compile() in my fuzzer. For information, it's also very easy to crash CPython with fuzzed .pyc file. It's hard to check bytecode without execute it. It's maybe better to add checks directly in the VM.

I don't see that as a big problem: if you execute untrusted byte code, you are on your own anyway... whether that's byte code for the re engine or ceval.

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