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Message-ID: <7ea32dbf-3f22-de92-8922-727d0512d090@prgmr.com>
Date: Thu, 8 Dec 2016 15:36:48 -0800
From: Sarah Newman <srn@...mr.com>
To: oss-security@...ts.openwall.com
Subject: Re: Opensource Python whitebox code analysis tool
recommendations
On 12/06/2016 09:02 AM, Fiedler Roman wrote:
> Hello list,
>
> I just stubled over effects of following programming error due to unwanted
> singleton in Python, bypassing intended process restrictions (allowed number
> of elements in my case) and of course data corruption:
>
> class A:
> def __init__(self, value=[]):
> self.value=value
> self.valueCloned=value[:]
> def show(self):
> print 'IDs value %x, cloned %x' % (id(self.value), id(self.valueCloned))
> def append(self, data):
> self.value.append(data)
>
> # Keep reference to avoid garbage collection interference.
> objFirst=A()
> objFirst.show()
> objNext=A()
> objNext.show()
> # Check references to prohibit optimization.
> if objFirst==objNext: raise Exception('Impossible')
>
>
>
> As this type of error seems to be more common in code, at least according to
> grep, are there tool recommendations to do automatic analysis of code?
>
It's not exactly the tool you're looking for, but pylint would have warned you:
W: 2, 2: Dangerous default value [] as argument (dangerous-default-value)
--Sarah
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