New submission from Chris Siebenmann <c.pytho...@cs.toronto.edu>:
The easiest reproduction of this is:
import tarfile
tarfile.open("/dev/zero", "r:")
(If you use plain "r" you get a hang in attempted lzma decoding.)
I believe this is probably due to a missing 'elif self.offset == 0:' in the
'except EOFHeaderError' exception handling case that almost all of the other
exception handlers have.
This appears to be a very long standing issue based on the history of the code.
----------
components: Library (Lib)
messages: 339915
nosy: cks
priority: normal
severity: normal
status: open
title: tarfile module considers anything starting with 512 bytes of zero bytes
to be a valid tar file
versions: Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36596>
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