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DescriptionChristian Heimes
2023-02-22 10:45:13 UTC
Description of problem:
cffi 1.12 added a new keyword argument "require_writable=True" to its from_buffer() API. The feature is required to fix python-cryptography CVE-2023-23931.
Version-Release number of selected component (if applicable):
python3-cffi-1.11.5-5.el8
How reproducible:
always
Steps to Reproduce:
$ python3
>>> from cryptography.hazmat.backends.openssl import backend
>>> b = b'bytes'
>>> buf = backend._ffi.from_buffer(b)
>>> buf[0] = b'a'
>>> b
b'aytes'
>>> buf = backend._ffi.from_buffer(b, require_writable=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: from_buffer() takes no keyword arguments
Actual results:
TypeError: from_buffer() takes no keyword arguments
Expected results:
from_buffer(b, require_writable=True) is supported
Additional info:
changelog: https://cffi.readthedocs.io/en/latest/whatsnew.html?highlight=require_writable#v1-12
upstream issue: https://foss.heptapod.net/pypy/cffi/-/issues/394
upstream commit: https://foss.heptapod.net/pypy/cffi/-/commit/c5c4d32c3e3ec0fbaabc4b9890fd17c9c58407d2
Preverified using test compose http://artifacts.osci.redhat.com/comp/rhel-8.9.0/52100464-4011-python-cryptography/ with python3-cryptography-3.2.1-6.el8.x86_64 and python3-cffi-1.11.5-6.el8.x86_64
Python 3.6.8 (default, Jan 23 2023, 22:31:05)
[GCC 8.5.0 20210514 (Red Hat 8.5.0-18)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from cryptography.hazmat.backends.openssl import backend
>>> b = b'bytes'
>>> buf = backend._ffi.from_buffer(b)
>>> buf[0] = b'a'
>>> b
b'aytes'
>>> buf = backend._ffi.from_buffer(b, require_writable=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
BufferError: Object is not writable.
>>>
parameter require_writable supported, marking as tested.
Verified manually using nightly RHEL8.9 machine with python3-cffi-1.11.5-6.el8.x86_64 and python3-cryptography-3.2.1-6.el8.x86_64.
# python3
Python 3.6.8 (default, Jan 23 2023, 22:31:05)
[GCC 8.5.0 20210514 (Red Hat 8.5.0-18)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from cryptography.hazmat.backends.openssl import backend
>>> b = b'bytes'
>>> buf = backend._ffi.from_buffer(b)
>>> buf[0] = b'a'
>>> b
b'aytes'
>>> buf = backend._ffi.from_buffer(b, require_writable=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
BufferError: Object is not writable.
Marking as verified.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (python-cffi bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2023:7095