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The fix[1] for the following issue

   https://github.com/pyca/cryptography/issues/4833

was issued as part of this security advisory:

    https://access.redhat.com/errata/RHSA-2021:1608
    — RHSA-2021:1608 - Security Advisory

which is currently only available for RHEL 8.4 customers.

However, there are layered product (e.g. Red Hat OpenStack) customers
that are on RHEL 8.2, and cannot be forced to move to RHEL 8.4.  So we
need to provide the fix for RHEL 8.2.

(I say "the fix"; but the 8.4 advisory seem to have several bugs, 
including a rebase.  So I'll leave it to the RHEL maintainers to decide
what is appropriate to backport to RHEL 8.2.)

This bug is a tracker to backport this fix for RHEL 8.2.



[1] https://github.com/pyca/cryptography/commit/9a22851fab924fd58482fdad3f8dd23dc3987f91

Created attachment 1822807 [details]
Preliminary backport

Created attachment 1822844 [details]
Additional patch

This other patch gets us a bit closer, but not 100%:

>               raise AssertionError(out)
E               AssertionError: {'93824997185568': {'size': 32, 'path': 'crypto/stack/stack.c', 'line': 209}, '93824997185664': {'size': 40, 'path': 'crypto/asn1/tasn_new.c', 'line': 122}, '93824997185712': {'size': 40, 'path': 'crypto/asn1/tasn_new.c', 'line': 122}, '93824997320368': {'size': 3, 'path': 'crypto/asn1/asn1_lib.c', 'line': 284}, '93824997320912': {'size': 3, 'path': 'crypto/asn1/asn1_lib.c', 'line': 284}, '93824997423424': {'size': 32, 'path': 'crypto/stack/stack.c', 'line': 180}}
tests/hazmat/backends/test_openssl_memleak.py:114: AssertionError

NOTE: other tests fail as well due to missing dependencies and other bits. This is one, however, seems to show that we are still leaking a bit.

Your patch contains an additional test case that is neither in https://github.com/pyca/cryptography/pull/4836 nor in https://github.com/pyca/cryptography/pull/4889. I have created a personal branch with backports of the PRs, https://github.com/pyca/cryptography/compare/2.3...tiran:aiamemleak-2.3

RHEL 8.4.0 and RHEL 8.5.0 already have a newer version of python-cryptography that contains the fix for the memory leak.

*** This bug has been marked as a duplicate of bug 1873581 ***