+++ This bug was initially created as a clone of Bug #2109485 +++

Description of problem:
Evaluating certain rules trigger an error message "Failed to check available memory" in OpenSCAP.

Version-Release number of selected component (if applicable):
openscap-1.3.6-3.el9.x86_64

How reproducible:
always

Steps to Reproduce:
1. Build RHEL9 content from upstream https://github.com/ComplianceAsCode/content/ as of HEAD 169b4e8cb5b331aef65375214de2920b3fde6619 (2022-07-21) or download the attachment of this BZ
2. Make sure there is enough word-writable files on your system, or create them artificially:
for x in $(seq 1000) ; do touch file$x; chmod o+w file$x ; done
3. Run scan
sudo oscap xccdf eval --profile 'stig' --rule xccdf_org.ssgproject.content_rule_accounts_user_dot_no_world_writable_programs --results-arf arf.xml ./ssg-rhel9-ds.xml

Actual results:
E: oscap:       Failed to check available memory

Expected results:
no error

Additional info:
- other rules can also trigger this error message, eg. accounts_user_dot_group_ownership, accounts_users_home_files_permissions
- the scanner doesn't crash, but validity of produced results is questionable
- also tracked in upstream in https://github.com/OpenSCAP/openscap/issues/1867

--- Additional comment from Jan Černý on 2022-07-21 11:34:26 UTC ---

Analysis:

--- Additional comment from Jan Černý on 2022-07-21 11:46:38 UTC ---

Analysis:
- The code that checks for available memory can return a negative value due to an incorrect handling of errno in read_common_sizet

--- Additional comment from Jan Černý on 2022-07-21 11:47:15 UTC ---

This has been fixed upstream in https://github.com/OpenSCAP/openscap/pull/1861

--- Additional comment from Jan Černý on 2022-07-22 15:04:45 UTC ---

We can use unit test proposed in https://github.com/OpenSCAP/openscap/pull/1874/ for testing.

--- Additional comment from Jan Černý on 2022-07-26 08:28:48 UTC ---

There are also additional occurrences of not resetting errno to 0 before strtol() in the OpenSCAP code base and we are going to fix these in https://github.com/OpenSCAP/openscap/pull/1875.