fapolicyd Blocks Trusted Custom Binary Execution

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Executable starts manually as root shell script wrapper but binary execution is denied.

Environment & Reproduction

fapolicyd trust database or policy rules do not permit the binary path/hash.

Root Cause Analysis

Run systemctl status fapolicyd and verify policy enforcement is active.

Quick Triage

Review journalctl -u fapolicyd -b and fapolicyd-cli outputs for denied file details.

Step-by-Step Diagnosis

Register file trust as required by policy and validate digest information.

Solution – Primary Fix

Update rules under /etc/fapolicyd and restart service safely.

Solution – Alternative Approaches

Confirm denials are not actually from SELinux AVC events.

Verification & Acceptance Criteria

Prefer RPM-packaged binaries so trust chain remains managed and auditable.

Rollback Plan

Allow only required execution contexts and avoid broad permissive rules.

Prevention & Hardening

Custom operational tooling can fail, interrupting maintenance and automation.

Related Errors & Cross-Refs

Document policy exceptions and approvals for executable allow-list changes.

Related tutorial: View the step-by-step tutorial for rhel-9.

View all rhel-9 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Integrate binary trust enrollment into deployment pipelines for RHEL 9 hosts.