OL 9 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271768 | OL09-00-002430 | SV-271768r1092016_rule | CCI-000366 | medium |
| Description | ||||
| When hardened, the extended BPF just-in-time (JIT) compiler will randomize any kernel addresses in the BPF programs and maps and will not expose the JIT addresses in "/proc/kallsyms". | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271768r1092016_chk)
Verify that OL 9 enables hardening for the BPF JIT with the following commands:
$ sudo sysctl net.core.bpf_jit_harden
net.core.bpf_jit_harden = 2
If the returned line does not have a value of "2", or a line is not returned, this is a finding.
Fix Text (F-75725r1092015_fix)
Configure OL 9 to enable hardening for the BPF JIT compiler by adding the following line to a file, in the "/etc/sysctl.d" directory:
net.core.bpf_jit_harden = 2
The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:
$ sudo sysctl --system