OL 9 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-271768 | SRG-OS-000480-GPOS-00227 | OL09-00-002430 | SV-271768r1092016_rule | 2025-05-08 | 1 |
| 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". |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |