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1.170 ALMA-09-021800

Information

AlmaLinux OS 9 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time (JIT) compiler.

GROUP ID: V-269273
RULE ID: SV-269273r1050155

When hardened, the extended BPF JIT compiler will randomize any kernel addresses in the BPF programs and maps, and will not expose the JIT addresses in "/proc/kallsyms".

Solution

Configure AlmaLinux OS 9 to enable hardening for the BPF JIT compiler.

Create a numbered *.conf file in /etc/sysctl.d/ with the following content:

net.core.bpf_jit_harden = 2

The system configuration files must be reloaded for the changes to take effect. To reload the contents of the files, run the following command:

$ sysctl -system

See Also

https://workbench.cisecurity.org/benchmarks/27039

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-269273r1050155_rule, STIG-ID|ALMA-09-021800, Vuln-ID|V-269273

Plugin: Unix

Control ID: b053167826b1e6c5a4ca855d84ae75efd4482f31cbb91b311e74e1341a9a90c8