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1.168 RHEL-09-251045

Information

RHEL 9 must enable hardening for the Berkeley Packet Filter just-in-time compiler.

GROUP ID: V-257942
RULE ID: SV-257942r1044999

When hardened, the extended Berkeley Packet Filter (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".

Solution

Configure RHEL 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

See Also

https://workbench.cisecurity.org/benchmarks/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257942r1044999_rule, STIG-ID|RHEL-09-251045, Vuln-ID|V-257942

Plugin: Unix

Control ID: cedf288488fd06b067399b9ab31e8e550476ff33b1f614ea3909da7866169a07