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OL09-00-002430 - OL 9 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.
Information
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".Solution
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
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_9_V1R6_STIG.zip
Item Details
Audit Name: DISA Oracle Linux 9 STIG v1r6
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-271768r1092016_rule, STIG-ID|OL09-00-002430, Vuln-ID|V-271768
Plugin: Unix
Control ID: 8ca6982444d3c551f0f3ca705fda02e0b044e7ba4e91a50a770ac610b1c4466e