SV-281337r1167161: RHEL 10 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.

Description

Discussion Text

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".

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-002824

References

DPMS Target Red Hat Enterprise Linux 10 DISA DPMS Target Red Hat Enterprise Linux 10 5733

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.rhel10os:def:281337
# RHEL 10 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# net.core.bpf_jit_harden is set to 2
# sysctl_object (sysctl_test)
test_1() {
  [ "$(cat /proc/sys/net/core/bpf_jit_harden)" -eq 2 ]
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.stig.rhel10os:def:281337

if [ ! -f "/etc/sysctl.d/99-net_core-bpf_jit_harden.conf" ]; then
    echo "PASS"
    exit 0
fi

if grep -q "^net.core.bpf_jit_harden = 2$" /etc/sysctl.d/99-net_core-bpf_jit_harden.conf; then
    echo "PASS"
    exit 0
fi

echo "FAIL"
exit 1

Remediation

Configure RHEL 10 to enable hardening for the BPF JIT compiler.

Create the drop-in file if it does not already exist:

$ sudo vi /etc/sysctl.d/99-net_core-bpf_jit_harden.conf

Add the following line to the file:

net.core.bpf_jit_harden = 2

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system