{"description": "To enable Kernel page-table isolation, add the argument <tt>pti=on</tt> to all\nBLS (Boot Loader Specification) entries ('options' line) for the Linux\noperating system in <tt>/boot/loader/entries/*.conf</tt>.", "rationale": "Kernel page-table isolation is a kernel feature that mitigates\nthe Meltdown security vulnerability and hardens the kernel\nagainst attempts to bypass kernel address space layout\nrandomization (KASLR).", "severity": "high", "references": {"nist": ["SI-16"], "srg": ["SRG-OS-000433-GPOS-00193"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "Kernel page-table isolation is not enabled", "ocil": "Inspect the form of all the BLS (Boot Loader Specification) entries\n('options' line) in <tt>/boot/loader/entries/*.conf</tt>. If they include\n<tt>pti=on</tt>, then Kernel page-table isolation is enabled at boot time.\n<br /><br />\nTo ensure <tt>pti=on</tt> is configured on the installed kernel, add\nthe kernel argument via a <pre>MachineConfig</pre> object to the appropriate\npools.", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["grub2 and system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["grub2_and_system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Enable Kernel Page-Table Isolation (KPTI)", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/bootloader-grub2/coreos_pti_kernel_argument/rule.yml", "template": {"name": "coreos_kernel_option", "vars": {"arg_name": "pti", "arg_value": "on"}, "backends": {}}}