{"description": "This feature protects integrity of the allocator's metadata.\nThis configuration is available from kernel 4.14.\n\nThe configuration that was used to build kernel is available at <tt>/boot/config-*</tt>.\n    To check the configuration value for <tt>CONFIG_SLAB_FREELIST_HARDENED</tt>, run the following command:\n    <tt>grep CONFIG_SLAB_FREELIST_HARDENED /boot/config-*</tt>\n    \n    For each kernel installed, a line with value \"y\" should be returned.\n    ", "rationale": "Many kernel heap attacks try to target slab cache metadata and other infrastructure.\nThis options makes minor performance sacrifices to harden the kernel slab allocator against\ncommon freelist exploit methods.", "severity": "medium", "references": {"anssi": ["R17"]}, "control_references": {"anssi": ["R17"]}, "components": [], "identifiers": {}, "ocil_clause": "the kernel was not built with the required value", "ocil": "To determine the config value the kernel was built with, run the following command:\n    <pre>$ grep CONFIG_SLAB_FREELIST_HARDENED /boot/config.*</pre>\n    \n    For each kernel installed, a line with value \"y\" should be returned.\n    ", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [{"general": "There is no remediation for this besides re-compiling the kernel with the appropriate value for the config."}], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Harden slab freelist metadata", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/kernel_build_config/kernel_config_slab_freelist_hardened/rule.yml", "template": {"name": "kernel_build_config", "vars": {"config": "CONFIG_SLAB_FREELIST_HARDENED", "value": "y"}, "backends": {}}}