{"description": "Instead of using the existing poison value, fill the pages with zeros. This makes it harder to\ndetect when errors are occurring due to sanitization but the zeroing at free means that it is\nno longer necessary to write zeros when GFP_ZERO is used on allocation.\nThis configuration is available from kernel 4.19.\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_PAGE_POISONING_ZERO</tt>, run the following command:\n    <tt>grep CONFIG_PAGE_POISONING_ZERO /boot/config-*</tt>\n    \n    For each kernel installed, a line with value \"y\" should be returned.\n    ", "rationale": "This configuration helps alleviates the performance impact of poisonining.", "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_PAGE_POISONING_ZERO /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": "Use zero for poisoning instead of debugging value", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/kernel_build_config/kernel_config_page_poisoning_zero/rule.yml", "template": {"name": "kernel_build_config", "vars": {"config": "CONFIG_PAGE_POISONING_ZERO", "value": "y"}, "backends": {}}}