{"description": "Fill the pages with poison patterns after free_pages() and verify the patterns before\nalloc_pages. This does have a potential performance impact if enabled with the \"page_poison=1\"\nkernel boot option.\nThis configuration is available from kernel 4.6.\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</tt>, run the following command:\n    <tt>grep CONFIG_PAGE_POISONING /boot/config-*</tt>\n    \n    For each kernel installed, a line with value \"y\" should be returned.\n    ", "rationale": "The filling of the memory helps reduce the risk of information leaks from freed data.", "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 /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": "Enable poison of pages after freeing", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/kernel_build_config/kernel_config_page_poisoning/rule.yml", "template": {"name": "kernel_build_config", "vars": {"config": "CONFIG_PAGE_POISONING", "value": "y"}, "backends": {}}}