{"description": "To disable use of virtual syscalls, add the argument <tt>vsyscall=none</tt> to all\nBLS (Boot Loader Specification) entries ('options' line) for the Linux\noperating system in <tt>/boot/loader/entries/*.conf</tt>.", "rationale": "Virtual Syscalls provide an opportunity of attack for a user who has control\nof the return instruction pointer.", "severity": "medium", "references": {"nist": ["CM-7(a)"], "srg": ["SRG-OS-000480-GPOS-00227", "SRG-APP-000243-CTR-000600"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "vsyscalls are 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>vsyscall=none</tt>, then virtual syscalls are not enabled at boot time.\n<br /><br />\nTo ensure <tt>vsyscall=none</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": "Disable vsyscalls", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/bootloader-grub2/coreos_vsyscall_kernel_argument/rule.yml", "template": {"name": "coreos_kernel_option", "vars": {"arg_name": "vsyscall", "arg_value": "none"}, "backends": {}}}