{"description": "On x86 architecture supporting VT-d, the IOMMU manages the access control policy between the hardware devices and some\n    of the system critical units such as the memory.\nTo ensure that <tt>iommu=force</tt> is added as a kernel command line\nargument to newly installed kernels, add <tt>iommu=force</tt> to the\ndefault Grub2 command line for Linux operating systems. Modify the line within\n<tt>/etc/default/grub</tt> as shown below:\n<pre>GRUB_CMDLINE_LINUX=\"... iommu=force ...\"</pre>\nRun the following command to update command line for already installed kernels:<pre># update-grub</pre>", "rationale": "On x86 architectures, activating the I/OMMU prevents the system from arbitrary accesses potentially made by\n    hardware devices.", "severity": "unknown", "references": {"anssi": ["R7"]}, "control_references": {"anssi": ["R7"]}, "components": [], "identifiers": {}, "ocil_clause": "I/OMMU is not activated", "ocil": "Inspect the form of default GRUB 2 command line for the Linux operating system\nin <tt>/etc/default/grub</tt>. If it includes <tt>iommu=force</tt>,\nthen the parameter will be configured for newly installed kernels.\nFirst check if the GRUB recovery is enabled:\n<pre>$ sudo grep 'GRUB_DISABLE_RECOVERY' /etc/default/grub</pre>\nIf this option is set to true, then check that a line is output by the following command:\n<pre>$ sudo grep 'GRUB_CMDLINE_LINUX_DEFAULT.*iommu=force.*' /etc/default/grub</pre>\nIf the recovery is disabled, check the line with\n<pre>$ sudo grep 'GRUB_CMDLINE_LINUX.*iommu=force.*' /etc/default/grub</pre>.Moreover, current Grub config file <tt>grub.cfg</tt> must be checked. The file can be found\neither in <tt>/boot/grub</tt> in case of legacy BIOS systems, or in <tt>/boot/grub</tt> in case of UEFI systems.\nIf they include <tt>iommu=force</tt>, then the parameter\nis configured at boot time.\n<pre>$ sudo grep vmlinuz GRUB_CFG_FILE_PATH | grep -v 'iommu=force'</pre>\nFill in <tt>GRUB_CFG_FILE_PATH</tt> based on information above.\nThis command should not return any output.", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [{"functionality": "Depending on the hardware, devices and operating system used, enabling IOMMU can cause hardware instabilities. Proper function and stability should be assessed before applying remediation to production systems."}], "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": "IOMMU configuration directive", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/bootloader-grub2/grub2_enable_iommu_force/rule.yml", "template": {"name": "grub2_bootloader_argument", "vars": {"arg_name": "iommu", "arg_value": "force"}, "backends": {}}}