bootloader_selinuxSELinux Policy documentation for bootlobootloader_selinux(8)

NAME bootloader_selinux - Security Enhanced Linux Policy for the bootloader processes

DESCRIPTION Security-Enhanced Linux secures the bootloader processes via flexible mandatory access control.

The bootloader processes execute with the bootloader_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

For example:

ps -eZ | grep bootloader_t

ENTRYPOINTS The bootloader_t SELinux type can be entered via the "mtrr_device_t,unlabeled_t,proc_type,sysctl_type,filesys- tem_type,file_type,bootloader_exec_t" file types. The default entry- point paths for the bootloader_t domain are the following:"

/dev/cpu/mtrr, all files on the system, /sbin/lilo.*, /sbin/ybin.*, /sbin/zipl, /sbin/grub, /usr/sbin/grub

PROCESS TYPES SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to ps

Policy governs the access confined processes have to files. SELinux bootloader policy is very flexible allowing users to setup their boot- loader processes in as secure a method as possible.

The following process types are defined for bootloader:

bootloader_t

Note: semanage permissive -a bootloader_t

can be used to make the process type bootloader_t permissive. Permis- sive process types are not denied access by SELinux. AVC messages will still be generated.

BOOLEANS SELinux policy is customizable based on least access required. boot- loader policy is extremely flexible and has several booleans that allow you to manipulate the policy and run bootloader with the tightest access possible.

If you want to allows xdm to execute bootloader, you must turn on the xdm_exec_bootloader boolean.

setsebool -P xdm_exec_bootloader 1

If you want to allows xdm to execute bootloader, you must turn on the xdm_exec_bootloader boolean.

setsebool -P xdm_exec_bootloader 1

FILE CONTEXTS SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls

Policy governs the access confined processes have to these files. SELinux bootloader policy is very flexible allowing users to setup their bootloader processes in as secure a method as possible.

The following file types are defined for bootloader:

bootloader_etc_t

- Set files with the bootloader_etc_t type, if you want to store boot- loader files in the /etc directories.

bootloader_exec_t

- Set files with the bootloader_exec_t type, if you want to transition an executable to the bootloader_t domain.

bootloader_tmp_t

- Set files with the bootloader_tmp_t type, if you want to store boot- loader temporary files in the /tmp directories.

Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.

MANAGED FILES The SELinux process type bootloader_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

file_type

all files on the system

COMMANDS semanage fcontext can also be used to manipulate default file context mappings.

semanage permissive can also be used to manipulate whether or not a process type is permissive.

semanage module can also be used to enable/disable/install/remove pol- icy modules.

semanage boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux pol- icy settings.

AUTHOR This manual page was auto-generated using sepolicy manpage by mgrepl.

SEE ALSO selinux(8), bootloader(8), semanage(8), restorecon(8), chcon(1), sepol- icy(8) , setsebool(8)

bootloader 13-01-04 bootloader_selinux(8)