udev_selinux(8) - Linux man page

Name

udev_selinux - Security Enhanced Linux Policy for the udev processes

Description

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

The udev processes execute with the udev_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 udev_t

Entrypoints

The udev_t SELinux type can be entered via the "mtrr_device_t,udev_helper_exec_t,unlabeled_t,proc_type,sysctl_type,filesystem_type,file_type,udev_exec_t" file types. The default entrypoint paths for the udev_t domain are the following:"

/dev/cpu/mtrr, /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*, all files on the system, /sbin/udev, /sbin/udevd, /sbin/udevadm, /sbin/udevsend, /sbin/udevstart, /sbin/start_udev, /usr/bin/udevinfo, /lib/udev/udev-acl, /sbin/wait_for_sysfs

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 udev policy is very flexible allowing users to setup their udev processes in as secure a method as possible.

The following process types are defined for udev:

udev_t

Note: semanage permissive -a udev_t

can be used to make the process type udev_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

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 udev policy is very flexible allowing users to setup their udev processes in as secure a method as possible.

The following file types are defined for udev:

udev_etc_t

- Set files with the udev_etc_t type, if you want to store udev files in the /etc directories.

udev_exec_t

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

udev_helper_exec_t

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

udev_tbl_t

- Set files with the udev_tbl_t type, if you want to treat the files as udev tbl data.

udev_var_run_t

- Set files with the udev_var_run_t type, if you want to store the udev files under the /run directory.

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 udev_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 policy modules.

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

Author

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