Security-Enhanced Linux secures the svirt_tcg processes via flexible mandatory access control.
The svirt_tcg processes execute with the svirt_tcg_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
ps -eZ | grep svirt_tcg_t
The svirt_tcg_t SELinux type can be entered via the qemu_exec_t file type.
The default entrypoint paths for the svirt_tcg_t domain are the following:
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux svirt_tcg policy is very flexible allowing users to setup their svirt_tcg processes in as secure a method as possible.
The following process types are defined for svirt_tcg:
Note: semanage permissive -a svirt_tcg_t can be used to make the process type svirt_tcg_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
For example one process might be launched with svirt_tcg_t:s0:c1,c2, and another process launched with svirt_tcg_t:s0:c3,c4. The SELinux kernel only allows these processes can only write to content with a matching MCS label, or a MCS Label of s0. A process running with the MCS level of s0:c1,c2 is not allowed to write to content with the MCS label of s0:c3,c4
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined virtual guests to use executable memory and executable stack, you must turn on the virt_use_execmem boolean. Disabled by default.
setsebool -P virt_use_execmem 1
If you want to allow confined virtual guests to interact with rawip sockets, you must turn on the virt_use_rawip boolean. Disabled by default.
setsebool -P virt_use_rawip 1
The SELinux process type svirt_tcg_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.
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.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.