Security-Enhanced Linux secures the sandbox_x processes via flexible mandatory access control.
The sandbox_x processes execute with the sandbox_x_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
ps -eZ | grep sandbox_x_t
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 psbP
Policy governs the access confined processes have to files. SELinux sandbox_x policy is very flexible allowing users to setup their sandbox_x processes in as secure a method as possible.
The following process types are defined for sandbox_x:
sandbox_xserver_t, sandbox_x_t, sandbox_x_client_t
Note: semanage permissive -a sandbox_x_t can be used to make the process type sandbox_x_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
The SELinux process type sandbox_x_t is an MCS (Multi Category Security) constrained type. Sometimes this separation is referred to as sVirt. These types are usually used for securing multi-tenant environments, such as virtualization, containers or separation of users. The tools used to launch MCS types, pick out a different MCS label for each process group.
For example one process might be launched with sandbox_x_t:s0:c1,c2, and another process launched with sandbox_x_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
SELinux policy is customizable based on least access required. sandbox_x policy is extremely flexible and has several booleans that allow you to manipulate the policy and run sandbox_x with the tightest access possible.
If you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Enabled by default.
setsebool -P deny_execmem 1
The SELinux process type sandbox_x_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 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.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.
This manual page was auto-generated using sepolicy manpage .
selinux(8), sandbox_x(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), sandbox_x_client_selinux(8), sandbox_x_client_selinux(8)