Security-Enhanced Linux secures the chrome_sandbox processes via flexible mandatory access control.
If you want to allow unconfined users to transition to the chrome sandbox domains when running chrome-sandbox, you must turn on the unconfined_chrome_sandbox_transition boolean.
setsebool -P unconfined_chrome_sandbox_transition 1
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux chrome_sandbox policy is very flexible allowing users to setup their chrome_sandbox processes in as secure a method as possible.
The following file types are defined for chrome_sandbox:
chrome_sandbox_exec_t
- Set files with the chrome_sandbox_exec_t type, if you want to transition an executable to the chrome_sandbox_t domain.
chrome_sandbox_nacl_exec_t
- Set files with the chrome_sandbox_nacl_exec_t type, if you want to transition an executable to the chrome_sandbox_nacl_t domain.
chrome_sandbox_tmp_t
- Set files with the chrome_sandbox_tmp_t type, if you want to store chrome sandbox temporary files in the /tmp directories.
chrome_sandbox_tmpfs_t
- Set files with the chrome_sandbox_tmpfs_t type, if you want to store chrome sandbox files on a tmpfs file system.
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.
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux chrome_sandbox policy is very flexible allowing users to setup their chrome_sandbox processes in as secure a method as possible.
The following process types are defined for chrome_sandbox:
chrome_sandbox_t, chrome_sandbox_nacl_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process type permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.
The SELinux user type chrome_sandbox_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.
cgroup_t
/cgroup
/sys/fs/cgroup
chrome_sandbox_tmp_t
chrome_sandbox_tmpfs_t
home_cert_t
/root/.cert(/.*)?
/home/[^/]*/.kde/share/apps/networkmanagement/certificates(/.*)?
/home/[^/]*/.pki(/.*)?
/home/[^/]*/.cert(/.*)?
user_fonts_cache_t
/root/.fontconfig(/.*)?
/root/.fonts/auto(/.*)?
/root/.fonts.cache-.*
/home/[^/]*/.fontconfig(/.*)?
/home/[^/]*/.fonts/auto(/.*)?
/home/[^/]*/.fonts.cache-.*
semanage permissive can also be used to manipulate whether or not a process type is permissive.