1init_selinux(8) SELinux Policy init init_selinux(8)
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6 init_selinux - Security Enhanced Linux Policy for the init processes
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9 Security-Enhanced Linux secures the init processes via flexible manda‐
10 tory access control.
11 The init processes execute with the init_t SELinux type. You can check
13 if you have these processes running by executing the ps command with
14 the -Z qualifier.
15 For example:
17 ps -eZ | grep init_t
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23 The init_t SELinux type can be entered via the file_type, unlabeled_t,
24 proc_type, filesystem_type, mtrr_device_t, init_exec_t, sysctl_type
25 file types.
26 The default entrypoint paths for the init_t domain are the following:
28 all files on the system, /dev/cpu/mtrr, /sbin/init(ng)?
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32 SELinux defines process types (domains) for each process running on the
33 system
34 You can see the context of a process using the -Z option to ps
36 Policy governs the access confined processes have to files. SELinux
38 init policy is very flexible allowing users to setup their init pro‐
39 cesses in as secure a method as possible.
40 The following process types are defined for init:
42 initrc_t, init_t
44 Note: semanage permissive -a init_t can be used to make the process
46 type init_t permissive. SELinux does not deny access to permissive
47 process types, but the AVC (SELinux denials) messages are still gener‐
48 ated.
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52 SELinux policy is customizable based on least access required. init
53 policy is extremely flexible and has several booleans that allow you to
54 manipulate the policy and run init with the tightest access possible.
55 If you want to enable support for upstart as the init program, you must
59 turn on the init_upstart boolean. Enabled by default.
60 setsebool -P init_upstart 1
62 If you want to allow all domains to use other domains file descriptors,
66 you must turn on the allow_domain_fd_use boolean. Enabled by default.
67 setsebool -P allow_domain_fd_use 1
69 If you want to allow unconfined executables to make their heap memory
73 executable. Doing this is a really bad idea. Probably indicates a
74 badly coded executable, but could indicate an attack. This executable
75 should be reported in bugzilla, you must turn on the allow_execheap
76 boolean. Disabled by default.
77 setsebool -P allow_execheap 1
79 If you want to allow unconfined executables to map a memory region as
83 both executable and writable, this is dangerous and the executable
84 should be reported in bugzilla), you must turn on the allow_execmem
85 boolean. Enabled by default.
86 setsebool -P allow_execmem 1
88 If you want to allow all unconfined executables to use libraries
92 requiring text relocation that are not labeled textrel_shlib_t), you
93 must turn on the allow_execmod boolean. Enabled by default.
94 setsebool -P allow_execmod 1
96 If you want to allow unconfined executables to make their stack exe‐
100 cutable. This should never, ever be necessary. Probably indicates a
101 badly coded executable, but could indicate an attack. This executable
102 should be reported in bugzilla), you must turn on the allow_execstack
103 boolean. Enabled by default.
104 setsebool -P allow_execstack 1
106 If you want to allow sysadm to debug or ptrace all processes, you must
110 turn on the allow_ptrace boolean. Disabled by default.
111 setsebool -P allow_ptrace 1
113 If you want to allow all domains to have the kernel load modules, you
117 must turn on the domain_kernel_load_modules boolean. Disabled by
118 default.
119 setsebool -P domain_kernel_load_modules 1
121 If you want to allow all domains to execute in fips_mode, you must turn
125 on the fips_mode boolean. Enabled by default.
126 setsebool -P fips_mode 1
128 If you want to enable reading of urandom for all domains, you must turn
132 on the global_ssp boolean. Disabled by default.
133 setsebool -P global_ssp 1
135 If you want to allow certain domains to map low memory in the kernel,
139 you must turn on the mmap_low_allowed boolean. Disabled by default.
140 setsebool -P mmap_low_allowed 1
142 If you want to boolean to determine whether the system permits loading
146 policy, setting enforcing mode, and changing boolean values. Set this
147 to true and you have to reboot to set it back, you must turn on the
148 secure_mode_policyload boolean. Disabled by default.
149 setsebool -P secure_mode_policyload 1
151 If you want to support X userspace object manager, you must turn on the
155 xserver_object_manager boolean. Disabled by default.
156 setsebool -P xserver_object_manager 1
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162 The SELinux process type init_t can manage files labeled with the fol‐
163 lowing file types. The paths listed are the default paths for these
164 file types. Note the processes UID still need to have DAC permissions.
165 file_type
167 all files on the system
169
172 SELinux requires files to have an extended attribute to define the file
173 type.
174 You can see the context of a file using the -Z option to ls
176 Policy governs the access confined processes have to these files.
178 SELinux init policy is very flexible allowing users to setup their init
179 processes in as secure a method as possible.
180 STANDARD FILE CONTEXT
182 SELinux defines the file context types for the init, if you wanted to
184 store files with these types in a diffent paths, you need to execute
185 the semanage command to sepecify alternate labeling and then use
186 restorecon to put the labels on disk.
187 semanage fcontext -a -t initrc_var_run_t '/srv/myinit_content(/.*)?'
189 restorecon -R -v /srv/myinit_content
190 Note: SELinux often uses regular expressions to specify labels that
192 match multiple files.
193 The following file types are defined for init:
195 init_exec_t
199 - Set files with the init_exec_t type, if you want to transition an
201 executable to the init_t domain.
202 init_var_run_t
206 - Set files with the init_var_run_t type, if you want to store the init
208 files under the /run or /var/run directory.
209 initctl_t
213 - Set files with the initctl_t type, if you want to treat the files as
215 initctl data.
216 initrc_devpts_t
220 - Set files with the initrc_devpts_t type, if you want to treat the
222 files as initrc devpts data.
223 initrc_exec_t
227 - Set files with the initrc_exec_t type, if you want to transition an
229 executable to the initrc_t domain.
230 Paths:
233 /etc/init.d/.*, /etc/rc.d/rc.[^/]+, /etc/rc.d/init.d/.*,
234 /usr/libexec/dcc/stop-.*, /usr/libexec/dcc/start-.*, /etc/rc.d/rc,
235 /etc/X11/prefdm, /usr/sbin/startx, /usr/bin/sepg_ctl,
236 /usr/sbin/apachectl, /usr/sbin/ldap-agent, /usr/sbin/start-dirsrv,
237 /usr/sbin/open_init_pty, /usr/sbin/restart-dirsrv, /etc/syscon‐
238 fig/network-scripts/ifup-ipsec, /usr/share/system-config-ser‐
239 vices/system-config-services-mechanism.py
240 initrc_state_t
243 - Set files with the initrc_state_t type, if you want to treat the
245 files as initrc state data.
246 initrc_tmp_t
250 - Set files with the initrc_tmp_t type, if you want to store initrc
252 temporary files in the /tmp directories.
253 initrc_var_run_t
257 - Set files with the initrc_var_run_t type, if you want to store the
259 initrc files under the /run or /var/run directory.
260 Paths:
263 /var/run/utmp, /var/run/random-seed, /var/run/runlevel.dir,
264 /var/run/setmixer_flag
265 Note: File context can be temporarily modified with the chcon command.
268 If you want to permanently change the file context you need to use the
269 semanage fcontext command. This will modify the SELinux labeling data‐
270 base. You will need to use restorecon to apply the labels.
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274 semanage fcontext can also be used to manipulate default file context
275 mappings.
276 semanage permissive can also be used to manipulate whether or not a
278 process type is permissive.
279 semanage module can also be used to enable/disable/install/remove pol‐
281 icy modules.
282 semanage boolean can also be used to manipulate the booleans
284 system-config-selinux is a GUI tool available to customize SELinux pol‐
287 icy settings.
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291 This manual page was auto-generated using sepolicy manpage .
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295 selinux(8), init(8), semanage(8), restorecon(8), chcon(1) , setse‐
296 bool(8)
297init 15-06-03 init_selinux(8)