1insmod_selinux(8) SELinux Policy insmod insmod_selinux(8)
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6 insmod_selinux - Security Enhanced Linux Policy for the insmod pro‐
7 cesses
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10 Security-Enhanced Linux secures the insmod processes via flexible
11 mandatory access control.
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13 The insmod processes execute with the insmod_t SELinux type. You can
14 check if you have these processes running by executing the ps command
15 with the -Z qualifier.
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17 For example:
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19 ps -eZ | grep insmod_t
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24 The insmod_t SELinux type can be entered via the insmod_exec_t file
25 type.
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27 The default entrypoint paths for the insmod_t domain are the following:
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29 /sbin/rmmod.*, /sbin/insmod.*, /sbin/modprobe.*, /usr/sbin/rmmod.*,
30 /usr/sbin/insmod.*, /usr/sbin/modprobe.*, /bin/kmod, /usr/bin/kmod
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33 SELinux defines process types (domains) for each process running on the
34 system
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36 You can see the context of a process using the -Z option to ps
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38 Policy governs the access confined processes have to files. SELinux
39 insmod policy is very flexible allowing users to setup their insmod
40 processes in as secure a method as possible.
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42 The following process types are defined for insmod:
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44 insmod_t
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46 Note: semanage permissive -a insmod_t can be used to make the process
47 type insmod_t permissive. SELinux does not deny access to permissive
48 process types, but the AVC (SELinux denials) messages are still gener‐
49 ated.
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53 SELinux policy is customizable based on least access required. insmod
54 policy is extremely flexible and has several booleans that allow you to
55 manipulate the policy and run insmod with the tightest access possible.
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59 If you want to allow users to resolve user passwd entries directly from
60 ldap rather then using a sssd server, you must turn on the authlo‐
61 gin_nsswitch_use_ldap boolean. Disabled by default.
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63 setsebool -P authlogin_nsswitch_use_ldap 1
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67 If you want to deny user domains applications to map a memory region as
68 both executable and writable, this is dangerous and the executable
69 should be reported in bugzilla, you must turn on the deny_execmem bool‐
70 ean. Enabled by default.
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72 setsebool -P deny_execmem 1
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76 If you want to deny any process from ptracing or debugging any other
77 processes, you must turn on the deny_ptrace boolean. Enabled by
78 default.
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80 setsebool -P deny_ptrace 1
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84 If you want to allow any process to mmap any file on system with
85 attribute file_type, you must turn on the domain_can_mmap_files bool‐
86 ean. Enabled by default.
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88 setsebool -P domain_can_mmap_files 1
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92 If you want to allow all domains write to kmsg_device, while kernel is
93 executed with systemd.log_target=kmsg parameter, you must turn on the
94 domain_can_write_kmsg boolean. Disabled by default.
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96 setsebool -P domain_can_write_kmsg 1
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100 If you want to allow all domains to use other domains file descriptors,
101 you must turn on the domain_fd_use boolean. Enabled by default.
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103 setsebool -P domain_fd_use 1
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107 If you want to allow all domains to have the kernel load modules, you
108 must turn on the domain_kernel_load_modules boolean. Disabled by
109 default.
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111 setsebool -P domain_kernel_load_modules 1
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115 If you want to allow all domains to execute in fips_mode, you must turn
116 on the fips_mode boolean. Enabled by default.
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118 setsebool -P fips_mode 1
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122 If you want to enable reading of urandom for all domains, you must turn
123 on the global_ssp boolean. Disabled by default.
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125 setsebool -P global_ssp 1
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129 If you want to allow confined applications to run with kerberos, you
130 must turn on the kerberos_enabled boolean. Enabled by default.
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132 setsebool -P kerberos_enabled 1
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136 If you want to control the ability to mmap a low area of the address
137 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
138 the mmap_low_allowed boolean. Disabled by default.
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140 setsebool -P mmap_low_allowed 1
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144 If you want to allow system to run with NIS, you must turn on the
145 nis_enabled boolean. Disabled by default.
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147 setsebool -P nis_enabled 1
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151 If you want to allow confined applications to use nscd shared memory,
152 you must turn on the nscd_use_shm boolean. Disabled by default.
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154 setsebool -P nscd_use_shm 1
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158 If you want to allow pppd to load kernel modules for certain modems,
159 you must turn on the pppd_can_insmod boolean. Disabled by default.
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161 setsebool -P pppd_can_insmod 1
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165 If you want to disable kernel module loading, you must turn on the
166 secure_mode_insmod boolean. Enabled by default.
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168 setsebool -P secure_mode_insmod 1
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172 If you want to boolean to determine whether the system permits loading
173 policy, setting enforcing mode, and changing boolean values. Set this
174 to true and you have to reboot to set it back, you must turn on the
175 secure_mode_policyload boolean. Enabled by default.
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177 setsebool -P secure_mode_policyload 1
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181 If you want to allow unconfined executables to make their heap memory
182 executable. Doing this is a really bad idea. Probably indicates a
183 badly coded executable, but could indicate an attack. This executable
184 should be reported in bugzilla, you must turn on the selin‐
185 uxuser_execheap boolean. Disabled by default.
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187 setsebool -P selinuxuser_execheap 1
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191 If you want to allow all unconfined executables to use libraries
192 requiring text relocation that are not labeled textrel_shlib_t, you
193 must turn on the selinuxuser_execmod boolean. Enabled by default.
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195 setsebool -P selinuxuser_execmod 1
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199 If you want to allow unconfined executables to make their stack exe‐
200 cutable. This should never, ever be necessary. Probably indicates a
201 badly coded executable, but could indicate an attack. This executable
202 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
203 stack boolean. Enabled by default.
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205 setsebool -P selinuxuser_execstack 1
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209 If you want to support X userspace object manager, you must turn on the
210 xserver_object_manager boolean. Enabled by default.
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212 setsebool -P xserver_object_manager 1
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217 The SELinux process type insmod_t can manage files labeled with the
218 following file types. The paths listed are the default paths for these
219 file types. Note the processes UID still need to have DAC permissions.
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221 file_type
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223 all files on the system
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227 SELinux requires files to have an extended attribute to define the file
228 type.
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230 You can see the context of a file using the -Z option to ls
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232 Policy governs the access confined processes have to these files.
233 SELinux insmod policy is very flexible allowing users to setup their
234 insmod processes in as secure a method as possible.
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236 STANDARD FILE CONTEXT
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238 SELinux defines the file context types for the insmod, if you wanted to
239 store files with these types in a diffent paths, you need to execute
240 the semanage command to sepecify alternate labeling and then use
241 restorecon to put the labels on disk.
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243 semanage fcontext -a -t insmod_var_run_t '/srv/myinsmod_content(/.*)?'
244 restorecon -R -v /srv/myinsmod_content
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246 Note: SELinux often uses regular expressions to specify labels that
247 match multiple files.
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249 The following file types are defined for insmod:
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253 insmod_exec_t
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255 - Set files with the insmod_exec_t type, if you want to transition an
256 executable to the insmod_t domain.
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259 Paths:
260 /sbin/rmmod.*, /sbin/insmod.*, /sbin/modprobe.*,
261 /usr/sbin/rmmod.*, /usr/sbin/insmod.*, /usr/sbin/modprobe.*,
262 /bin/kmod, /usr/bin/kmod
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265 insmod_tmpfs_t
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267 - Set files with the insmod_tmpfs_t type, if you want to store insmod
268 files on a tmpfs file system.
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272 insmod_var_run_t
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274 - Set files with the insmod_var_run_t type, if you want to store the
275 insmod files under the /run or /var/run directory.
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279 Note: File context can be temporarily modified with the chcon command.
280 If you want to permanently change the file context you need to use the
281 semanage fcontext command. This will modify the SELinux labeling data‐
282 base. You will need to use restorecon to apply the labels.
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286 semanage fcontext can also be used to manipulate default file context
287 mappings.
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289 semanage permissive can also be used to manipulate whether or not a
290 process type is permissive.
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292 semanage module can also be used to enable/disable/install/remove pol‐
293 icy modules.
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295 semanage boolean can also be used to manipulate the booleans
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298 system-config-selinux is a GUI tool available to customize SELinux pol‐
299 icy settings.
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303 This manual page was auto-generated using sepolicy manpage .
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307 selinux(8), insmod(8), semanage(8), restorecon(8), chcon(1), sepol‐
308 icy(8) , setsebool(8)
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312insmod 19-04-25 insmod_selinux(8)