1kmod_selinux(8) SELinux Policy kmod kmod_selinux(8)
2
6 kmod_selinux - Security Enhanced Linux Policy for the kmod processes
7
9 Security-Enhanced Linux secures the kmod processes via flexible manda‐
10 tory access control.
11 The kmod processes execute with the kmod_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 kmod_t
19
23 The kmod_t SELinux type can be entered via the kmod_exec_t file type.
24 The default entrypoint paths for the kmod_t domain are the following:
26 /sbin/rmmod.*, /sbin/depmod.*, /sbin/insmod.*, /sbin/modprobe.*,
28 /usr/sbin/rmmod.*, /usr/sbin/depmod.*, /usr/sbin/insmod.*,
29 /usr/sbin/modprobe.*, /bin/kmod, /usr/bin/kmod, /sbin/modules-update,
30 /sbin/update-modules, /usr/sbin/modules-update, /usr/sbin/update-mod‐
31 ules, /sbin/generate-modprobe.conf, /usr/sbin/generate-modprobe.conf
32
34 SELinux defines process types (domains) for each process running on the
35 system
36 You can see the context of a process using the -Z option to ps
38 Policy governs the access confined processes have to files. SELinux
40 kmod policy is very flexible allowing users to setup their kmod pro‐
41 cesses in as secure a method as possible.
42 The following process types are defined for kmod:
44 kmod_t
46 Note: semanage permissive -a kmod_t can be used to make the process
48 type kmod_t permissive. SELinux does not deny access to permissive
49 process types, but the AVC (SELinux denials) messages are still gener‐
50 ated.
51
54 SELinux policy is customizable based on least access required. kmod
55 policy is extremely flexible and has several booleans that allow you to
56 manipulate the policy and run kmod with the tightest access possible.
57 If you want to control the ability to mmap a low area of the address
61 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
62 the mmap_low_allowed boolean. Disabled by default.
63 setsebool -P mmap_low_allowed 1
65 If you want to allow system to run with NIS, you must turn on the
69 nis_enabled boolean. Disabled by default.
70 setsebool -P nis_enabled 1
72 If you want to disable kernel module loading, you must turn on the se‐
76 cure_mode_insmod boolean. Disabled by default.
77 setsebool -P secure_mode_insmod 1
79 If you want to allow unconfined executables to make their heap memory
83 executable. Doing this is a really bad idea. Probably indicates a
84 badly coded executable, but could indicate an attack. This executable
85 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
86 echeap boolean. Disabled by default.
87 setsebool -P selinuxuser_execheap 1
89 If you want to allow unconfined executables to make their stack exe‐
93 cutable. This should never, ever be necessary. Probably indicates a
94 badly coded executable, but could indicate an attack. This executable
95 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
96 stack boolean. Enabled by default.
97 setsebool -P selinuxuser_execstack 1
99
103 The SELinux process type kmod_t can manage files labeled with the fol‐
104 lowing file types. The paths listed are the default paths for these
105 file types. Note the processes UID still need to have DAC permissions.
106 file_type
108 all files on the system
110
113 SELinux requires files to have an extended attribute to define the file
114 type.
115 You can see the context of a file using the -Z option to ls
117 Policy governs the access confined processes have to these files.
119 SELinux kmod policy is very flexible allowing users to setup their kmod
120 processes in as secure a method as possible.
121 STANDARD FILE CONTEXT
123 SELinux defines the file context types for the kmod, if you wanted to
125 store files with these types in a different paths, you need to execute
126 the semanage command to specify alternate labeling and then use re‐
127 storecon to put the labels on disk.
128 semanage fcontext -a -t kmod_exec_t '/srv/kmod/content(/.*)?'
130 restorecon -R -v /srv/mykmod_content
131 Note: SELinux often uses regular expressions to specify labels that
133 match multiple files.
134 The following file types are defined for kmod:
136 kmod_exec_t
140 - Set files with the kmod_exec_t type, if you want to transition an ex‐
142 ecutable to the kmod_t domain.
143 Paths:
146 /sbin/rmmod.*, /sbin/depmod.*, /sbin/insmod.*, /sbin/modprobe.*,
147 /usr/sbin/rmmod.*, /usr/sbin/depmod.*, /usr/sbin/insmod.*,
148 /usr/sbin/modprobe.*, /bin/kmod, /usr/bin/kmod, /sbin/modules-up‐
149 date, /sbin/update-modules, /usr/sbin/modules-update,
150 /usr/sbin/update-modules, /sbin/generate-modprobe.conf,
151 /usr/sbin/generate-modprobe.conf
152 kmod_tmp_t
155 - Set files with the kmod_tmp_t type, if you want to store kmod tempo‐
157 rary files in the /tmp directories.
158 kmod_tmpfs_t
162 - Set files with the kmod_tmpfs_t type, if you want to store kmod files
164 on a tmpfs file system.
165 kmod_var_run_t
169 - Set files with the kmod_var_run_t type, if you want to store the kmod
171 files under the /run or /var/run directory.
172 Paths:
175 /var/run/tmpfiles.d/kmod.conf, /var/run/tmpfiles.d/static-
176 nodes.conf
177 Note: File context can be temporarily modified with the chcon command.
180 If you want to permanently change the file context you need to use the
181 semanage fcontext command. This will modify the SELinux labeling data‐
182 base. You will need to use restorecon to apply the labels.
183
186 semanage fcontext can also be used to manipulate default file context
187 mappings.
188 semanage permissive can also be used to manipulate whether or not a
190 process type is permissive.
191 semanage module can also be used to enable/disable/install/remove pol‐
193 icy modules.
194 semanage boolean can also be used to manipulate the booleans
196 system-config-selinux is a GUI tool available to customize SELinux pol‐
199 icy settings.
200
203 This manual page was auto-generated using sepolicy manpage .
204
207 selinux(8), kmod(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
208 setsebool(8)
209kmod 23-10-20 kmod_selinux(8)