1kmod_selinux(8) SELinux Policy kmod kmod_selinux(8)
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6 kmod_selinux - Security Enhanced Linux Policy for the kmod processes
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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
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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 disable kernel module loading, you must turn on the se‐
69 cure_mode_insmod boolean. Enabled by default.
70 setsebool -P secure_mode_insmod 1
72 If you want to allow unconfined executables to make their heap memory
76 executable. Doing this is a really bad idea. Probably indicates a
77 badly coded executable, but could indicate an attack. This executable
78 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
79 echeap boolean. Disabled by default.
80 setsebool -P selinuxuser_execheap 1
82 If you want to allow unconfined executables to make their stack exe‐
86 cutable. This should never, ever be necessary. Probably indicates a
87 badly coded executable, but could indicate an attack. This executable
88 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
89 stack boolean. Enabled by default.
90 setsebool -P selinuxuser_execstack 1
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96 The SELinux process type kmod_t can manage files labeled with the fol‐
97 lowing file types. The paths listed are the default paths for these
98 file types. Note the processes UID still need to have DAC permissions.
99 file_type
101 all files on the system
103
106 SELinux requires files to have an extended attribute to define the file
107 type.
108 You can see the context of a file using the -Z option to ls
110 Policy governs the access confined processes have to these files.
112 SELinux kmod policy is very flexible allowing users to setup their kmod
113 processes in as secure a method as possible.
114 STANDARD FILE CONTEXT
116 SELinux defines the file context types for the kmod, if you wanted to
118 store files with these types in a diffent paths, you need to execute
119 the semanage command to specify alternate labeling and then use re‐
120 storecon to put the labels on disk.
121 semanage fcontext -a -t kmod_tmpfs_t '/srv/mykmod_content(/.*)?'
123 restorecon -R -v /srv/mykmod_content
124 Note: SELinux often uses regular expressions to specify labels that
126 match multiple files.
127 The following file types are defined for kmod:
129 kmod_exec_t
133 - Set files with the kmod_exec_t type, if you want to transition an ex‐
135 ecutable to the kmod_t domain.
136 Paths:
139 /sbin/rmmod.*, /sbin/depmod.*, /sbin/insmod.*, /sbin/modprobe.*,
140 /usr/sbin/rmmod.*, /usr/sbin/depmod.*, /usr/sbin/insmod.*,
141 /usr/sbin/modprobe.*, /bin/kmod, /usr/bin/kmod, /sbin/modules-up‐
142 date, /sbin/update-modules, /usr/sbin/modules-update,
143 /usr/sbin/update-modules, /sbin/generate-modprobe.conf,
144 /usr/sbin/generate-modprobe.conf
145 kmod_tmp_t
148 - Set files with the kmod_tmp_t type, if you want to store kmod tempo‐
150 rary files in the /tmp directories.
151 kmod_tmpfs_t
155 - Set files with the kmod_tmpfs_t type, if you want to store kmod files
157 on a tmpfs file system.
158 kmod_var_run_t
162 - Set files with the kmod_var_run_t type, if you want to store the kmod
164 files under the /run or /var/run directory.
165 Note: File context can be temporarily modified with the chcon command.
169 If you want to permanently change the file context you need to use the
170 semanage fcontext command. This will modify the SELinux labeling data‐
171 base. You will need to use restorecon to apply the labels.
172
175 semanage fcontext can also be used to manipulate default file context
176 mappings.
177 semanage permissive can also be used to manipulate whether or not a
179 process type is permissive.
180 semanage module can also be used to enable/disable/install/remove pol‐
182 icy modules.
183 semanage boolean can also be used to manipulate the booleans
185 system-config-selinux is a GUI tool available to customize SELinux pol‐
188 icy settings.
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192 This manual page was auto-generated using sepolicy manpage .
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196 selinux(8), kmod(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
197 setsebool(8)
198kmod 23-02-03 kmod_selinux(8)