udev_selinux(8)

1udev_selinux(8)               SELinux Policy udev              udev_selinux(8)
2
3
4

NAME

6       udev_selinux - Security Enhanced Linux Policy for the udev processes
7

DESCRIPTION

9       Security-Enhanced  Linux secures the udev processes via flexible manda‐
10       tory access control.
11
12       The udev processes execute with the udev_t SELinux type. You can  check
13       if  you  have  these processes running by executing the ps command with
14       the -Z qualifier.
15
16       For example:
17
18       ps -eZ | grep udev_t
19
20
21

ENTRYPOINTS

23       The  udev_t  SELinux  type  can  be  entered   via   the   udev_exec_t,
24       udev_helper_exec_t file types.
25
26       The default entrypoint paths for the udev_t domain are the following:
27
28       /sbin/udev,  /sbin/udevd,  /bin/udevadm, /sbin/udevadm, /sbin/udevsend,
29       /usr/sbin/udev,  /lib/udev/udevd,   /sbin/udevstart,   /usr/sbin/udevd,
30       /sbin/start_udev,  /usr/bin/udevadm,  /usr/bin/udevinfo, /usr/sbin/ude‐
31       vadm,  /lib/udev/udev-acl,   /usr/sbin/udevsend,   /usr/lib/udev/udevd,
32       /usr/sbin/udevstart,     /sbin/wait_for_sysfs,    /usr/sbin/start_udev,
33       /usr/lib/udev/udev-acl, /usr/sbin/wait_for_sysfs, /usr/lib/systemd/sys‐
34       temd-udevd,   /etc/dev.d/.+,  /etc/udev/scripts/.+,  /etc/hotplug.d/de‐
35       fault/udev.*
36

PROCESS TYPES

38       SELinux defines process types (domains) for each process running on the
39       system
40
41       You can see the context of a process using the -Z option to ps
42
43       Policy  governs  the  access confined processes have to files.  SELinux
44       udev policy is very flexible allowing users to setup  their  udev  pro‐
45       cesses in as secure a method as possible.
46
47       The following process types are defined for udev:
48
49       udev_t
50
51       Note:  semanage  permissive  -a  udev_t can be used to make the process
52       type udev_t permissive. SELinux does  not  deny  access  to  permissive
53       process  types, but the AVC (SELinux denials) messages are still gener‐
54       ated.
55
56

BOOLEANS

58       SELinux policy is customizable based on least  access  required.   udev
59       policy is extremely flexible and has several booleans that allow you to
60       manipulate the policy and run udev with the tightest access possible.
61
62
63
64       If you want to dontaudit all  daemons  scheduling  requests  (setsched,
65       sys_nice),  you  must turn on the daemons_dontaudit_scheduling boolean.
66       Enabled by default.
67
68       setsebool -P daemons_dontaudit_scheduling 1
69
70
71
72       If you want to control the ability to mmap a low area  of  the  address
73       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
74       the mmap_low_allowed boolean. Disabled by default.
75
76       setsebool -P mmap_low_allowed 1
77
78
79
80       If you want to allow system to run with  NIS,  you  must  turn  on  the
81       nis_enabled boolean. Disabled by default.
82
83       setsebool -P nis_enabled 1
84
85
86
87       If  you want to disable kernel module loading, you must turn on the se‐
88       cure_mode_insmod boolean. Disabled by default.
89
90       setsebool -P secure_mode_insmod 1
91
92
93
94       If you want to allow unconfined executables to make their  heap  memory
95       executable.   Doing  this  is  a  really bad idea. Probably indicates a
96       badly coded executable, but could indicate an attack.  This  executable
97       should  be  reported  in bugzilla, you must turn on the selinuxuser_ex‐
98       echeap boolean. Disabled by default.
99
100       setsebool -P selinuxuser_execheap 1
101
102
103
104       If you want to allow unconfined executables to make  their  stack  exe‐
105       cutable.   This  should  never, ever be necessary. Probably indicates a
106       badly coded executable, but could indicate an attack.  This  executable
107       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
108       stack boolean. Enabled by default.
109
110       setsebool -P selinuxuser_execstack 1
111
112
113

MANAGED FILES

115       The SELinux process type udev_t can manage files labeled with the  fol‐
116       lowing  file  types.   The paths listed are the default paths for these
117       file types.  Note the processes UID still need to have DAC permissions.
118
119       file_type
120
121            all files on the system
122
123

FILE CONTEXTS

125       SELinux requires files to have an extended attribute to define the file
126       type.
127
128       You can see the context of a file using the -Z option to ls
129
130       Policy  governs  the  access  confined  processes  have to these files.
131       SELinux udev policy is very flexible allowing users to setup their udev
132       processes in as secure a method as possible.
133
134       STANDARD FILE CONTEXT
135
136       SELinux  defines  the file context types for the udev, if you wanted to
137       store files with these types in a different paths, you need to  execute
138       the  semanage  command  to  specify alternate labeling and then use re‐
139       storecon to put the labels on disk.
140
141       semanage fcontext -a -t udev_exec_t '/srv/udev/content(/.*)?'
142       restorecon -R -v /srv/myudev_content
143
144       Note: SELinux often uses regular expressions  to  specify  labels  that
145       match multiple files.
146
147       The following file types are defined for udev:
148
149
150
151       udev_etc_t
152
153       -  Set  files with the udev_etc_t type, if you want to store udev files
154       in the /etc directories.
155
156
157
158       udev_exec_t
159
160       - Set files with the udev_exec_t type, if you want to transition an ex‐
161       ecutable to the udev_t domain.
162
163
164       Paths:
165            /sbin/udev,  /sbin/udevd,  /bin/udevadm, /sbin/udevadm, /sbin/ude‐
166            vsend,    /usr/sbin/udev,    /lib/udev/udevd,     /sbin/udevstart,
167            /usr/sbin/udevd,        /sbin/start_udev,        /usr/bin/udevadm,
168            /usr/bin/udevinfo,     /usr/sbin/udevadm,      /lib/udev/udev-acl,
169            /usr/sbin/udevsend,    /usr/lib/udev/udevd,   /usr/sbin/udevstart,
170            /sbin/wait_for_sysfs,  /usr/sbin/start_udev,   /usr/lib/udev/udev-
171            acl, /usr/sbin/wait_for_sysfs, /usr/lib/systemd/systemd-udevd
172
173
174       udev_helper_exec_t
175
176       - Set files with the udev_helper_exec_t type, if you want to transition
177       an executable to the udev_helper_t domain.
178
179
180       Paths:
181            /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*
182
183
184       udev_rules_t
185
186       - Set files with the udev_rules_t type, if you want to treat the  files
187       as udev rules data.
188
189
190
191       udev_tmp_t
192
193       -  Set files with the udev_tmp_t type, if you want to store udev tempo‐
194       rary files in the /tmp directories.
195
196
197
198       udev_var_run_t
199
200       - Set files with the udev_var_run_t type, if you want to store the udev
201       files under the /run or /var/run directory.
202
203
204       Paths:
205            /dev/.udev(/.*)?,   /var/run/udev(/.*)?,   /var/run/libgpod(/.*)?,
206            /var/run/PackageKit/udev(/.*)?, /dev/.udevdb, /dev/udev.tbl
207
208
209       Note: File context can be temporarily modified with the chcon  command.
210       If  you want to permanently change the file context you need to use the
211       semanage fcontext command.  This will modify the SELinux labeling data‐
212       base.  You will need to use restorecon to apply the labels.
213
214

COMMANDS

216       semanage  fcontext  can also be used to manipulate default file context
217       mappings.
218
219       semanage permissive can also be used to manipulate  whether  or  not  a
220       process type is permissive.
221
222       semanage  module can also be used to enable/disable/install/remove pol‐
223       icy modules.
224
225       semanage boolean can also be used to manipulate the booleans
226
227
228       system-config-selinux is a GUI tool available to customize SELinux pol‐
229       icy settings.
230
231

AUTHOR

233       This manual page was auto-generated using sepolicy manpage .
234
235