1udev_selinux(8)               SELinux Policy udev              udev_selinux(8)
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NAME

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

9       Security-Enhanced  Linux secures the udev processes via flexible manda‐
10       tory access control.
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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.
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16       For example:
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18       ps -eZ | grep udev_t
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ENTRYPOINTS

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

38       SELinux defines process types (domains) for each process running on the
39       system
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41       You can see the context of a process using the -Z option to ps
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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.
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47       The following process types are defined for udev:
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49       udev_t
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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.
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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.
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64       If you want to allow users to resolve user passwd entries directly from
65       ldap  rather  then  using  a  sssd server, you must turn on the authlo‐
66       gin_nsswitch_use_ldap boolean. Disabled by default.
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68       setsebool -P authlogin_nsswitch_use_ldap 1
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72       If you want to deny user domains applications to map a memory region as
73       both  executable  and  writable,  this  is dangerous and the executable
74       should be reported in bugzilla, you must turn on the deny_execmem bool‐
75       ean. Enabled by default.
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77       setsebool -P deny_execmem 1
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81       If you want to allow all domains to execute in fips_mode, you must turn
82       on the fips_mode boolean. Enabled by default.
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84       setsebool -P fips_mode 1
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87
88       If you want to allow confined applications to run  with  kerberos,  you
89       must turn on the kerberos_enabled boolean. Enabled by default.
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91       setsebool -P kerberos_enabled 1
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95       If  you  want  to control the ability to mmap a low area of the address
96       space, as configured by /proc/sys/vm/mmap_min_addr, you  must  turn  on
97       the mmap_low_allowed boolean. Disabled by default.
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99       setsebool -P mmap_low_allowed 1
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102
103       If  you  want  to  allow  system  to run with NIS, you must turn on the
104       nis_enabled boolean. Disabled by default.
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106       setsebool -P nis_enabled 1
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110       If you want to allow confined applications to use nscd  shared  memory,
111       you must turn on the nscd_use_shm boolean. Enabled by default.
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113       setsebool -P nscd_use_shm 1
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117       If  you  want  to  disable  kernel module loading, you must turn on the
118       secure_mode_insmod boolean. Enabled by default.
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120       setsebool -P secure_mode_insmod 1
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123
124       If you want to allow unconfined executables to make their  heap  memory
125       executable.   Doing  this  is  a  really bad idea. Probably indicates a
126       badly coded executable, but could indicate an attack.  This  executable
127       should   be   reported  in  bugzilla,  you  must  turn  on  the  selin‐
128       uxuser_execheap boolean. Disabled by default.
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130       setsebool -P selinuxuser_execheap 1
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133
134       If you want to allow unconfined executables to make  their  stack  exe‐
135       cutable.   This  should  never, ever be necessary. Probably indicates a
136       badly coded executable, but could indicate an attack.  This  executable
137       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
138       stack boolean. Enabled by default.
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140       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

145       The SELinux process type udev_t can manage files labeled with the  fol‐
146       lowing  file  types.   The paths listed are the default paths for these
147       file types.  Note the processes UID still need to have DAC permissions.
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149       file_type
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151            all files on the system
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FILE CONTEXTS

155       SELinux requires files to have an extended attribute to define the file
156       type.
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158       You can see the context of a file using the -Z option to ls
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160       Policy  governs  the  access  confined  processes  have to these files.
161       SELinux udev policy is very flexible allowing users to setup their udev
162       processes in as secure a method as possible.
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164       STANDARD FILE CONTEXT
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166       SELinux  defines  the file context types for the udev, if you wanted to
167       store files with these types in a diffent paths, you  need  to  execute
168       the  semanage  command  to  sepecify  alternate  labeling  and then use
169       restorecon to put the labels on disk.
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171       semanage fcontext -a -t udev_tmp_t '/srv/myudev_content(/.*)?'
172       restorecon -R -v /srv/myudev_content
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174       Note: SELinux often uses regular expressions  to  specify  labels  that
175       match multiple files.
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177       The following file types are defined for udev:
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181       udev_etc_t
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183       -  Set  files with the udev_etc_t type, if you want to store udev files
184       in the /etc directories.
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188       udev_exec_t
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190       - Set files with the udev_exec_t type, if you  want  to  transition  an
191       executable to the udev_t domain.
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194       Paths:
195            /sbin/udev,  /sbin/udevd,  /bin/udevadm, /sbin/udevadm, /sbin/ude‐
196            vsend,    /usr/sbin/udev,    /lib/udev/udevd,     /sbin/udevstart,
197            /usr/sbin/udevd,        /sbin/start_udev,        /usr/bin/udevadm,
198            /usr/bin/udevinfo,     /usr/sbin/udevadm,      /lib/udev/udev-acl,
199            /usr/sbin/udevsend,    /usr/lib/udev/udevd,   /usr/sbin/udevstart,
200            /sbin/wait_for_sysfs,  /usr/sbin/start_udev,   /usr/lib/udev/udev-
201            acl, /usr/sbin/wait_for_sysfs, /usr/lib/systemd/systemd-udevd
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204       udev_helper_exec_t
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206       - Set files with the udev_helper_exec_t type, if you want to transition
207       an executable to the udev_helper_t domain.
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210       Paths:
211            /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*
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214       udev_rules_t
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216       - Set files with the udev_rules_t type, if you want to treat the  files
217       as udev rules data.
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221       udev_tmp_t
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223       -  Set files with the udev_tmp_t type, if you want to store udev tempo‐
224       rary files in the /tmp directories.
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228       udev_var_run_t
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230       - Set files with the udev_var_run_t type, if you want to store the udev
231       files under the /run or /var/run directory.
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234       Paths:
235            /dev/.udev(/.*)?,   /var/run/udev(/.*)?,   /var/run/libgpod(/.*)?,
236            /var/run/PackageKit/udev(/.*)?, /dev/.udevdb, /dev/udev.tbl
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239       Note: File context can be temporarily modified with the chcon  command.
240       If  you want to permanently change the file context you need to use the
241       semanage fcontext command.  This will modify the SELinux labeling data‐
242       base.  You will need to use restorecon to apply the labels.
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COMMANDS

246       semanage  fcontext  can also be used to manipulate default file context
247       mappings.
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249       semanage permissive can also be used to manipulate  whether  or  not  a
250       process type is permissive.
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252       semanage  module can also be used to enable/disable/install/remove pol‐
253       icy modules.
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255       semanage boolean can also be used to manipulate the booleans
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257
258       system-config-selinux is a GUI tool available to customize SELinux pol‐
259       icy settings.
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AUTHOR

263       This manual page was auto-generated using sepolicy manpage .
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SEE ALSO

267       selinux(8), udev(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
268       setsebool(8)
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272udev                               19-10-08                    udev_selinux(8)
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