udev_selinux(8)

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 file_type,  unlabeled_t,
24       proc_type,  filesystem_type,  mtrr_device_t,  udev_exec_t, sysctl_type,
25       udev_helper_exec_t file types.
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27       The default entrypoint paths for the udev_t domain are the following:
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29       all  files  on  the  system,  /dev/cpu/mtrr,  /sbin/udev,  /sbin/udevd,
30       /sbin/udevadm,   /sbin/udevsend,   /sbin/udevstart,   /sbin/start_udev,
31       /usr/bin/udevinfo,      /lib/udev/udev-acl,       /sbin/wait_for_sysfs,
32       /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*
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PROCESS TYPES

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

55       SELinux  policy  is  customizable based on least access required.  udev
56       policy is extremely flexible and has several booleans that allow you to
57       manipulate the policy and run udev with the tightest access possible.
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61       If you want to allow all daemons to write corefiles to /, you must turn
62       on the allow_daemons_dump_core boolean. Disabled by default.
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64       setsebool -P allow_daemons_dump_core 1
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68       If you want to allow all daemons to use tcp wrappers, you must turn  on
69       the allow_daemons_use_tcp_wrapper boolean. Disabled by default.
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71       setsebool -P allow_daemons_use_tcp_wrapper 1
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75       If  you  want to allow all daemons the ability to read/write terminals,
76       you  must  turn  on  the  allow_daemons_use_tty  boolean.  Disabled  by
77       default.
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79       setsebool -P allow_daemons_use_tty 1
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83       If you want to allow all domains to use other domains file descriptors,
84       you must turn on the allow_domain_fd_use boolean. Enabled by default.
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86       setsebool -P allow_domain_fd_use 1
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90       If you want to allow unconfined executables to make their  heap  memory
91       executable.   Doing  this  is  a  really bad idea. Probably indicates a
92       badly coded executable, but could indicate an attack.  This  executable
93       should  be  reported  in  bugzilla, you must turn on the allow_execheap
94       boolean. Disabled by default.
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96       setsebool -P allow_execheap 1
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100       If you want to allow unconfined executables to map a memory  region  as
101       both  executable  and  writable,  this  is dangerous and the executable
102       should be reported in bugzilla), you must  turn  on  the  allow_execmem
103       boolean. Enabled by default.
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105       setsebool -P allow_execmem 1
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109       If  you  want  to  allow  all  unconfined  executables to use libraries
110       requiring text relocation that are not  labeled  textrel_shlib_t),  you
111       must turn on the allow_execmod boolean. Enabled by default.
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113       setsebool -P allow_execmod 1
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117       If  you  want  to allow unconfined executables to make their stack exe‐
118       cutable.  This should never, ever be necessary.  Probably  indicates  a
119       badly  coded  executable, but could indicate an attack. This executable
120       should be reported in bugzilla), you must turn on  the  allow_execstack
121       boolean. Enabled by default.
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123       setsebool -P allow_execstack 1
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127       If  you  want  to allow confined applications to run with kerberos, you
128       must turn on the allow_kerberos boolean. Enabled by default.
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130       setsebool -P allow_kerberos 1
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134       If you want to allow sysadm to debug or ptrace all processes, you  must
135       turn on the allow_ptrace boolean. Disabled by default.
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137       setsebool -P allow_ptrace 1
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141       If  you  want  to  allow  system  to run with NIS, you must turn on the
142       allow_ypbind boolean. Disabled by default.
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144       setsebool -P allow_ypbind 1
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148       If you want to enable cluster mode for daemons, you must  turn  on  the
149       daemons_enable_cluster_mode boolean. Disabled by default.
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151       setsebool -P daemons_enable_cluster_mode 1
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155       If  you  want to allow all domains to have the kernel load modules, you
156       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
157       default.
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159       setsebool -P domain_kernel_load_modules 1
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163       If you want to allow all domains to execute in fips_mode, you must turn
164       on the fips_mode boolean. Enabled by default.
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166       setsebool -P fips_mode 1
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170       If you want to enable reading of urandom for all domains, you must turn
171       on the global_ssp boolean. Disabled by default.
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173       setsebool -P global_ssp 1
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177       If you want to enable support for upstart as the init program, you must
178       turn on the init_upstart boolean. Enabled by default.
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180       setsebool -P init_upstart 1
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184       If you want to allow certain domains to map low memory in  the  kernel,
185       you must turn on the mmap_low_allowed boolean. Disabled by default.
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187       setsebool -P mmap_low_allowed 1
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191       If  you  want to allow confined applications to use nscd shared memory,
192       you must turn on the nscd_use_shm boolean. Enabled by default.
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194       setsebool -P nscd_use_shm 1
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198       If you want to disable transitions to insmod,  you  must  turn  on  the
199       secure_mode_insmod boolean. Disabled by default.
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201       setsebool -P secure_mode_insmod 1
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205       If  you want to boolean to determine whether the system permits loading
206       policy, setting enforcing mode, and changing boolean values.  Set  this
207       to  true  and  you  have to reboot to set it back, you must turn on the
208       secure_mode_policyload boolean. Disabled by default.
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210       setsebool -P secure_mode_policyload 1
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214       If you want to support X userspace object manager, you must turn on the
215       xserver_object_manager boolean. Disabled by default.
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217       setsebool -P xserver_object_manager 1
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MANAGED FILES

222       The  SELinux process type udev_t can manage files labeled with the fol‐
223       lowing file types.  The paths listed are the default  paths  for  these
224       file types.  Note the processes UID still need to have DAC permissions.
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226       file_type
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228            all files on the system
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FILE CONTEXTS

232       SELinux requires files to have an extended attribute to define the file
233       type.
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235       You can see the context of a file using the -Z option to ls
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237       Policy governs the access  confined  processes  have  to  these  files.
238       SELinux udev policy is very flexible allowing users to setup their udev
239       processes in as secure a method as possible.
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241       STANDARD FILE CONTEXT
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243       SELinux defines the file context types for the udev, if you  wanted  to
244       store  files  with  these types in a diffent paths, you need to execute
245       the semanage command  to  sepecify  alternate  labeling  and  then  use
246       restorecon to put the labels on disk.
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248       semanage fcontext -a -t udev_var_run_t '/srv/myudev_content(/.*)?'
249       restorecon -R -v /srv/myudev_content
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251       Note:  SELinux  often  uses  regular expressions to specify labels that
252       match multiple files.
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254       The following file types are defined for udev:
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258       udev_etc_t
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260       - Set files with the udev_etc_t type, if you want to store  udev  files
261       in the /etc directories.
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265       udev_exec_t
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267       -  Set  files  with  the udev_exec_t type, if you want to transition an
268       executable to the udev_t domain.
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271       Paths:
272            /sbin/udev, /sbin/udevd, /sbin/udevadm, /sbin/udevsend, /sbin/ude‐
273            vstart,  /sbin/start_udev,  /usr/bin/udevinfo, /lib/udev/udev-acl,
274            /sbin/wait_for_sysfs
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277       udev_helper_exec_t
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279       - Set files with the udev_helper_exec_t type, if you want to transition
280       an executable to the udev_helper_t domain.
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283       Paths:
284            /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*
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287       udev_tbl_t
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289       - Set files with the udev_tbl_t type, if you want to treat the files as
290       udev tbl data.
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293       Paths:
294            /dev/.udev(/.*)?, /dev/.udevdb, /dev/udev.tbl
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297       udev_var_run_t
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299       - Set files with the udev_var_run_t type, if you want to store the udev
300       files under the /run or /var/run directory.
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303       Paths:
304            /etc/udev/rules.d(/.*)?,   /var/run/libgpod(/.*)?,  /var/run/Pack‐
305            ageKit/udev(/.*)?
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308       Note: File context can be temporarily modified with the chcon  command.
309       If  you want to permanently change the file context you need to use the
310       semanage fcontext command.  This will modify the SELinux labeling data‐
311       base.  You will need to use restorecon to apply the labels.
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COMMANDS

315       semanage  fcontext  can also be used to manipulate default file context
316       mappings.
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318       semanage permissive can also be used to manipulate  whether  or  not  a
319       process type is permissive.
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321       semanage  module can also be used to enable/disable/install/remove pol‐
322       icy modules.
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324       semanage boolean can also be used to manipulate the booleans
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327       system-config-selinux is a GUI tool available to customize SELinux pol‐
328       icy settings.
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AUTHOR

332       This manual page was auto-generated using sepolicy manpage .
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