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  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 control the ability to mmap a low area  of  the  address
65       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
66       the mmap_low_allowed boolean. Disabled by default.
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68       setsebool -P mmap_low_allowed 1
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72       If you want to disable kernel module loading, you must turn on the  se‐
73       cure_mode_insmod boolean. Enabled by default.
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75       setsebool -P secure_mode_insmod 1
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79       If  you  want to allow unconfined executables to make their heap memory
80       executable.  Doing this is a really  bad  idea.  Probably  indicates  a
81       badly  coded  executable, but could indicate an attack. This executable
82       should be reported in bugzilla, you must turn  on  the  selinuxuser_ex‐
83       echeap boolean. Disabled by default.
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85       setsebool -P selinuxuser_execheap 1
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89       If  you  want  to allow unconfined executables to make their stack exe‐
90       cutable.  This should never, ever be necessary.  Probably  indicates  a
91       badly  coded  executable, but could indicate an attack. This executable
92       should be reported in bugzilla, you must turn on the  selinuxuser_exec‐
93       stack boolean. Enabled by default.
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95       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

100       The  SELinux process type udev_t can manage files labeled with the fol‐
101       lowing file types.  The paths listed are the default  paths  for  these
102       file types.  Note the processes UID still need to have DAC permissions.
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104       file_type
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106            all files on the system
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FILE CONTEXTS

110       SELinux requires files to have an extended attribute to define the file
111       type.
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113       You can see the context of a file using the -Z option to ls
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115       Policy governs the access  confined  processes  have  to  these  files.
116       SELinux udev policy is very flexible allowing users to setup their udev
117       processes in as secure a method as possible.
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119       STANDARD FILE CONTEXT
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121       SELinux defines the file context types for the udev, if you  wanted  to
122       store  files  with  these types in a diffent paths, you need to execute
123       the semanage command to sepecify alternate labeling and  then  use  re‐
124       storecon to put the labels on disk.
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126       semanage fcontext -a -t udev_tmp_t '/srv/myudev_content(/.*)?'
127       restorecon -R -v /srv/myudev_content
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129       Note:  SELinux  often  uses  regular expressions to specify labels that
130       match multiple files.
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132       The following file types are defined for udev:
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136       udev_etc_t
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138       - Set files with the udev_etc_t type, if you want to store  udev  files
139       in the /etc directories.
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143       udev_exec_t
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145       - Set files with the udev_exec_t type, if you want to transition an ex‐
146       ecutable to the udev_t domain.
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149       Paths:
150            /sbin/udev, /sbin/udevd, /bin/udevadm,  /sbin/udevadm,  /sbin/ude‐
151            vsend,     /usr/sbin/udev,    /lib/udev/udevd,    /sbin/udevstart,
152            /usr/sbin/udevd,        /sbin/start_udev,        /usr/bin/udevadm,
153            /usr/bin/udevinfo,      /usr/sbin/udevadm,     /lib/udev/udev-acl,
154            /usr/sbin/udevsend,   /usr/lib/udev/udevd,    /usr/sbin/udevstart,
155            /sbin/wait_for_sysfs,   /usr/sbin/start_udev,  /usr/lib/udev/udev-
156            acl, /usr/sbin/wait_for_sysfs, /usr/lib/systemd/systemd-udevd
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159       udev_helper_exec_t
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161       - Set files with the udev_helper_exec_t type, if you want to transition
162       an executable to the udev_helper_t domain.
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165       Paths:
166            /etc/dev.d/.+, /etc/udev/scripts/.+, /etc/hotplug.d/default/udev.*
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169       udev_rules_t
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171       -  Set files with the udev_rules_t type, if you want to treat the files
172       as udev rules data.
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176       udev_tmp_t
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178       - Set files with the udev_tmp_t type, if you want to store udev  tempo‐
179       rary files in the /tmp directories.
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183       udev_var_run_t
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185       - Set files with the udev_var_run_t type, if you want to store the udev
186       files under the /run or /var/run directory.
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189       Paths:
190            /dev/.udev(/.*)?,   /var/run/udev(/.*)?,   /var/run/libgpod(/.*)?,
191            /var/run/PackageKit/udev(/.*)?, /dev/.udevdb, /dev/udev.tbl
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194       Note:  File context can be temporarily modified with the chcon command.
195       If you want to permanently change the file context you need to use  the
196       semanage fcontext command.  This will modify the SELinux labeling data‐
197       base.  You will need to use restorecon to apply the labels.
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COMMANDS

201       semanage fcontext can also be used to manipulate default  file  context
202       mappings.
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204       semanage  permissive  can  also  be used to manipulate whether or not a
205       process type is permissive.
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207       semanage module can also be used to enable/disable/install/remove  pol‐
208       icy modules.
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210       semanage boolean can also be used to manipulate the booleans
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213       system-config-selinux is a GUI tool available to customize SELinux pol‐
214       icy settings.
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AUTHOR

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