mount_selinux(8)

1mount_selinux(8)             SELinux Policy mount             mount_selinux(8)
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NAME

6       mount_selinux - Security Enhanced Linux Policy for the mount processes
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DESCRIPTION

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

23       The mount_t SELinux type can  be  entered  via  the  fusermount_exec_t,
24       mount_exec_t file types.
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26       The default entrypoint paths for the mount_t domain are the following:
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28       /bin/fusermount[0-9]?,     /usr/bin/fusermount[0-9]?,     /bin/mount.*,
29       /bin/umount.*,   /sbin/mount.*,    /sbin/umount.*,    /usr/bin/mount.*,
30       /usr/bin/umount.*, /usr/sbin/mount.*, /usr/sbin/umount.*
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PROCESS TYPES

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

53       SELinux  policy  is customizable based on least access required.  mount
54       policy is extremely flexible and has several booleans that allow you to
55       manipulate the policy and run mount with the tightest access possible.
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59       If you want to deny user domains applications to map a memory region as
60       both executable and writable, this  is  dangerous  and  the  executable
61       should be reported in bugzilla, you must turn on the deny_execmem bool‐
62       ean. Disabled by default.
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64       setsebool -P deny_execmem 1
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68       If you want to control the ability to mmap a low area  of  the  address
69       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
70       the mmap_low_allowed boolean. Disabled by default.
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72       setsebool -P mmap_low_allowed 1
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76       If you want to allow system to run with  NIS,  you  must  turn  on  the
77       nis_enabled boolean. Disabled by default.
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79       setsebool -P nis_enabled 1
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83       If  you want to disable kernel module loading, you must turn on the se‐
84       cure_mode_insmod boolean. Disabled by default.
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86       setsebool -P secure_mode_insmod 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 selinuxuser_ex‐
94       echeap boolean. Disabled by default.
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96       setsebool -P selinuxuser_execheap 1
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100       If you want to allow unconfined executables to make  their  stack  exe‐
101       cutable.   This  should  never, ever be necessary. Probably indicates a
102       badly coded executable, but could indicate an attack.  This  executable
103       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
104       stack boolean. Enabled by default.
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106       setsebool -P selinuxuser_execstack 1
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PORT TYPES

111       SELinux defines port types to represent TCP and UDP ports.
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113       You can see the types associated with a port  by  using  the  following
114       command:
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116       semanage port -l
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119       Policy  governs  the  access  confined  processes  have to these ports.
120       SELinux mount policy is very flexible allowing  users  to  setup  their
121       mount processes in as secure a method as possible.
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123       The following port types are defined for mount:
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126       mountd_port_t
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130       Default Defined Ports:
131                 tcp 20048
132                 udp 20048
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MANAGED FILES

135       The SELinux process type mount_t can manage files labeled with the fol‐
136       lowing file types.  The paths listed are the default  paths  for  these
137       file types.  Note the processes UID still need to have DAC permissions.
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139       file_type
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141            all files on the system
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FILE CONTEXTS

145       SELinux requires files to have an extended attribute to define the file
146       type.
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148       You can see the context of a file using the -Z option to ls
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150       Policy governs the access  confined  processes  have  to  these  files.
151       SELinux  mount  policy  is  very flexible allowing users to setup their
152       mount processes in as secure a method as possible.
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154       STANDARD FILE CONTEXT
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156       SELinux defines the file context types for the mount, if you wanted  to
157       store  files with these types in a different paths, you need to execute
158       the semanage command to specify alternate labeling  and  then  use  re‐
159       storecon to put the labels on disk.
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161       semanage fcontext -a -t mount_exec_t '/srv/mount/content(/.*)?'
162       restorecon -R -v /srv/mymount_content
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164       Note:  SELinux  often  uses  regular expressions to specify labels that
165       match multiple files.
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167       The following file types are defined for mount:
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171       mount_ecryptfs_exec_t
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173       - Set files with the mount_ecryptfs_exec_t type, if you want to transi‐
174       tion an executable to the mount_ecryptfs_t domain.
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177       Paths:
178            /usr/sbin/mount.ecryptfs,               /usr/sbin/umount.ecryptfs,
179            /usr/sbin/mount.ecryptfs_private,   /usr/sbin/umount.ecryptfs_pri‐
180            vate
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183       mount_ecryptfs_tmpfs_t
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185       -  Set files with the mount_ecryptfs_tmpfs_t type, if you want to store
186       mount ecryptfs files on a tmpfs file system.
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190       mount_exec_t
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192       - Set files with the mount_exec_t type, if you want  to  transition  an
193       executable to the mount_t domain.
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196       Paths:
197            /bin/mount.*,    /bin/umount.*,   /sbin/mount.*,   /sbin/umount.*,
198            /usr/bin/mount.*,      /usr/bin/umount.*,       /usr/sbin/mount.*,
199            /usr/sbin/umount.*
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202       mount_loopback_t
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204       -  Set  files  with the mount_loopback_t type, if you want to treat the
205       files as mount loopback data.
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209       mount_tmp_t
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211       - Set files with the mount_tmp_t type, if you want to store mount  tem‐
212       porary files in the /tmp directories.
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216       mount_var_run_t
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218       -  Set  files  with  the mount_var_run_t type, if you want to store the
219       mount files under the /run or /var/run directory.
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222       Paths:
223            /run/mount(/.*)?,     /dev/.mount(/.*)?,     /var/run/mount(/.*)?,
224            /var/run/davfs2(/.*)?, /var/cache/davfs2(/.*)?
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227       Note:  File context can be temporarily modified with the chcon command.
228       If you want to permanently change the file context you need to use  the
229       semanage fcontext command.  This will modify the SELinux labeling data‐
230       base.  You will need to use restorecon to apply the labels.
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COMMANDS

234       semanage fcontext can also be used to manipulate default  file  context
235       mappings.
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237       semanage  permissive  can  also  be used to manipulate whether or not a
238       process type is permissive.
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240       semanage module can also be used to enable/disable/install/remove  pol‐
241       icy modules.
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243       semanage port can also be used to manipulate the port definitions
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245       semanage boolean can also be used to manipulate the booleans
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248       system-config-selinux is a GUI tool available to customize SELinux pol‐
249       icy settings.
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AUTHOR

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