1mount_selinux(8) SELinux Policy mount mount_selinux(8)
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6 mount_selinux - Security Enhanced Linux Policy for the mount processes
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9 Security-Enhanced Linux secures the mount processes via flexible manda‐
10 tory access control.
11 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.
15 For example:
17 ps -eZ | grep mount_t
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23 The mount_t SELinux type can be entered via the fusermount_exec_t,
24 mount_exec_t file types.
25 The default entrypoint paths for the mount_t domain are the following:
27 /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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33 SELinux defines process types (domains) for each process running on the
34 system
35 You can see the context of a process using the -Z option to ps
37 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.
41 The following process types are defined for mount:
43 mount_t, mount_ecryptfs_t
45 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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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.
56 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.
63 setsebool -P deny_execmem 1
65 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.
71 setsebool -P mmap_low_allowed 1
73 If you want to allow system to run with NIS, you must turn on the
77 nis_enabled boolean. Disabled by default.
78 setsebool -P nis_enabled 1
80 If you want to disable kernel module loading, you must turn on the se‐
84 cure_mode_insmod boolean. Disabled by default.
85 setsebool -P secure_mode_insmod 1
87 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.
95 setsebool -P selinuxuser_execheap 1
97 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.
105 setsebool -P selinuxuser_execstack 1
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111 SELinux defines port types to represent TCP and UDP ports.
112 You can see the types associated with a port by using the following
114 command:
115 semanage port -l
117 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.
122 The following port types are defined for mount:
124 mountd_port_t
127 Default Defined Ports:
131 tcp 20048
132 udp 20048
133
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.
138 file_type
140 all files on the system
142
145 SELinux requires files to have an extended attribute to define the file
146 type.
147 You can see the context of a file using the -Z option to ls
149 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.
153 STANDARD FILE CONTEXT
155 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.
160 semanage fcontext -a -t mount_exec_t '/srv/mount/content(/.*)?'
162 restorecon -R -v /srv/mymount_content
163 Note: SELinux often uses regular expressions to specify labels that
165 match multiple files.
166 The following file types are defined for mount:
168 mount_ecryptfs_exec_t
172 - Set files with the mount_ecryptfs_exec_t type, if you want to transi‐
174 tion an executable to the mount_ecryptfs_t domain.
175 Paths:
178 /usr/sbin/mount.ecryptfs, /usr/sbin/umount.ecryptfs,
179 /usr/sbin/mount.ecryptfs_private, /usr/sbin/umount.ecryptfs_pri‐
180 vate
181 mount_ecryptfs_tmpfs_t
184 - Set files with the mount_ecryptfs_tmpfs_t type, if you want to store
186 mount ecryptfs files on a tmpfs file system.
187 mount_exec_t
191 - Set files with the mount_exec_t type, if you want to transition an
193 executable to the mount_t domain.
194 Paths:
197 /bin/mount.*, /bin/umount.*, /sbin/mount.*, /sbin/umount.*,
198 /usr/bin/mount.*, /usr/bin/umount.*, /usr/sbin/mount.*,
199 /usr/sbin/umount.*
200 mount_loopback_t
203 - Set files with the mount_loopback_t type, if you want to treat the
205 files as mount loopback data.
206 mount_tmp_t
210 - Set files with the mount_tmp_t type, if you want to store mount tem‐
212 porary files in the /tmp directories.
213 mount_var_run_t
217 - 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.
220 Paths:
223 /run/mount(/.*)?, /dev/.mount(/.*)?, /var/run/mount(/.*)?,
224 /var/run/davfs2(/.*)?, /var/cache/davfs2(/.*)?
225 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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234 semanage fcontext can also be used to manipulate default file context
235 mappings.
236 semanage permissive can also be used to manipulate whether or not a
238 process type is permissive.
239 semanage module can also be used to enable/disable/install/remove pol‐
241 icy modules.
242 semanage port can also be used to manipulate the port definitions
244 semanage boolean can also be used to manipulate the booleans
246 system-config-selinux is a GUI tool available to customize SELinux pol‐
249 icy settings.
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253 This manual page was auto-generated using sepolicy manpage .
254
257 selinux(8), mount(8), semanage(8), restorecon(8), chcon(1), sepol‐
258 icy(8), setsebool(8), mount_ecryptfs_selinux(8),
259 mount_ecryptfs_selinux(8)
260mount 23-12-15 mount_selinux(8)