1mount_selinux(8) SELinux Policy mount mount_selinux(8)
2
6 mount_selinux - Security Enhanced Linux Policy for the mount processes
7
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
19
23 The mount_t SELinux type can be entered via the mount_exec_t, fuser‐
24 mount_exec_t file types.
25 The default entrypoint paths for the mount_t domain are the following:
27 /bin/mount.*, /bin/umount.*, /sbin/mount.*, /sbin/umount.*,
29 /usr/bin/mount.*, /usr/bin/umount.*, /usr/sbin/mount.*,
30 /usr/sbin/umount.*, /bin/fusermount[0-9]?, /usr/bin/fusermount[0-9]?
31
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.
50
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. Enabled 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 disable kernel module loading, you must turn on the se‐
77 cure_mode_insmod boolean. Enabled by default.
78 setsebool -P secure_mode_insmod 1
80 If you want to allow unconfined executables to make their heap memory
84 executable. Doing this is a really bad idea. Probably indicates a
85 badly coded executable, but could indicate an attack. This executable
86 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
87 echeap boolean. Disabled by default.
88 setsebool -P selinuxuser_execheap 1
90 If you want to allow unconfined executables to make their stack exe‐
94 cutable. This should never, ever be necessary. Probably indicates a
95 badly coded executable, but could indicate an attack. This executable
96 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
97 stack boolean. Enabled by default.
98 setsebool -P selinuxuser_execstack 1
100
104 SELinux defines port types to represent TCP and UDP ports.
105 You can see the types associated with a port by using the following
107 command:
108 semanage port -l
110 Policy governs the access confined processes have to these ports.
113 SELinux mount policy is very flexible allowing users to setup their
114 mount processes in as secure a method as possible.
115 The following port types are defined for mount:
117 mountd_port_t
120 Default Defined Ports:
124 tcp 20048
125 udp 20048
126
128 The SELinux process type mount_t can manage files labeled with the fol‐
129 lowing file types. The paths listed are the default paths for these
130 file types. Note the processes UID still need to have DAC permissions.
131 file_type
133 all files on the system
135
138 SELinux requires files to have an extended attribute to define the file
139 type.
140 You can see the context of a file using the -Z option to ls
142 Policy governs the access confined processes have to these files.
144 SELinux mount policy is very flexible allowing users to setup their
145 mount processes in as secure a method as possible.
146 STANDARD FILE CONTEXT
148 SELinux defines the file context types for the mount, if you wanted to
150 store files with these types in a diffent paths, you need to execute
151 the semanage command to sepecify alternate labeling and then use re‐
152 storecon to put the labels on disk.
153 semanage fcontext -a -t mount_ecryptfs_tmpfs_t '/srv/mymount_con‐
155 tent(/.*)?'
156 restorecon -R -v /srv/mymount_content
157 Note: SELinux often uses regular expressions to specify labels that
159 match multiple files.
160 The following file types are defined for mount:
162 mount_ecryptfs_exec_t
166 - Set files with the mount_ecryptfs_exec_t type, if you want to transi‐
168 tion an executable to the mount_ecryptfs_t domain.
169 Paths:
172 /usr/sbin/mount.ecryptfs, /usr/sbin/umount.ecryptfs,
173 /usr/sbin/mount.ecryptfs_private, /usr/sbin/umount.ecryptfs_pri‐
174 vate
175 mount_ecryptfs_tmpfs_t
178 - Set files with the mount_ecryptfs_tmpfs_t type, if you want to store
180 mount ecryptfs files on a tmpfs file system.
181 mount_exec_t
185 - Set files with the mount_exec_t type, if you want to transition an
187 executable to the mount_t domain.
188 Paths:
191 /bin/mount.*, /bin/umount.*, /sbin/mount.*, /sbin/umount.*,
192 /usr/bin/mount.*, /usr/bin/umount.*, /usr/sbin/mount.*,
193 /usr/sbin/umount.*
194 mount_loopback_t
197 - Set files with the mount_loopback_t type, if you want to treat the
199 files as mount loopback data.
200 mount_tmp_t
204 - Set files with the mount_tmp_t type, if you want to store mount tem‐
206 porary files in the /tmp directories.
207 mount_var_run_t
211 - Set files with the mount_var_run_t type, if you want to store the
213 mount files under the /run or /var/run directory.
214 Paths:
217 /run/mount(/.*)?, /dev/.mount(/.*)?, /var/run/mount(/.*)?,
218 /var/run/davfs2(/.*)?, /var/cache/davfs2(/.*)?
219 Note: File context can be temporarily modified with the chcon command.
222 If you want to permanently change the file context you need to use the
223 semanage fcontext command. This will modify the SELinux labeling data‐
224 base. You will need to use restorecon to apply the labels.
225
228 semanage fcontext can also be used to manipulate default file context
229 mappings.
230 semanage permissive can also be used to manipulate whether or not a
232 process type is permissive.
233 semanage module can also be used to enable/disable/install/remove pol‐
235 icy modules.
236 semanage port can also be used to manipulate the port definitions
238 semanage boolean can also be used to manipulate the booleans
240 system-config-selinux is a GUI tool available to customize SELinux pol‐
243 icy settings.
244
247 This manual page was auto-generated using sepolicy manpage .
248
251 selinux(8), mount(8), semanage(8), restorecon(8), chcon(1), sepol‐
252 icy(8), setsebool(8), mount_ecryptfs_selinux(8),
253 mount_ecryptfs_selinux(8)
254mount 21-06-09 mount_selinux(8)