1xdm_unconfined_selinux(8)SELinux Policy xdm_unconfinedxdm_unconfined_selinux(8)
2
6 xdm_unconfined_selinux - Security Enhanced Linux Policy for the xdm_un‐
7 confined processes
8
10 Security-Enhanced Linux secures the xdm_unconfined processes via flexi‐
11 ble mandatory access control.
12 The xdm_unconfined processes execute with the xdm_unconfined_t SELinux
14 type. You can check if you have these processes running by executing
15 the ps command with the -Z qualifier.
16 For example:
18 ps -eZ | grep xdm_unconfined_t
20
24 The xdm_unconfined_t SELinux type can be entered via the xdm_uncon‐
25 fined_exec_t file type.
26 The default entrypoint paths for the xdm_unconfined_t domain are the
28 following:
29 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?, /etc/[mg]dm/Pre‐
31 Session(/.*)?, /etc/[mg]dm/PostSession(/.*)?
32
34 SELinux defines process types (domains) for each process running on the
35 system
36 You can see the context of a process using the -Z option to ps
38 Policy governs the access confined processes have to files. SELinux
40 xdm_unconfined policy is very flexible allowing users to setup their
41 xdm_unconfined processes in as secure a method as possible.
42 The following process types are defined for xdm_unconfined:
44 xdm_unconfined_t
46 Note: semanage permissive -a xdm_unconfined_t can be used to make the
48 process type xdm_unconfined_t permissive. SELinux does not deny access
49 to permissive process types, but the AVC (SELinux denials) messages are
50 still generated.
51
54 SELinux policy is customizable based on least access required. xdm_un‐
55 confined policy is extremely flexible and has several booleans that al‐
56 low you to manipulate the policy and run xdm_unconfined with the tight‐
57 est access possible.
58 If you want to deny user domains applications to map a memory region as
62 both executable and writable, this is dangerous and the executable
63 should be reported in bugzilla, you must turn on the deny_execmem bool‐
64 ean. Disabled by default.
65 setsebool -P deny_execmem 1
67 If you want to control the ability to mmap a low area of the address
71 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
72 the mmap_low_allowed boolean. Disabled by default.
73 setsebool -P mmap_low_allowed 1
75 If you want to disable kernel module loading, you must turn on the se‐
79 cure_mode_insmod boolean. Disabled by default.
80 setsebool -P secure_mode_insmod 1
82 If you want to allow unconfined executables to make their heap memory
86 executable. Doing this is a really bad idea. Probably indicates a
87 badly coded executable, but could indicate an attack. This executable
88 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
89 echeap boolean. Disabled by default.
90 setsebool -P selinuxuser_execheap 1
92 If you want to allow unconfined executables to make their stack exe‐
96 cutable. This should never, ever be necessary. Probably indicates a
97 badly coded executable, but could indicate an attack. This executable
98 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
99 stack boolean. Enabled by default.
100 setsebool -P selinuxuser_execstack 1
102
106 The SELinux process type xdm_unconfined_t can manage files labeled with
107 the following file types. The paths listed are the default paths for
108 these file types. Note the processes UID still need to have DAC per‐
109 missions.
110 file_type
112 all files on the system
114
117 SELinux requires files to have an extended attribute to define the file
118 type.
119 You can see the context of a file using the -Z option to ls
121 Policy governs the access confined processes have to these files.
123 SELinux xdm_unconfined policy is very flexible allowing users to setup
124 their xdm_unconfined processes in as secure a method as possible.
125 STANDARD FILE CONTEXT
127 SELinux defines the file context types for the xdm_unconfined, if you
129 wanted to store files with these types in a different paths, you need
130 to execute the semanage command to specify alternate labeling and then
131 use restorecon to put the labels on disk.
132 semanage fcontext -a -t xdm_unconfined_exec_t '/srv/xdm_unconfined/con‐
134 tent(/.*)?'
135 restorecon -R -v /srv/myxdm_unconfined_content
136 Note: SELinux often uses regular expressions to specify labels that
138 match multiple files.
139 The following file types are defined for xdm_unconfined:
141 xdm_unconfined_exec_t
145 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
147 tion an executable to the xdm_unconfined_t domain.
148 Paths:
151 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
152 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
153 Note: File context can be temporarily modified with the chcon command.
156 If you want to permanently change the file context you need to use the
157 semanage fcontext command. This will modify the SELinux labeling data‐
158 base. You will need to use restorecon to apply the labels.
159
162 semanage fcontext can also be used to manipulate default file context
163 mappings.
164 semanage permissive can also be used to manipulate whether or not a
166 process type is permissive.
167 semanage module can also be used to enable/disable/install/remove pol‐
169 icy modules.
170 semanage boolean can also be used to manipulate the booleans
172 system-config-selinux is a GUI tool available to customize SELinux pol‐
175 icy settings.
176
179 This manual page was auto-generated using sepolicy manpage .
180
183 selinux(8), xdm_unconfined(8), semanage(8), restorecon(8), chcon(1),
184 sepolicy(8), setsebool(8)
185xdm_unconfined 23-10-20 xdm_unconfined_selinux(8)