prelink_selinux(8)

1prelink_selinux(8)          SELinux Policy prelink          prelink_selinux(8)
2
3
4

NAME

6       prelink_selinux  -  Security Enhanced Linux Policy for the prelink pro‐
7       cesses
8

DESCRIPTION

10       Security-Enhanced Linux secures  the  prelink  processes  via  flexible
11       mandatory access control.
12
13       The  prelink processes execute with the prelink_t SELinux type. You can
14       check if you have these processes running by executing the  ps  command
15       with the -Z qualifier.
16
17       For example:
18
19       ps -eZ | grep prelink_t
20
21
22

ENTRYPOINTS

24       The  prelink_t  SELinux type can be entered via the prelink_exec_t file
25       type.
26
27       The default entrypoint paths for the prelink_t domain are  the  follow‐
28       ing:
29
30       /usr/sbin/prelink(.bin)?
31

PROCESS TYPES

33       SELinux defines process types (domains) for each process running on the
34       system
35
36       You can see the context of a process using the -Z option to ps
37
38       Policy governs the access confined processes have  to  files.   SELinux
39       prelink  policy  is very flexible allowing users to setup their prelink
40       processes in as secure a method as possible.
41
42       The following process types are defined for prelink:
43
44       prelink_t, prelink_cron_system_t
45
46       Note: semanage permissive -a prelink_t can be used to make the  process
47       type  prelink_t  permissive. SELinux does not deny access to permissive
48       process types, but the AVC (SELinux denials) messages are still  gener‐
49       ated.
50
51

BOOLEANS

53       SELinux policy is customizable based on least access required.  prelink
54       policy is extremely flexible and has several booleans that allow you to
55       manipulate  the  policy and run prelink with the tightest access possi‐
56       ble.
57
58
59
60       If you want to deny user domains applications to map a memory region as
61       both  executable  and  writable,  this  is dangerous and the executable
62       should be reported in bugzilla, you must turn on the deny_execmem bool‐
63       ean. Enabled by default.
64
65       setsebool -P deny_execmem 1
66
67
68
69       If you want to allow all domains to execute in fips_mode, you must turn
70       on the fips_mode boolean. Enabled by default.
71
72       setsebool -P fips_mode 1
73
74
75
76       If you want to control the ability to mmap a low area  of  the  address
77       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
78       the mmap_low_allowed boolean. Disabled by default.
79
80       setsebool -P mmap_low_allowed 1
81
82
83
84       If you want to disable kernel module loading,  you  must  turn  on  the
85       secure_mode_insmod boolean. Enabled by default.
86
87       setsebool -P secure_mode_insmod 1
88
89
90
91       If  you  want to allow unconfined executables to make their heap memory
92       executable.  Doing this is a really  bad  idea.  Probably  indicates  a
93       badly  coded  executable, but could indicate an attack. This executable
94       should  be  reported  in  bugzilla,  you  must  turn  on   the   selin‐
95       uxuser_execheap boolean. Disabled by default.
96
97       setsebool -P selinuxuser_execheap 1
98
99
100
101       If  you  want  to allow unconfined executables to make their stack exe‐
102       cutable.  This should never, ever be necessary.  Probably  indicates  a
103       badly  coded  executable, but could indicate an attack. This executable
104       should be reported in bugzilla, you must turn on the  selinuxuser_exec‐
105       stack boolean. Enabled by default.
106
107       setsebool -P selinuxuser_execstack 1
108
109
110

MANAGED FILES

112       The  SELinux  process  type prelink_t can manage files labeled with the
113       following file types.  The paths listed are the default paths for these
114       file types.  Note the processes UID still need to have DAC permissions.
115
116       file_type
117
118            all files on the system
119
120

FILE CONTEXTS

122       SELinux requires files to have an extended attribute to define the file
123       type.
124
125       You can see the context of a file using the -Z option to ls
126
127       Policy governs the access  confined  processes  have  to  these  files.
128       SELinux  prelink  policy is very flexible allowing users to setup their
129       prelink processes in as secure a method as possible.
130
131       EQUIVALENCE DIRECTORIES
132
133
134       prelink policy stores data with multiple different file  context  types
135       under  the  /var/log/prelink directory.  If you would like to store the
136       data in a different directory you can use the semanage command to  cre‐
137       ate an equivalence mapping.  If you wanted to store this data under the
138       /srv dirctory you would execute the following command:
139
140       semanage fcontext -a -e /var/log/prelink /srv/prelink
141       restorecon -R -v /srv/prelink
142
143       STANDARD FILE CONTEXT
144
145       SELinux defines the file context types for the prelink, if  you  wanted
146       to store files with these types in a diffent paths, you need to execute
147       the semanage command  to  sepecify  alternate  labeling  and  then  use
148       restorecon to put the labels on disk.
149
150       semanage   fcontext   -a   -t   prelink_var_lib_t  '/srv/myprelink_con‐
151       tent(/.*)?'
152       restorecon -R -v /srv/myprelink_content
153
154       Note: SELinux often uses regular expressions  to  specify  labels  that
155       match multiple files.
156
157       The following file types are defined for prelink:
158
159
160
161       prelink_cache_t
162
163       -  Set  files  with  the prelink_cache_t type, if you want to store the
164       files under the /var/cache directory.
165
166
167
168       prelink_cron_system_exec_t
169
170       - Set files with the prelink_cron_system_exec_t type, if  you  want  to
171       transition an executable to the prelink_cron_system_t domain.
172
173
174
175       prelink_exec_t
176
177       -  Set files with the prelink_exec_t type, if you want to transition an
178       executable to the prelink_t domain.
179
180
181
182       prelink_log_t
183
184       - Set files with the prelink_log_t type, if you want to treat the  data
185       as prelink log data, usually stored under the /var/log directory.
186
187
188       Paths:
189            /var/log/prelink(/.*)?, /var/log/prelink.log.*
190
191
192       prelink_tmp_t
193
194       -  Set  files with the prelink_tmp_t type, if you want to store prelink
195       temporary files in the /tmp directories.
196
197
198
199       prelink_tmpfs_t
200
201       - Set files with the prelink_tmpfs_t type, if you want to store prelink
202       files on a tmpfs file system.
203
204
205
206       prelink_var_lib_t
207
208       -  Set  files with the prelink_var_lib_t type, if you want to store the
209       prelink files under the /var/lib directory.
210
211
212       Paths:
213            /var/lib/prelink(/.*)?, /var/lib/misc/prelink.*
214
215
216       Note: File context can be temporarily modified with the chcon  command.
217       If  you want to permanently change the file context you need to use the
218       semanage fcontext command.  This will modify the SELinux labeling data‐
219       base.  You will need to use restorecon to apply the labels.
220
221

COMMANDS

223       semanage  fcontext  can also be used to manipulate default file context
224       mappings.
225
226       semanage permissive can also be used to manipulate  whether  or  not  a
227       process type is permissive.
228
229       semanage  module can also be used to enable/disable/install/remove pol‐
230       icy modules.
231
232       semanage boolean can also be used to manipulate the booleans
233
234
235       system-config-selinux is a GUI tool available to customize SELinux pol‐
236       icy settings.
237
238

AUTHOR

240       This manual page was auto-generated using sepolicy manpage .
241
242