prelink_selinux(8)

1prelink_selinux(8)          SELinux Policy prelink          prelink_selinux(8)
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NAME

6       prelink_selinux  -  Security Enhanced Linux Policy for the prelink pro‐
7       cesses
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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.
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17       For example:
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19       ps -eZ | grep prelink_t
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ENTRYPOINTS

24       The  prelink_t  SELinux  type  can  be  entered via the file_type, pre‐
25       link_exec_t, unlabeled_t,  proc_type,  filesystem_type,  mtrr_device_t,
26       sysctl_type file types.
27
28       The  default  entrypoint paths for the prelink_t domain are the follow‐
29       ing:
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31       all files on the system, /usr/sbin/prelink(.bin)?, /dev/cpu/mtrr
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PROCESS TYPES

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

54       SELinux policy is customizable based on least access required.  prelink
55       policy is extremely flexible and has several booleans that allow you to
56       manipulate the policy and run prelink with the tightest  access  possi‐
57       ble.
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61       If  you  want to allow all daemons the ability to read/write terminals,
62       you  must  turn  on  the  allow_daemons_use_tty  boolean.  Disabled  by
63       default.
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65       setsebool -P allow_daemons_use_tty 1
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69       If you want to allow all domains to use other domains file descriptors,
70       you must turn on the allow_domain_fd_use boolean. Enabled by default.
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72       setsebool -P allow_domain_fd_use 1
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76       If you want to allow unconfined executables to make their  heap  memory
77       executable.   Doing  this  is  a  really bad idea. Probably indicates a
78       badly coded executable, but could indicate an attack.  This  executable
79       should  be  reported  in  bugzilla, you must turn on the allow_execheap
80       boolean. Disabled by default.
81
82       setsebool -P allow_execheap 1
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86       If you want to allow unconfined executables to map a memory  region  as
87       both  executable  and  writable,  this  is dangerous and the executable
88       should be reported in bugzilla), you must  turn  on  the  allow_execmem
89       boolean. Enabled by default.
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91       setsebool -P allow_execmem 1
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95       If  you  want  to  allow  all  unconfined  executables to use libraries
96       requiring text relocation that are not  labeled  textrel_shlib_t),  you
97       must turn on the allow_execmod boolean. Enabled by default.
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99       setsebool -P allow_execmod 1
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103       If  you  want  to allow unconfined executables to make their stack exe‐
104       cutable.  This should never, ever be necessary.  Probably  indicates  a
105       badly  coded  executable, but could indicate an attack. This executable
106       should be reported in bugzilla), you must turn on  the  allow_execstack
107       boolean. Enabled by default.
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109       setsebool -P allow_execstack 1
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113       If  you want to allow sysadm to debug or ptrace all processes, you must
114       turn on the allow_ptrace boolean. Disabled by default.
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116       setsebool -P allow_ptrace 1
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120       If you want to allow all domains to have the kernel load  modules,  you
121       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
122       default.
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124       setsebool -P domain_kernel_load_modules 1
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128       If you want to allow all domains to execute in fips_mode, you must turn
129       on the fips_mode boolean. Enabled by default.
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131       setsebool -P fips_mode 1
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135       If you want to enable reading of urandom for all domains, you must turn
136       on the global_ssp boolean. Disabled by default.
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138       setsebool -P global_ssp 1
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142       If you want to allow certain domains to map low memory in  the  kernel,
143       you must turn on the mmap_low_allowed boolean. Disabled by default.
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145       setsebool -P mmap_low_allowed 1
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148
149       If  you want to boolean to determine whether the system permits loading
150       policy, setting enforcing mode, and changing boolean values.  Set  this
151       to  true  and  you  have to reboot to set it back, you must turn on the
152       secure_mode_policyload boolean. Disabled by default.
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154       setsebool -P secure_mode_policyload 1
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158       If you want to support X userspace object manager, you must turn on the
159       xserver_object_manager boolean. Disabled by default.
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161       setsebool -P xserver_object_manager 1
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MANAGED FILES

166       The  SELinux  process  type prelink_t can manage files labeled with the
167       following file types.  The paths listed are the default paths for these
168       file types.  Note the processes UID still need to have DAC permissions.
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170       file_type
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172            all files on the system
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174

FILE CONTEXTS

176       SELinux requires files to have an extended attribute to define the file
177       type.
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179       You can see the context of a file using the -Z option to ls
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181       Policy governs the access  confined  processes  have  to  these  files.
182       SELinux  prelink  policy is very flexible allowing users to setup their
183       prelink processes in as secure a method as possible.
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185       EQUIVALENCE DIRECTORIES
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188       prelink policy stores data with multiple different file  context  types
189       under  the  /var/log/prelink directory.  If you would like to store the
190       data in a different directory you can use the semanage command to  cre‐
191       ate an equivalence mapping.  If you wanted to store this data under the
192       /srv dirctory you would execute the following command:
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194       semanage fcontext -a -e /var/log/prelink /srv/prelink
195       restorecon -R -v /srv/prelink
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197       STANDARD FILE CONTEXT
198
199       SELinux defines the file context types for the prelink, if  you  wanted
200       to store files with these types in a diffent paths, you need to execute
201       the semanage command  to  sepecify  alternate  labeling  and  then  use
202       restorecon to put the labels on disk.
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204       semanage   fcontext   -a   -t   prelink_var_lib_t  '/srv/myprelink_con‐
205       tent(/.*)?'
206       restorecon -R -v /srv/myprelink_content
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208       Note: SELinux often uses regular expressions  to  specify  labels  that
209       match multiple files.
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211       The following file types are defined for prelink:
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215       prelink_cache_t
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217       -  Set  files  with  the prelink_cache_t type, if you want to store the
218       files under the /var/cache directory.
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222       prelink_cron_system_exec_t
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224       - Set files with the prelink_cron_system_exec_t type, if  you  want  to
225       transition an executable to the prelink_cron_system_t domain.
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229       prelink_exec_t
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231       -  Set files with the prelink_exec_t type, if you want to transition an
232       executable to the prelink_t domain.
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236       prelink_log_t
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238       - Set files with the prelink_log_t type, if you want to treat the  data
239       as prelink log data, usually stored under the /var/log directory.
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242       Paths:
243            /var/log/prelink(/.*)?, /var/log/prelink.log.*
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246       prelink_tmp_t
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248       -  Set  files with the prelink_tmp_t type, if you want to store prelink
249       temporary files in the /tmp directories.
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253       prelink_tmpfs_t
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255       - Set files with the prelink_tmpfs_t type, if you want to store prelink
256       files on a tmpfs file system.
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260       prelink_var_lib_t
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262       -  Set  files with the prelink_var_lib_t type, if you want to store the
263       prelink files under the /var/lib directory.
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265
266       Paths:
267            /var/lib/prelink(/.*)?, /var/lib/misc/prelink.*
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269
270       Note: File context can be temporarily modified with the chcon  command.
271       If  you want to permanently change the file context you need to use the
272       semanage fcontext command.  This will modify the SELinux labeling data‐
273       base.  You will need to use restorecon to apply the labels.
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COMMANDS

277       semanage  fcontext  can also be used to manipulate default file context
278       mappings.
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280       semanage permissive can also be used to manipulate  whether  or  not  a
281       process type is permissive.
282
283       semanage  module can also be used to enable/disable/install/remove pol‐
284       icy modules.
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286       semanage boolean can also be used to manipulate the booleans
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288
289       system-config-selinux is a GUI tool available to customize SELinux pol‐
290       icy settings.
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AUTHOR

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