1bootloader_selinux(8)      SELinux Policy bootloader     bootloader_selinux(8)
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NAME

6       bootloader_selinux  - Security Enhanced Linux Policy for the bootloader
7       processes
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DESCRIPTION

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

24       The  bootloader_t SELinux type can be entered via the bootloader_exec_t
25       file type.
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27       The default entrypoint paths for the bootloader_t domain are  the  fol‐
28       lowing:
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30       /sbin/grub.*,     /sbin/lilo.*,     /sbin/ybin.*,     /usr/sbin/grub.*,
31       /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
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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       bootloader policy is very flexible allowing users to setup their  boot‐
41       loader processes in as secure a method as possible.
42
43       The following process types are defined for bootloader:
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45       bootloader_t
46
47       Note:  semanage  permissive  -a  bootloader_t  can  be used to make the
48       process type bootloader_t permissive. SELinux does not deny  access  to
49       permissive  process  types,  but the AVC (SELinux denials) messages are
50       still generated.
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52

BOOLEANS

54       SELinux policy is customizable based on least access  required.   boot‐
55       loader policy is extremely flexible and has several booleans that allow
56       you to manipulate the policy and run bootloader with the  tightest  ac‐
57       cess possible.
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61       If  you  want  to control the ability to mmap a low area of the address
62       space, as configured by /proc/sys/vm/mmap_min_addr, you  must  turn  on
63       the mmap_low_allowed boolean. Disabled by default.
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65       setsebool -P mmap_low_allowed 1
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69       If  you want to disable kernel module loading, you must turn on the se‐
70       cure_mode_insmod boolean. Enabled by default.
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72       setsebool -P secure_mode_insmod 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 selinuxuser_ex‐
80       echeap boolean. Disabled by default.
81
82       setsebool -P selinuxuser_execheap 1
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85
86       If you want to allow unconfined executables to make  their  stack  exe‐
87       cutable.   This  should  never, ever be necessary. Probably indicates a
88       badly coded executable, but could indicate an attack.  This  executable
89       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
90       stack boolean. Enabled by default.
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92       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

97       The SELinux process type bootloader_t can manage files labeled with the
98       following file types.  The paths listed are the default paths for these
99       file types.  Note the processes UID still need to have DAC permissions.
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101       file_type
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103            all files on the system
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105

FILE CONTEXTS

107       SELinux requires files to have an extended attribute to define the file
108       type.
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110       You can see the context of a file using the -Z option to ls
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112       Policy  governs  the  access  confined  processes  have to these files.
113       SELinux bootloader policy is very  flexible  allowing  users  to  setup
114       their bootloader processes in as secure a method as possible.
115
116       STANDARD FILE CONTEXT
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118       SELinux  defines  the  file  context  types  for the bootloader, if you
119       wanted to store files with these types in a diffent paths, you need  to
120       execute the semanage command to specify alternate labeling and then use
121       restorecon to put the labels on disk.
122
123       semanage  fcontext  -a  -t   bootloader_tmp_t   '/srv/mybootloader_con‐
124       tent(/.*)?'
125       restorecon -R -v /srv/mybootloader_content
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127       Note:  SELinux  often  uses  regular expressions to specify labels that
128       match multiple files.
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130       The following file types are defined for bootloader:
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134       bootloader_etc_t
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136       - Set files with the bootloader_etc_t type, if you want to store  boot‐
137       loader files in the /etc directories.
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139
140       Paths:
141            /etc/lilo.conf.*,  /etc/zipl.conf.*,  /etc/yaboot.conf.*, /etc/de‐
142            fault/grub
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145       bootloader_exec_t
146
147       - Set files with the bootloader_exec_t type, if you want to  transition
148       an executable to the bootloader_t domain.
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150
151       Paths:
152            /sbin/grub.*,    /sbin/lilo.*,   /sbin/ybin.*,   /usr/sbin/grub.*,
153            /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
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156       bootloader_tmp_t
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158       - Set files with the bootloader_tmp_t type, if you want to store  boot‐
159       loader temporary files in the /tmp directories.
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163       bootloader_var_lib_t
164
165       -  Set  files  with the bootloader_var_lib_t type, if you want to store
166       the bootloader files under the /var/lib directory.
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170       bootloader_var_run_t
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172       - Set files with the bootloader_var_run_t type, if you  want  to  store
173       the bootloader files under the /run or /var/run directory.
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177       Note:  File context can be temporarily modified with the chcon command.
178       If you want to permanently change the file context you need to use  the
179       semanage fcontext command.  This will modify the SELinux labeling data‐
180       base.  You will need to use restorecon to apply the labels.
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COMMANDS

184       semanage fcontext can also be used to manipulate default  file  context
185       mappings.
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187       semanage  permissive  can  also  be used to manipulate whether or not a
188       process type is permissive.
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190       semanage module can also be used to enable/disable/install/remove  pol‐
191       icy modules.
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193       semanage boolean can also be used to manipulate the booleans
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195
196       system-config-selinux is a GUI tool available to customize SELinux pol‐
197       icy settings.
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AUTHOR

201       This manual page was auto-generated using sepolicy manpage .
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SEE ALSO

205       selinux(8), bootloader(8), semanage(8), restorecon(8), chcon(1), sepol‐
206       icy(8), setsebool(8)
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210bootloader                         22-05-27              bootloader_selinux(8)
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