bootloader_selinux(8)

1bootloader_selinux(8)      SELinux Policy bootloader     bootloader_selinux(8)
2
3
4

NAME

6       bootloader_selinux  - Security Enhanced Linux Policy for the bootloader
7       processes
8

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.
16
17       For example:
18
19       ps -eZ | grep bootloader_t
20
21
22

ENTRYPOINTS

24       The  bootloader_t SELinux type can be entered via the bootloader_exec_t
25       file type.
26
27       The default entrypoint paths for the bootloader_t domain are  the  fol‐
28       lowing:
29
30       /sbin/grub.*,     /sbin/lilo.*,     /sbin/ybin.*,     /usr/sbin/grub.*,
31       /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
32

PROCESS TYPES

34       SELinux defines process types (domains) for each process running on the
35       system
36
37       You can see the context of a process using the -Z option to ps
38
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:
44
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.
51
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.
58
59
60
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.
64
65       setsebool -P mmap_low_allowed 1
66
67
68
69       If  you  want  to  allow  system  to run with NIS, you must turn on the
70       nis_enabled boolean. Disabled by default.
71
72       setsebool -P nis_enabled 1
73
74
75
76       If you want to disable kernel module loading, you must turn on the  se‐
77       cure_mode_insmod boolean. Disabled by default.
78
79       setsebool -P secure_mode_insmod 1
80
81
82
83       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
89       setsebool -P selinuxuser_execheap 1
90
91
92
93       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
99       setsebool -P selinuxuser_execstack 1
100
101
102

MANAGED FILES

104       The SELinux process type bootloader_t can manage files labeled with the
105       following file types.  The paths listed are the default paths for these
106       file types.  Note the processes UID still need to have DAC permissions.
107
108       file_type
109
110            all files on the system
111
112

FILE CONTEXTS

114       SELinux requires files to have an extended attribute to define the file
115       type.
116
117       You can see the context of a file using the -Z option to ls
118
119       Policy governs the access  confined  processes  have  to  these  files.
120       SELinux  bootloader  policy  is  very  flexible allowing users to setup
121       their bootloader processes in as secure a method as possible.
122
123       STANDARD FILE CONTEXT
124
125       SELinux defines the file context  types  for  the  bootloader,  if  you
126       wanted  to  store files with these types in a different paths, you need
127       to execute the semanage command to specify alternate labeling and  then
128       use restorecon to put the labels on disk.
129
130       semanage   fcontext   -a   -t  bootloader_exec_t  '/srv/bootloader/con‐
131       tent(/.*)?'
132       restorecon -R -v /srv/mybootloader_content
133
134       Note: SELinux often uses regular expressions  to  specify  labels  that
135       match multiple files.
136
137       The following file types are defined for bootloader:
138
139
140
141       bootloader_etc_t
142
143       -  Set files with the bootloader_etc_t type, if you want to store boot‐
144       loader files in the /etc directories.
145
146
147       Paths:
148            /etc/lilo.conf.*, /etc/zipl.conf.*,  /etc/yaboot.conf.*,  /etc/de‐
149            fault/grub
150
151
152       bootloader_exec_t
153
154       -  Set files with the bootloader_exec_t type, if you want to transition
155       an executable to the bootloader_t domain.
156
157
158       Paths:
159            /sbin/grub.*,   /sbin/lilo.*,   /sbin/ybin.*,    /usr/sbin/grub.*,
160            /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
161
162
163       bootloader_tmp_t
164
165       -  Set files with the bootloader_tmp_t type, if you want to store boot‐
166       loader temporary files in the /tmp directories.
167
168
169
170       bootloader_var_lib_t
171
172       - Set files with the bootloader_var_lib_t type, if you  want  to  store
173       the bootloader files under the /var/lib directory.
174
175
176
177       bootloader_var_run_t
178
179       -  Set  files  with the bootloader_var_run_t type, if you want to store
180       the bootloader files under the /run or /var/run directory.
181
182
183
184       Note: File context can be temporarily modified with the chcon  command.
185       If  you want to permanently change the file context you need to use the
186       semanage fcontext command.  This will modify the SELinux labeling data‐
187       base.  You will need to use restorecon to apply the labels.
188
189

COMMANDS

191       semanage  fcontext  can also be used to manipulate default file context
192       mappings.
193
194       semanage permissive can also be used to manipulate  whether  or  not  a
195       process type is permissive.
196
197       semanage  module can also be used to enable/disable/install/remove pol‐
198       icy modules.
199
200       semanage boolean can also be used to manipulate the booleans
201
202
203       system-config-selinux is a GUI tool available to customize SELinux pol‐
204       icy settings.
205
206

AUTHOR

208       This manual page was auto-generated using sepolicy manpage .
209
210