1livecd_selinux(8) SELinux Policy livecd livecd_selinux(8)
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6 livecd_selinux - Security Enhanced Linux Policy for the livecd pro‐
7 cesses
8
10 Security-Enhanced Linux secures the livecd processes via flexible
11 mandatory access control.
12 The livecd processes execute with the livecd_t SELinux type. You can
14 check if you have these processes running by executing the ps command
15 with the -Z qualifier.
16 For example:
18 ps -eZ | grep livecd_t
20
24 The livecd_t SELinux type can be entered via the livecd_exec_t file
25 type.
26 The default entrypoint paths for the livecd_t domain are the following:
28 /usr/bin/livecd-creator
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32 SELinux defines process types (domains) for each process running on the
33 system
34 You can see the context of a process using the -Z option to ps
36 Policy governs the access confined processes have to files. SELinux
38 livecd policy is very flexible allowing users to setup their livecd
39 processes in as secure a method as possible.
40 The following process types are defined for livecd:
42 livecd_t
44 Note: semanage permissive -a livecd_t can be used to make the process
46 type livecd_t permissive. SELinux does not deny access to permissive
47 process types, but the AVC (SELinux denials) messages are still gener‐
48 ated.
49
52 SELinux policy is customizable based on least access required. livecd
53 policy is extremely flexible and has several booleans that allow you to
54 manipulate the policy and run livecd with the tightest access possible.
55 If you want to deny user domains applications to map a memory region as
59 both executable and writable, this is dangerous and the executable
60 should be reported in bugzilla, you must turn on the deny_execmem bool‐
61 ean. Enabled by default.
62 setsebool -P deny_execmem 1
64 If you want to deny any process from ptracing or debugging any other
68 processes, you must turn on the deny_ptrace boolean. Enabled by
69 default.
70 setsebool -P deny_ptrace 1
72 If you want to allow all domains to execute in fips_mode, you must turn
76 on the fips_mode boolean. Enabled by default.
77 setsebool -P fips_mode 1
79 If you want to control the ability to mmap a low area of the address
83 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
84 the mmap_low_allowed boolean. Disabled by default.
85 setsebool -P mmap_low_allowed 1
87 If you want to disable kernel module loading, you must turn on the
91 secure_mode_insmod boolean. Enabled by default.
92 setsebool -P secure_mode_insmod 1
94 If you want to allow unconfined executables to make their heap memory
98 executable. Doing this is a really bad idea. Probably indicates a
99 badly coded executable, but could indicate an attack. This executable
100 should be reported in bugzilla, you must turn on the selin‐
101 uxuser_execheap boolean. Disabled by default.
102 setsebool -P selinuxuser_execheap 1
104 If you want to allow unconfined executables to make their stack exe‐
108 cutable. This should never, ever be necessary. Probably indicates a
109 badly coded executable, but could indicate an attack. This executable
110 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
111 stack boolean. Enabled by default.
112 setsebool -P selinuxuser_execstack 1
114
118 The SELinux process type livecd_t can manage files labeled with the
119 following file types. The paths listed are the default paths for these
120 file types. Note the processes UID still need to have DAC permissions.
121 file_type
123 all files on the system
125
128 SELinux requires files to have an extended attribute to define the file
129 type.
130 You can see the context of a file using the -Z option to ls
132 Policy governs the access confined processes have to these files.
134 SELinux livecd policy is very flexible allowing users to setup their
135 livecd processes in as secure a method as possible.
136 STANDARD FILE CONTEXT
138 SELinux defines the file context types for the livecd, if you wanted to
140 store files with these types in a diffent paths, you need to execute
141 the semanage command to sepecify alternate labeling and then use
142 restorecon to put the labels on disk.
143 semanage fcontext -a -t livecd_tmp_t '/srv/mylivecd_content(/.*)?'
145 restorecon -R -v /srv/mylivecd_content
146 Note: SELinux often uses regular expressions to specify labels that
148 match multiple files.
149 The following file types are defined for livecd:
151 livecd_exec_t
155 - Set files with the livecd_exec_t type, if you want to transition an
157 executable to the livecd_t domain.
158 livecd_tmp_t
162 - Set files with the livecd_tmp_t type, if you want to store livecd
164 temporary files in the /tmp directories.
165 Note: File context can be temporarily modified with the chcon command.
169 If you want to permanently change the file context you need to use the
170 semanage fcontext command. This will modify the SELinux labeling data‐
171 base. You will need to use restorecon to apply the labels.
172
175 semanage fcontext can also be used to manipulate default file context
176 mappings.
177 semanage permissive can also be used to manipulate whether or not a
179 process type is permissive.
180 semanage module can also be used to enable/disable/install/remove pol‐
182 icy modules.
183 semanage boolean can also be used to manipulate the booleans
185 system-config-selinux is a GUI tool available to customize SELinux pol‐
188 icy settings.
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192 This manual page was auto-generated using sepolicy manpage .
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196 selinux(8), livecd(8), semanage(8), restorecon(8), chcon(1), sepol‐
197 icy(8), setsebool(8)
198livecd 19-10-08 livecd_selinux(8)