1preupgrade_selinux(8) SELinux Policy preupgrade preupgrade_selinux(8)
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6 preupgrade_selinux - Security Enhanced Linux Policy for the preupgrade
7 processes
8
10 Security-Enhanced Linux secures the preupgrade processes via flexible
11 mandatory access control.
12 The preupgrade processes execute with the preupgrade_t SELinux type.
14 You can check if you have these processes running by executing the ps
15 command with the -Z qualifier.
16 For example:
18 ps -eZ | grep preupgrade_t
20
24 The preupgrade_t SELinux type can be entered via the preupgrade_exec_t
25 file type.
26 The default entrypoint paths for the preupgrade_t domain are the fol‐
28 lowing:
29 /usr/bin/preupg.*
31
33 SELinux defines process types (domains) for each process running on the
34 system
35 You can see the context of a process using the -Z option to ps
37 Policy governs the access confined processes have to files. SELinux
39 preupgrade policy is very flexible allowing users to setup their preup‐
40 grade processes in as secure a method as possible.
41 The following process types are defined for preupgrade:
43 preupgrade_t
45 Note: semanage permissive -a preupgrade_t can be used to make the
47 process type preupgrade_t permissive. SELinux does not deny access to
48 permissive process types, but the AVC (SELinux denials) messages are
49 still generated.
50
53 SELinux policy is customizable based on least access required. preup‐
54 grade policy is extremely flexible and has several booleans that allow
55 you to manipulate the policy and run preupgrade with the tightest
56 access possible.
57 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 setsebool -P deny_execmem 1
66 If you want to control the ability to mmap a low area of the address
70 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
71 the mmap_low_allowed boolean. Disabled by default.
72 setsebool -P mmap_low_allowed 1
74 If you want to disable kernel module loading, you must turn on the
78 secure_mode_insmod boolean. Enabled by default.
79 setsebool -P secure_mode_insmod 1
81 If you want to allow unconfined executables to make their heap memory
85 executable. Doing this is a really bad idea. Probably indicates a
86 badly coded executable, but could indicate an attack. This executable
87 should be reported in bugzilla, you must turn on the selin‐
88 uxuser_execheap boolean. Disabled by default.
89 setsebool -P selinuxuser_execheap 1
91 If you want to allow unconfined executables to make their stack exe‐
95 cutable. This should never, ever be necessary. Probably indicates a
96 badly coded executable, but could indicate an attack. This executable
97 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
98 stack boolean. Disabled by default.
99 setsebool -P selinuxuser_execstack 1
101
105 SELinux defines port types to represent TCP and UDP ports.
106 You can see the types associated with a port by using the following
108 command:
109 semanage port -l
111 Policy governs the access confined processes have to these ports.
114 SELinux preupgrade policy is very flexible allowing users to setup
115 their preupgrade processes in as secure a method as possible.
116 The following port types are defined for preupgrade:
118 preupgrade_port_t
121 Default Defined Ports:
125 tcp 8099
126
128 The SELinux process type preupgrade_t can manage files labeled with the
129 following file types. The paths listed are the default paths for these
130 file types. Note the processes UID still need to have DAC permissions.
131 file_type
133 all files on the system
135
138 SELinux requires files to have an extended attribute to define the file
139 type.
140 You can see the context of a file using the -Z option to ls
142 Policy governs the access confined processes have to these files.
144 SELinux preupgrade policy is very flexible allowing users to setup
145 their preupgrade processes in as secure a method as possible.
146 STANDARD FILE CONTEXT
148 SELinux defines the file context types for the preupgrade, if you
150 wanted to store files with these types in a diffent paths, you need to
151 execute the semanage command to sepecify alternate labeling and then
152 use restorecon to put the labels on disk.
153 semanage fcontext -a -t preupgrade_data_t '/srv/mypreupgrade_con‐
155 tent(/.*)?'
156 restorecon -R -v /srv/mypreupgrade_content
157 Note: SELinux often uses regular expressions to specify labels that
159 match multiple files.
160 The following file types are defined for preupgrade:
162 preupgrade_data_t
166 - Set files with the preupgrade_data_t type, if you want to treat the
168 files as preupgrade content.
169 Paths:
172 /var/lib/preupgrade(/.*)?, /var/log/preupgrade(/.*)?
173 preupgrade_exec_t
176 - Set files with the preupgrade_exec_t type, if you want to transition
178 an executable to the preupgrade_t domain.
179 Note: File context can be temporarily modified with the chcon command.
183 If you want to permanently change the file context you need to use the
184 semanage fcontext command. This will modify the SELinux labeling data‐
185 base. You will need to use restorecon to apply the labels.
186
189 semanage fcontext can also be used to manipulate default file context
190 mappings.
191 semanage permissive can also be used to manipulate whether or not a
193 process type is permissive.
194 semanage module can also be used to enable/disable/install/remove pol‐
196 icy modules.
197 semanage port can also be used to manipulate the port definitions
199 semanage boolean can also be used to manipulate the booleans
201 system-config-selinux is a GUI tool available to customize SELinux pol‐
204 icy settings.
205
208 This manual page was auto-generated using sepolicy manpage .
209
212 selinux(8), preupgrade(8), semanage(8), restorecon(8), chcon(1), sepol‐
213 icy(8), setsebool(8)
214preupgrade 21-03-26 preupgrade_selinux(8)