1kdumpctl_selinux(8) SELinux Policy kdumpctl kdumpctl_selinux(8)
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6 kdumpctl_selinux - Security Enhanced Linux Policy for the kdumpctl pro‐
7 cesses
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10 Security-Enhanced Linux secures the kdumpctl processes via flexible
11 mandatory access control.
12 The kdumpctl processes execute with the kdumpctl_t SELinux type. You
14 can check if you have these processes running by executing the ps com‐
15 mand with the -Z qualifier.
16 For example:
18 ps -eZ | grep kdumpctl_t
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24 The kdumpctl_t SELinux type can be entered via the kdumpctl_exec_t file
25 type.
26 The default entrypoint paths for the kdumpctl_t domain are the follow‐
28 ing:
29 /usr/bin/kdumpctl
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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 kdumpctl policy is very flexible allowing users to setup their kdumpctl
40 processes in as secure a method as possible.
41 The following process types are defined for kdumpctl:
43 kdumpctl_t
45 Note: semanage permissive -a kdumpctl_t can be used to make the process
47 type kdumpctl_t permissive. SELinux does not deny access to permissive
48 process types, but the AVC (SELinux denials) messages are still gener‐
49 ated.
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53 SELinux policy is customizable based on least access required.
54 kdumpctl policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run kdumpctl 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 allow all domains to execute in fips_mode, you must turn
70 on the fips_mode boolean. Enabled by default.
71 setsebool -P fips_mode 1
73 If you want to control the ability to mmap a low area of the address
77 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
78 the mmap_low_allowed boolean. Disabled by default.
79 setsebool -P mmap_low_allowed 1
81 If you want to disable kernel module loading, you must turn on the
85 secure_mode_insmod boolean. Enabled by default.
86 setsebool -P secure_mode_insmod 1
88 If you want to allow unconfined executables to make their heap memory
92 executable. Doing this is a really bad idea. Probably indicates a
93 badly coded executable, but could indicate an attack. This executable
94 should be reported in bugzilla, you must turn on the selin‐
95 uxuser_execheap boolean. Disabled by default.
96 setsebool -P selinuxuser_execheap 1
98 If you want to allow unconfined executables to make their stack exe‐
102 cutable. This should never, ever be necessary. Probably indicates a
103 badly coded executable, but could indicate an attack. This executable
104 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
105 stack boolean. Enabled by default.
106 setsebool -P selinuxuser_execstack 1
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112 The SELinux process type kdumpctl_t can manage files labeled with the
113 following file types. The paths listed are the default paths for these
114 file types. Note the processes UID still need to have DAC permissions.
115 file_type
117 all files on the system
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122 SELinux requires files to have an extended attribute to define the file
123 type.
124 You can see the context of a file using the -Z option to ls
126 Policy governs the access confined processes have to these files.
128 SELinux kdumpctl policy is very flexible allowing users to setup their
129 kdumpctl processes in as secure a method as possible.
130 STANDARD FILE CONTEXT
132 SELinux defines the file context types for the kdumpctl, if you wanted
134 to store files with these types in a diffent paths, you need to execute
135 the semanage command to sepecify alternate labeling and then use
136 restorecon to put the labels on disk.
137 semanage fcontext -a -t kdumpctl_tmp_t '/srv/mykdumpctl_content(/.*)?'
139 restorecon -R -v /srv/mykdumpctl_content
140 Note: SELinux often uses regular expressions to specify labels that
142 match multiple files.
143 The following file types are defined for kdumpctl:
145 kdumpctl_exec_t
149 - Set files with the kdumpctl_exec_t type, if you want to transition an
151 executable to the kdumpctl_t domain.
152 kdumpctl_tmp_t
156 - Set files with the kdumpctl_tmp_t type, if you want to store kdumpctl
158 temporary files in the /tmp directories.
159 Note: File context can be temporarily modified with the chcon command.
163 If you want to permanently change the file context you need to use the
164 semanage fcontext command. This will modify the SELinux labeling data‐
165 base. You will need to use restorecon to apply the labels.
166
169 semanage fcontext can also be used to manipulate default file context
170 mappings.
171 semanage permissive can also be used to manipulate whether or not a
173 process type is permissive.
174 semanage module can also be used to enable/disable/install/remove pol‐
176 icy modules.
177 semanage boolean can also be used to manipulate the booleans
179 system-config-selinux is a GUI tool available to customize SELinux pol‐
182 icy settings.
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186 This manual page was auto-generated using sepolicy manpage .
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190 selinux(8), kdumpctl(8), semanage(8), restorecon(8), chcon(1), sepol‐
191 icy(8), setsebool(8)
192kdumpctl 19-06-18 kdumpctl_selinux(8)