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
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 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.
50
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 allow all daemons to write corefiles to /, you must turn
61 on the daemons_dump_core boolean. Disabled by default.
62 setsebool -P daemons_dump_core 1
64 If you want to enable cluster mode for daemons, you must turn on the
68 daemons_enable_cluster_mode boolean. Enabled by default.
69 setsebool -P daemons_enable_cluster_mode 1
71 If you want to allow all daemons to use tcp wrappers, you must turn on
75 the daemons_use_tcp_wrapper boolean. Disabled by default.
76 setsebool -P daemons_use_tcp_wrapper 1
78 If you want to allow all daemons the ability to read/write terminals,
82 you must turn on the daemons_use_tty boolean. Disabled by default.
83 setsebool -P daemons_use_tty 1
85 If you want to deny user domains applications to map a memory region as
89 both executable and writable, this is dangerous and the executable
90 should be reported in bugzilla, you must turn on the deny_execmem bool‐
91 ean. Enabled by default.
92 setsebool -P deny_execmem 1
94 If you want to deny any process from ptracing or debugging any other
98 processes, you must turn on the deny_ptrace boolean. Enabled by
99 default.
100 setsebool -P deny_ptrace 1
102 If you want to allow any process to mmap any file on system with
106 attribute file_type, you must turn on the domain_can_mmap_files bool‐
107 ean. Enabled by default.
108 setsebool -P domain_can_mmap_files 1
110 If you want to allow all domains write to kmsg_device, while kernel is
114 executed with systemd.log_target=kmsg parameter, you must turn on the
115 domain_can_write_kmsg boolean. Disabled by default.
116 setsebool -P domain_can_write_kmsg 1
118 If you want to allow all domains to use other domains file descriptors,
122 you must turn on the domain_fd_use boolean. Enabled by default.
123 setsebool -P domain_fd_use 1
125 If you want to allow all domains to have the kernel load modules, you
129 must turn on the domain_kernel_load_modules boolean. Disabled by
130 default.
131 setsebool -P domain_kernel_load_modules 1
133 If you want to allow all domains to execute in fips_mode, you must turn
137 on the fips_mode boolean. Enabled by default.
138 setsebool -P fips_mode 1
140 If you want to enable reading of urandom for all domains, you must turn
144 on the global_ssp boolean. Disabled by default.
145 setsebool -P global_ssp 1
147 If you want to control the ability to mmap a low area of the address
151 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
152 the mmap_low_allowed boolean. Disabled by default.
153 setsebool -P mmap_low_allowed 1
155 If you want to disable kernel module loading, you must turn on the
159 secure_mode_insmod boolean. Enabled by default.
160 setsebool -P secure_mode_insmod 1
162 If you want to boolean to determine whether the system permits loading
166 policy, setting enforcing mode, and changing boolean values. Set this
167 to true and you have to reboot to set it back, you must turn on the
168 secure_mode_policyload boolean. Enabled by default.
169 setsebool -P secure_mode_policyload 1
171 If you want to allow unconfined executables to make their heap memory
175 executable. Doing this is a really bad idea. Probably indicates a
176 badly coded executable, but could indicate an attack. This executable
177 should be reported in bugzilla, you must turn on the selin‐
178 uxuser_execheap boolean. Disabled by default.
179 setsebool -P selinuxuser_execheap 1
181 If you want to allow all unconfined executables to use libraries
185 requiring text relocation that are not labeled textrel_shlib_t, you
186 must turn on the selinuxuser_execmod boolean. Enabled by default.
187 setsebool -P selinuxuser_execmod 1
189 If you want to allow unconfined executables to make their stack exe‐
193 cutable. This should never, ever be necessary. Probably indicates a
194 badly coded executable, but could indicate an attack. This executable
195 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
196 stack boolean. Enabled by default.
197 setsebool -P selinuxuser_execstack 1
199 If you want to support X userspace object manager, you must turn on the
203 xserver_object_manager boolean. Enabled by default.
204 setsebool -P xserver_object_manager 1
206
210 The SELinux process type kdumpctl_t can manage files labeled with the
211 following file types. The paths listed are the default paths for these
212 file types. Note the processes UID still need to have DAC permissions.
213 file_type
215 all files on the system
217
220 SELinux requires files to have an extended attribute to define the file
221 type.
222 You can see the context of a file using the -Z option to ls
224 Policy governs the access confined processes have to these files.
226 SELinux kdumpctl policy is very flexible allowing users to setup their
227 kdumpctl processes in as secure a method as possible.
228 STANDARD FILE CONTEXT
230 SELinux defines the file context types for the kdumpctl, if you wanted
232 to store files with these types in a diffent paths, you need to execute
233 the semanage command to sepecify alternate labeling and then use
234 restorecon to put the labels on disk.
235 semanage fcontext -a -t kdumpctl_tmp_t '/srv/mykdumpctl_content(/.*)?'
237 restorecon -R -v /srv/mykdumpctl_content
238 Note: SELinux often uses regular expressions to specify labels that
240 match multiple files.
241 The following file types are defined for kdumpctl:
243 kdumpctl_exec_t
247 - Set files with the kdumpctl_exec_t type, if you want to transition an
249 executable to the kdumpctl_t domain.
250 kdumpctl_tmp_t
254 - Set files with the kdumpctl_tmp_t type, if you want to store kdumpctl
256 temporary files in the /tmp directories.
257 Note: File context can be temporarily modified with the chcon command.
261 If you want to permanently change the file context you need to use the
262 semanage fcontext command. This will modify the SELinux labeling data‐
263 base. You will need to use restorecon to apply the labels.
264
267 semanage fcontext can also be used to manipulate default file context
268 mappings.
269 semanage permissive can also be used to manipulate whether or not a
271 process type is permissive.
272 semanage module can also be used to enable/disable/install/remove pol‐
274 icy modules.
275 semanage boolean can also be used to manipulate the booleans
277 system-config-selinux is a GUI tool available to customize SELinux pol‐
280 icy settings.
281
284 This manual page was auto-generated using sepolicy manpage .
285
288 selinux(8), kdumpctl(8), semanage(8), restorecon(8), chcon(1), sepol‐
289 icy(8) , setsebool(8)
290kdumpctl 19-04-25 kdumpctl_selinux(8)