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 al‐
55 low you to manipulate the policy and run kdumpctl with the tightest ac‐
56 cess 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 se‐
78 cure_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 selinuxuser_ex‐
88 echeap 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. Enabled by default.
99 setsebool -P selinuxuser_execstack 1
101
105 The SELinux process type kdumpctl_t can manage files labeled with the
106 following file types. The paths listed are the default paths for these
107 file types. Note the processes UID still need to have DAC permissions.
108 file_type
110 all files on the system
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115 SELinux requires files to have an extended attribute to define the file
116 type.
117 You can see the context of a file using the -Z option to ls
119 Policy governs the access confined processes have to these files.
121 SELinux kdumpctl policy is very flexible allowing users to setup their
122 kdumpctl processes in as secure a method as possible.
123 STANDARD FILE CONTEXT
125 SELinux defines the file context types for the kdumpctl, if you wanted
127 to store files with these types in a diffent paths, you need to execute
128 the semanage command to sepecify alternate labeling and then use re‐
129 storecon to put the labels on disk.
130 semanage fcontext -a -t kdumpctl_tmp_t '/srv/mykdumpctl_content(/.*)?'
132 restorecon -R -v /srv/mykdumpctl_content
133 Note: SELinux often uses regular expressions to specify labels that
135 match multiple files.
136 The following file types are defined for kdumpctl:
138 kdumpctl_exec_t
142 - Set files with the kdumpctl_exec_t type, if you want to transition an
144 executable to the kdumpctl_t domain.
145 kdumpctl_tmp_t
149 - Set files with the kdumpctl_tmp_t type, if you want to store kdumpctl
151 temporary files in the /tmp directories.
152 Note: File context can be temporarily modified with the chcon command.
156 If you want to permanently change the file context you need to use the
157 semanage fcontext command. This will modify the SELinux labeling data‐
158 base. You will need to use restorecon to apply the labels.
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162 semanage fcontext can also be used to manipulate default file context
163 mappings.
164 semanage permissive can also be used to manipulate whether or not a
166 process type is permissive.
167 semanage module can also be used to enable/disable/install/remove pol‐
169 icy modules.
170 semanage boolean can also be used to manipulate the booleans
172 system-config-selinux is a GUI tool available to customize SELinux pol‐
175 icy settings.
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179 This manual page was auto-generated using sepolicy manpage .
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183 selinux(8), kdumpctl(8), semanage(8), restorecon(8), chcon(1), sepol‐
184 icy(8), setsebool(8)
185kdumpctl 21-06-09 kdumpctl_selinux(8)