1kpatch_selinux(8) SELinux Policy kpatch kpatch_selinux(8)
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6 kpatch_selinux - Security Enhanced Linux Policy for the kpatch pro‐
7 cesses
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10 Security-Enhanced Linux secures the kpatch processes via flexible
11 mandatory access control.
12 The kpatch processes execute with the kpatch_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 kpatch_t
20
24 The kpatch_t SELinux type can be entered via the kpatch_exec_t file
25 type.
26 The default entrypoint paths for the kpatch_t domain are the following:
28 /usr/sbin/kpatch
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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 kpatch policy is very flexible allowing users to setup their kpatch
39 processes in as secure a method as possible.
40 The following process types are defined for kpatch:
42 kpatch_t
44 Note: semanage permissive -a kpatch_t can be used to make the process
46 type kpatch_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. kpatch
53 policy is extremely flexible and has several booleans that allow you to
54 manipulate the policy and run kpatch 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 control the ability to mmap a low area of the address
68 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
69 the mmap_low_allowed boolean. Disabled by default.
70 setsebool -P mmap_low_allowed 1
72 If you want to disable kernel module loading, you must turn on the se‐
76 cure_mode_insmod boolean. Enabled by default.
77 setsebool -P secure_mode_insmod 1
79 If you want to allow unconfined executables to make their heap memory
83 executable. Doing this is a really bad idea. Probably indicates a
84 badly coded executable, but could indicate an attack. This executable
85 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
86 echeap boolean. Disabled by default.
87 setsebool -P selinuxuser_execheap 1
89 If you want to allow unconfined executables to make their stack exe‐
93 cutable. This should never, ever be necessary. Probably indicates a
94 badly coded executable, but could indicate an attack. This executable
95 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
96 stack boolean. Enabled by default.
97 setsebool -P selinuxuser_execstack 1
99
103 The SELinux process type kpatch_t can manage files labeled with the
104 following file types. The paths listed are the default paths for these
105 file types. Note the processes UID still need to have DAC permissions.
106 file_type
108 all files on the system
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113 SELinux requires files to have an extended attribute to define the file
114 type.
115 You can see the context of a file using the -Z option to ls
117 Policy governs the access confined processes have to these files.
119 SELinux kpatch policy is very flexible allowing users to setup their
120 kpatch processes in as secure a method as possible.
121 STANDARD FILE CONTEXT
123 SELinux defines the file context types for the kpatch, if you wanted to
125 store files with these types in a diffent paths, you need to execute
126 the semanage command to sepecify alternate labeling and then use re‐
127 storecon to put the labels on disk.
128 semanage fcontext -a -t kpatch_var_lib_t '/srv/mykpatch_content(/.*)?'
130 restorecon -R -v /srv/mykpatch_content
131 Note: SELinux often uses regular expressions to specify labels that
133 match multiple files.
134 The following file types are defined for kpatch:
136 kpatch_exec_t
140 - Set files with the kpatch_exec_t type, if you want to transition an
142 executable to the kpatch_t domain.
143 kpatch_var_lib_t
147 - Set files with the kpatch_var_lib_t type, if you want to store the
149 kpatch files under the /var/lib directory.
150 Note: File context can be temporarily modified with the chcon command.
154 If you want to permanently change the file context you need to use the
155 semanage fcontext command. This will modify the SELinux labeling data‐
156 base. You will need to use restorecon to apply the labels.
157
160 semanage fcontext can also be used to manipulate default file context
161 mappings.
162 semanage permissive can also be used to manipulate whether or not a
164 process type is permissive.
165 semanage module can also be used to enable/disable/install/remove pol‐
167 icy modules.
168 semanage boolean can also be used to manipulate the booleans
170 system-config-selinux is a GUI tool available to customize SELinux pol‐
173 icy settings.
174
177 This manual page was auto-generated using sepolicy manpage .
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181 selinux(8), kpatch(8), semanage(8), restorecon(8), chcon(1), sepol‐
182 icy(8), setsebool(8)
183kpatch 21-06-09 kpatch_selinux(8)