kpatch_selinux(8)

1kpatch_selinux(8)            SELinux Policy kpatch           kpatch_selinux(8)
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NAME

6       kpatch_selinux  -  Security  Enhanced  Linux Policy for the kpatch pro‐
7       cesses
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DESCRIPTION

10       Security-Enhanced Linux  secures  the  kpatch  processes  via  flexible
11       mandatory access control.
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13       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.
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17       For example:
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19       ps -eZ | grep kpatch_t
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ENTRYPOINTS

24       The  kpatch_t  SELinux  type  can be entered via the kpatch_exec_t file
25       type.
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27       The default entrypoint paths for the kpatch_t domain are the following:
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29       /usr/sbin/kpatch
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PROCESS TYPES

32       SELinux defines process types (domains) for each process running on the
33       system
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35       You can see the context of a process using the -Z option to ps
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37       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.
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41       The following process types are defined for kpatch:
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43       kpatch_t
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45       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.
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BOOLEANS

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.
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58       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.
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63       setsebool -P deny_execmem 1
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67       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.
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71       setsebool -P mmap_low_allowed 1
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75       If  you want to disable kernel module loading, you must turn on the se‐
76       cure_mode_insmod boolean. Enabled by default.
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78       setsebool -P secure_mode_insmod 1
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82       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.
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88       setsebool -P selinuxuser_execheap 1
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92       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.
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98       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

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.
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107       file_type
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109            all files on the system
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FILE CONTEXTS

113       SELinux requires files to have an extended attribute to define the file
114       type.
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116       You can see the context of a file using the -Z option to ls
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118       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.
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122       STANDARD FILE CONTEXT
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124       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  specify alternate labeling and then use re‐
127       storecon to put the labels on disk.
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129       semanage fcontext -a -t kpatch_var_lib_t '/srv/mykpatch_content(/.*)?'
130       restorecon -R -v /srv/mykpatch_content
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132       Note: SELinux often uses regular expressions  to  specify  labels  that
133       match multiple files.
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135       The following file types are defined for kpatch:
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139       kpatch_exec_t
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141       -  Set  files with the kpatch_exec_t type, if you want to transition an
142       executable to the kpatch_t domain.
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146       kpatch_var_lib_t
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148       - Set files with the kpatch_var_lib_t type, if you want  to  store  the
149       kpatch files under the /var/lib directory.
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153       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.
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COMMANDS

160       semanage fcontext can also be used to manipulate default  file  context
161       mappings.
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163       semanage  permissive  can  also  be used to manipulate whether or not a
164       process type is permissive.
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166       semanage module can also be used to enable/disable/install/remove  pol‐
167       icy modules.
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169       semanage boolean can also be used to manipulate the booleans
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172       system-config-selinux is a GUI tool available to customize SELinux pol‐
173       icy settings.
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AUTHOR

177       This manual page was auto-generated using sepolicy manpage .
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