kernel_selinux(8)

1kernel_selinux(8)            SELinux Policy kernel           kernel_selinux(8)
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NAME

6       kernel_selinux  -  Security  Enhanced  Linux Policy for the kernel pro‐
7       cesses
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DESCRIPTION

10       Security-Enhanced Linux  secures  the  kernel  processes  via  flexible
11       mandatory access control.
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13       The  kernel  processes  execute with the kernel_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 kernel_t
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PROCESS TYPES

24       SELinux defines process types (domains) for each process running on the
25       system
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27       You can see the context of a process using the -Z option to ps
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29       Policy governs the access confined processes have  to  files.   SELinux
30       kernel  policy  is  very  flexible allowing users to setup their kernel
31       processes in as secure a method as possible.
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33       The following process types are defined for kernel:
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35       kernel_t
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37       Note: semanage permissive -a kernel_t can be used to make  the  process
38       type  kernel_t  permissive.  SELinux does not deny access to permissive
39       process types, but the AVC (SELinux denials) messages are still  gener‐
40       ated.
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BOOLEANS

44       SELinux  policy is customizable based on least access required.  kernel
45       policy is extremely flexible and has several booleans that allow you to
46       manipulate the policy and run kernel with the tightest access possible.
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50       If you want to deny user domains applications to map a memory region as
51       both executable and writable, this  is  dangerous  and  the  executable
52       should be reported in bugzilla, you must turn on the deny_execmem bool‐
53       ean. Enabled by default.
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55       setsebool -P deny_execmem 1
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59       If you want to allow all domains to execute in fips_mode, you must turn
60       on the fips_mode boolean. Enabled by default.
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62       setsebool -P fips_mode 1
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66       If  you  want  to control the ability to mmap a low area of the address
67       space, as configured by /proc/sys/vm/mmap_min_addr, you  must  turn  on
68       the mmap_low_allowed boolean. Disabled by default.
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70       setsebool -P mmap_low_allowed 1
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74       If you want to allow any files/directories to be exported read/only via
75       NFS, you  must  turn  on  the  nfs_export_all_ro  boolean.  Enabled  by
76       default.
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78       setsebool -P nfs_export_all_ro 1
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82       If  you  want  to allow any files/directories to be exported read/write
83       via NFS, you must turn on the  nfs_export_all_rw  boolean.  Enabled  by
84       default.
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86       setsebool -P nfs_export_all_rw 1
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90       If  you  want  to  allow  system  to run with NIS, you must turn on the
91       nis_enabled boolean. Disabled by default.
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93       setsebool -P nis_enabled 1
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97       If you want to disable kernel module loading,  you  must  turn  on  the
98       secure_mode_insmod boolean. Enabled by default.
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100       setsebool -P secure_mode_insmod 1
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104       If  you  want to allow unconfined executables to make their heap memory
105       executable.  Doing this is a really  bad  idea.  Probably  indicates  a
106       badly  coded  executable, but could indicate an attack. This executable
107       should  be  reported  in  bugzilla,  you  must  turn  on   the   selin‐
108       uxuser_execheap boolean. Disabled by default.
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110       setsebool -P selinuxuser_execheap 1
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114       If  you  want  to allow unconfined executables to make their stack exe‐
115       cutable.  This should never, ever be necessary.  Probably  indicates  a
116       badly  coded  executable, but could indicate an attack. This executable
117       should be reported in bugzilla, you must turn on the  selinuxuser_exec‐
118       stack boolean. Enabled by default.
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120       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

125       The  SELinux  process  type  kernel_t can manage files labeled with the
126       following file types.  The paths listed are the default paths for these
127       file types.  Note the processes UID still need to have DAC permissions.
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129       file_type
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131            all files on the system
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COMMANDS

135       semanage  fcontext  can also be used to manipulate default file context
136       mappings.
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138       semanage permissive can also be used to manipulate  whether  or  not  a
139       process type is permissive.
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141       semanage  module can also be used to enable/disable/install/remove pol‐
142       icy modules.
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144       semanage boolean can also be used to manipulate the booleans
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147       system-config-selinux is a GUI tool available to customize SELinux pol‐
148       icy settings.
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AUTHOR

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