kernel_selinux(8)

1kernel_selinux(8)            SELinux Policy kernel           kernel_selinux(8)
2
3
4

NAME

6       kernel_selinux  -  Security  Enhanced  Linux Policy for the kernel pro‐
7       cesses
8

DESCRIPTION

10       Security-Enhanced Linux  secures  the  kernel  processes  via  flexible
11       mandatory access control.
12
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.
16
17       For example:
18
19       ps -eZ | grep kernel_t
20
21
22

PROCESS TYPES

24       SELinux defines process types (domains) for each process running on the
25       system
26
27       You can see the context of a process using the -Z option to ps
28
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.
32
33       The following process types are defined for kernel:
34
35       kernel_t
36
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.
41
42

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.
47
48
49
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.
54
55       setsebool -P deny_execmem 1
56
57
58
59       If you want to control the ability to mmap a low area  of  the  address
60       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
61       the mmap_low_allowed boolean. Disabled by default.
62
63       setsebool -P mmap_low_allowed 1
64
65
66
67       If you want to disable kernel module loading, you must turn on the  se‐
68       cure_mode_insmod boolean. Enabled by default.
69
70       setsebool -P secure_mode_insmod 1
71
72
73
74       If  you  want to allow unconfined executables to make their heap memory
75       executable.  Doing this is a really  bad  idea.  Probably  indicates  a
76       badly  coded  executable, but could indicate an attack. This executable
77       should be reported in bugzilla, you must turn  on  the  selinuxuser_ex‐
78       echeap boolean. Disabled by default.
79
80       setsebool -P selinuxuser_execheap 1
81
82
83
84       If  you  want  to allow unconfined executables to make their stack exe‐
85       cutable.  This should never, ever be necessary.  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_exec‐
88       stack boolean. Enabled by default.
89
90       setsebool -P selinuxuser_execstack 1
91
92
93

MANAGED FILES

95       The  SELinux  process  type  kernel_t can manage files labeled with the
96       following file types.  The paths listed are the default paths for these
97       file types.  Note the processes UID still need to have DAC permissions.
98
99       file_type
100
101            all files on the system
102
103

COMMANDS

105       semanage  fcontext  can also be used to manipulate default file context
106       mappings.
107
108       semanage permissive can also be used to manipulate  whether  or  not  a
109       process type is permissive.
110
111       semanage  module can also be used to enable/disable/install/remove pol‐
112       icy modules.
113
114       semanage boolean can also be used to manipulate the booleans
115
116
117       system-config-selinux is a GUI tool available to customize SELinux pol‐
118       icy settings.
119
120

AUTHOR

122       This manual page was auto-generated using sepolicy manpage .
123
124