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1config SECURITY_SELINUX
2 bool "NSA SELinux Support"
3 depends on SECURITY_NETWORK && AUDIT && NET && INET
4 select NETWORK_SECMARK
5 default n
6 help
7 This selects NSA Security-Enhanced Linux (SELinux).
8 You will also need a policy configuration and a labeled filesystem.
9 If you are unsure how to answer this question, answer N.
10
11config SECURITY_SELINUX_BOOTPARAM
12 bool "NSA SELinux boot parameter"
13 depends on SECURITY_SELINUX
14 default n
15 help
16 This option adds a kernel parameter 'selinux', which allows SELinux
17 to be disabled at boot. If this option is selected, SELinux
18 functionality can be disabled with selinux=0 on the kernel
19 command line. The purpose of this option is to allow a single
20 kernel image to be distributed with SELinux built in, but not
21 necessarily enabled.
22
23 If you are unsure how to answer this question, answer N.
24
25config SECURITY_SELINUX_BOOTPARAM_VALUE
26 int "NSA SELinux boot parameter default value"
27 depends on SECURITY_SELINUX_BOOTPARAM
28 range 0 1
29 default 1
30 help
31 This option sets the default value for the kernel parameter
32 'selinux', which allows SELinux to be disabled at boot. If this
33 option is set to 0 (zero), the SELinux kernel parameter will
34 default to 0, disabling SELinux at bootup. If this option is
35 set to 1 (one), the SELinux kernel parameter will default to 1,
36 enabling SELinux at bootup.
37
38 If you are unsure how to answer this question, answer 1.
39
40config SECURITY_SELINUX_DISABLE
41 bool "NSA SELinux runtime disable"
42 depends on SECURITY_SELINUX
43 select SECURITY_WRITABLE_HOOKS
44 default n
45 help
46 This option enables writing to a selinuxfs node 'disable', which
47 allows SELinux to be disabled at runtime prior to the policy load.
48 SELinux will then remain disabled until the next boot.
49 This option is similar to the selinux=0 boot parameter, but is to
50 support runtime disabling of SELinux, e.g. from /sbin/init, for
51 portability across platforms where boot parameters are difficult
52 to employ.
53
54 NOTE: selecting this option will disable the '__ro_after_init'
55 kernel hardening feature for security hooks. Please consider
56 using the selinux=0 boot parameter instead of enabling this
57 option.
58
59 If you are unsure how to answer this question, answer N.
60
61config SECURITY_SELINUX_DEVELOP
62 bool "NSA SELinux Development Support"
63 depends on SECURITY_SELINUX
64 default y
65 help
66 This enables the development support option of NSA SELinux,
67 which is useful for experimenting with SELinux and developing
68 policies. If unsure, say Y. With this option enabled, the
69 kernel will start in permissive mode (log everything, deny nothing)
70 unless you specify enforcing=1 on the kernel command line. You
71 can interactively toggle the kernel between enforcing mode and
72 permissive mode (if permitted by the policy) via /selinux/enforce.
73
74config SECURITY_SELINUX_AVC_STATS
75 bool "NSA SELinux AVC Statistics"
76 depends on SECURITY_SELINUX
77 default y
78 help
79 This option collects access vector cache statistics to
80 /selinux/avc/cache_stats, which may be monitored via
81 tools such as avcstat.
82
83config SECURITY_SELINUX_CHECKREQPROT_VALUE
84 int "NSA SELinux checkreqprot default value"
85 depends on SECURITY_SELINUX
86 range 0 1
87 default 0
88 help
89 This option sets the default value for the 'checkreqprot' flag
90 that determines whether SELinux checks the protection requested
91 by the application or the protection that will be applied by the
92 kernel (including any implied execute for read-implies-exec) for
93 mmap and mprotect calls. If this option is set to 0 (zero),
94 SELinux will default to checking the protection that will be applied
95 by the kernel. If this option is set to 1 (one), SELinux will
96 default to checking the protection requested by the application.
97 The checkreqprot flag may be changed from the default via the
98 'checkreqprot=' boot parameter. It may also be changed at runtime
99 via /selinux/checkreqprot if authorized by policy.
100
101 If you are unsure how to answer this question, answer 0.
1# SPDX-License-Identifier: GPL-2.0-only
2config SECURITY_SELINUX
3 bool "SELinux Support"
4 depends on SECURITY_NETWORK && AUDIT && NET && INET
5 select NETWORK_SECMARK
6 default n
7 help
8 This selects Security-Enhanced Linux (SELinux).
9 You will also need a policy configuration and a labeled filesystem.
10 If you are unsure how to answer this question, answer N.
11
12config SECURITY_SELINUX_BOOTPARAM
13 bool "SELinux boot parameter"
14 depends on SECURITY_SELINUX
15 default n
16 help
17 This option adds a kernel parameter 'selinux', which allows SELinux
18 to be disabled at boot. If this option is selected, SELinux
19 functionality can be disabled with selinux=0 on the kernel
20 command line. The purpose of this option is to allow a single
21 kernel image to be distributed with SELinux built in, but not
22 necessarily enabled.
23
24 If you are unsure how to answer this question, answer N.
25
26config SECURITY_SELINUX_DEVELOP
27 bool "SELinux Development Support"
28 depends on SECURITY_SELINUX
29 default y
30 help
31 This enables the development support option of SELinux,
32 which is useful for experimenting with SELinux and developing
33 policies. If unsure, say Y. With this option enabled, the
34 kernel will start in permissive mode (log everything, deny nothing)
35 unless you specify enforcing=1 on the kernel command line. You
36 can interactively toggle the kernel between enforcing mode and
37 permissive mode (if permitted by the policy) via
38 /sys/fs/selinux/enforce.
39
40config SECURITY_SELINUX_AVC_STATS
41 bool "SELinux AVC Statistics"
42 depends on SECURITY_SELINUX
43 default y
44 help
45 This option collects access vector cache statistics to
46 /sys/fs/selinux/avc/cache_stats, which may be monitored via
47 tools such as avcstat.
48
49config SECURITY_SELINUX_SIDTAB_HASH_BITS
50 int "SELinux sidtab hashtable size"
51 depends on SECURITY_SELINUX
52 range 8 13
53 default 9
54 help
55 This option sets the number of buckets used in the sidtab hashtable
56 to 2^SECURITY_SELINUX_SIDTAB_HASH_BITS buckets. The number of hash
57 collisions may be viewed at /sys/fs/selinux/ss/sidtab_hash_stats. If
58 chain lengths are high (e.g. > 20) then selecting a higher value here
59 will ensure that lookups times are short and stable.
60
61config SECURITY_SELINUX_SID2STR_CACHE_SIZE
62 int "SELinux SID to context string translation cache size"
63 depends on SECURITY_SELINUX
64 default 256
65 help
66 This option defines the size of the internal SID -> context string
67 cache, which improves the performance of context to string
68 conversion. Setting this option to 0 disables the cache completely.
69
70 If unsure, keep the default value.
71
72config SECURITY_SELINUX_DEBUG
73 bool "SELinux kernel debugging support"
74 depends on SECURITY_SELINUX
75 default n
76 help
77 This enables debugging code designed to help SELinux kernel
78 developers, unless you know what this does in the kernel code you
79 should leave this disabled.
80
81 To fine control the messages to be printed enable
82 CONFIG_DYNAMIC_DEBUG and see
83 Documentation/admin-guide/dynamic-debug-howto.rst for additional
84 information.
85
86 Example usage:
87
88 echo -n 'file "security/selinux/*" +p' > \
89 /proc/dynamic_debug/control