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1# SPDX-License-Identifier: GPL-2.0-only
2config SECURITY_SELINUX
3 bool "NSA SELinux Support"
4 depends on SECURITY_NETWORK && AUDIT && NET && INET
5 select NETWORK_SECMARK
6 default n
7 help
8 This selects NSA 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 "NSA 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_DISABLE
27 bool "NSA SELinux runtime disable"
28 depends on SECURITY_SELINUX
29 select SECURITY_WRITABLE_HOOKS
30 default n
31 help
32 This option enables writing to a selinuxfs node 'disable', which
33 allows SELinux to be disabled at runtime prior to the policy load.
34 SELinux will then remain disabled until the next boot.
35 This option is similar to the selinux=0 boot parameter, but is to
36 support runtime disabling of SELinux, e.g. from /sbin/init, for
37 portability across platforms where boot parameters are difficult
38 to employ.
39
40 NOTE: selecting this option will disable the '__ro_after_init'
41 kernel hardening feature for security hooks. Please consider
42 using the selinux=0 boot parameter instead of enabling this
43 option.
44
45 WARNING: this option is deprecated and will be removed in a future
46 kernel release.
47
48 If you are unsure how to answer this question, answer N.
49
50config SECURITY_SELINUX_DEVELOP
51 bool "NSA SELinux Development Support"
52 depends on SECURITY_SELINUX
53 default y
54 help
55 This enables the development support option of NSA SELinux,
56 which is useful for experimenting with SELinux and developing
57 policies. If unsure, say Y. With this option enabled, the
58 kernel will start in permissive mode (log everything, deny nothing)
59 unless you specify enforcing=1 on the kernel command line. You
60 can interactively toggle the kernel between enforcing mode and
61 permissive mode (if permitted by the policy) via
62 /sys/fs/selinux/enforce.
63
64config SECURITY_SELINUX_AVC_STATS
65 bool "NSA SELinux AVC Statistics"
66 depends on SECURITY_SELINUX
67 default y
68 help
69 This option collects access vector cache statistics to
70 /sys/fs/selinux/avc/cache_stats, which may be monitored via
71 tools such as avcstat.
72
73config SECURITY_SELINUX_CHECKREQPROT_VALUE
74 int "NSA SELinux checkreqprot default value"
75 depends on SECURITY_SELINUX
76 range 0 1
77 default 0
78 help
79 This option sets the default value for the 'checkreqprot' flag
80 that determines whether SELinux checks the protection requested
81 by the application or the protection that will be applied by the
82 kernel (including any implied execute for read-implies-exec) for
83 mmap and mprotect calls. If this option is set to 0 (zero),
84 SELinux will default to checking the protection that will be applied
85 by the kernel. If this option is set to 1 (one), SELinux will
86 default to checking the protection requested by the application.
87 The checkreqprot flag may be changed from the default via the
88 'checkreqprot=' boot parameter. It may also be changed at runtime
89 via /sys/fs/selinux/checkreqprot if authorized by policy.
90
91 WARNING: this option is deprecated and will be removed in a future
92 kernel release.
93
94 If you are unsure how to answer this question, answer 0.
95
96config SECURITY_SELINUX_SIDTAB_HASH_BITS
97 int "NSA SELinux sidtab hashtable size"
98 depends on SECURITY_SELINUX
99 range 8 13
100 default 9
101 help
102 This option sets the number of buckets used in the sidtab hashtable
103 to 2^SECURITY_SELINUX_SIDTAB_HASH_BITS buckets. The number of hash
104 collisions may be viewed at /sys/fs/selinux/ss/sidtab_hash_stats. If
105 chain lengths are high (e.g. > 20) then selecting a higher value here
106 will ensure that lookups times are short and stable.
107
108config SECURITY_SELINUX_SID2STR_CACHE_SIZE
109 int "NSA SELinux SID to context string translation cache size"
110 depends on SECURITY_SELINUX
111 default 256
112 help
113 This option defines the size of the internal SID -> context string
114 cache, which improves the performance of context to string
115 conversion. Setting this option to 0 disables the cache completely.
116
117 If unsure, keep the default value.
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