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.
118