Kconfig (4592B)
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.