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 If you are unsure how to answer this question, answer N. 46 47config SECURITY_SELINUX_DEVELOP 48 bool "NSA SELinux Development Support" 49 depends on SECURITY_SELINUX 50 default y 51 help 52 This enables the development support option of NSA SELinux, 53 which is useful for experimenting with SELinux and developing 54 policies. If unsure, say Y. With this option enabled, the 55 kernel will start in permissive mode (log everything, deny nothing) 56 unless you specify enforcing=1 on the kernel command line. You 57 can interactively toggle the kernel between enforcing mode and 58 permissive mode (if permitted by the policy) via /selinux/enforce. 59 60config SECURITY_SELINUX_AVC_STATS 61 bool "NSA SELinux AVC Statistics" 62 depends on SECURITY_SELINUX 63 default y 64 help 65 This option collects access vector cache statistics to 66 /selinux/avc/cache_stats, which may be monitored via 67 tools such as avcstat. 68 69config SECURITY_SELINUX_CHECKREQPROT_VALUE 70 int "NSA SELinux checkreqprot default value" 71 depends on SECURITY_SELINUX 72 range 0 1 73 default 0 74 help 75 This option sets the default value for the 'checkreqprot' flag 76 that determines whether SELinux checks the protection requested 77 by the application or the protection that will be applied by the 78 kernel (including any implied execute for read-implies-exec) for 79 mmap and mprotect calls. If this option is set to 0 (zero), 80 SELinux will default to checking the protection that will be applied 81 by the kernel. If this option is set to 1 (one), SELinux will 82 default to checking the protection requested by the application. 83 The checkreqprot flag may be changed from the default via the 84 'checkreqprot=' boot parameter. It may also be changed at runtime 85 via /selinux/checkreqprot if authorized by policy. 86 87 If you are unsure how to answer this question, answer 0. 88