| # SPDX-License-Identifier: GPL-2.0-only |
| config SECURITY_SELINUX |
| bool "NSA SELinux Support" |
| depends on SECURITY_NETWORK && AUDIT && NET && INET |
| select NETWORK_SECMARK |
| default n |
| help |
| This selects NSA Security-Enhanced Linux (SELinux). |
| You will also need a policy configuration and a labeled filesystem. |
| If you are unsure how to answer this question, answer N. |
| |
| config SECURITY_SELINUX_BOOTPARAM |
| bool "NSA SELinux boot parameter" |
| depends on SECURITY_SELINUX |
| default n |
| help |
| This option adds a kernel parameter 'selinux', which allows SELinux |
| to be disabled at boot. If this option is selected, SELinux |
| functionality can be disabled with selinux=0 on the kernel |
| command line. The purpose of this option is to allow a single |
| kernel image to be distributed with SELinux built in, but not |
| necessarily enabled. |
| |
| If you are unsure how to answer this question, answer N. |
| |
| config SECURITY_SELINUX_DISABLE |
| bool "NSA SELinux runtime disable" |
| depends on SECURITY_SELINUX |
| select SECURITY_WRITABLE_HOOKS |
| default n |
| help |
| This option enables writing to a selinuxfs node 'disable', which |
| allows SELinux to be disabled at runtime prior to the policy load. |
| SELinux will then remain disabled until the next boot. |
| This option is similar to the selinux=0 boot parameter, but is to |
| support runtime disabling of SELinux, e.g. from /sbin/init, for |
| portability across platforms where boot parameters are difficult |
| to employ. |
| |
| NOTE: selecting this option will disable the '__ro_after_init' |
| kernel hardening feature for security hooks. Please consider |
| using the selinux=0 boot parameter instead of enabling this |
| option. |
| |
| WARNING: this option is deprecated and will be removed in a future |
| kernel release. |
| |
| If you are unsure how to answer this question, answer N. |
| |
| config SECURITY_SELINUX_DEVELOP |
| bool "NSA SELinux Development Support" |
| depends on SECURITY_SELINUX |
| default y |
| help |
| This enables the development support option of NSA SELinux, |
| which is useful for experimenting with SELinux and developing |
| policies. If unsure, say Y. With this option enabled, the |
| kernel will start in permissive mode (log everything, deny nothing) |
| unless you specify enforcing=1 on the kernel command line. You |
| can interactively toggle the kernel between enforcing mode and |
| permissive mode (if permitted by the policy) via |
| /sys/fs/selinux/enforce. |
| |
| config SECURITY_SELINUX_AVC_STATS |
| bool "NSA SELinux AVC Statistics" |
| depends on SECURITY_SELINUX |
| default y |
| help |
| This option collects access vector cache statistics to |
| /sys/fs/selinux/avc/cache_stats, which may be monitored via |
| tools such as avcstat. |
| |
| config SECURITY_SELINUX_CHECKREQPROT_VALUE |
| int "NSA SELinux checkreqprot default value" |
| depends on SECURITY_SELINUX |
| range 0 1 |
| default 0 |
| help |
| This option sets the default value for the 'checkreqprot' flag |
| that determines whether SELinux checks the protection requested |
| by the application or the protection that will be applied by the |
| kernel (including any implied execute for read-implies-exec) for |
| mmap and mprotect calls. If this option is set to 0 (zero), |
| SELinux will default to checking the protection that will be applied |
| by the kernel. If this option is set to 1 (one), SELinux will |
| default to checking the protection requested by the application. |
| The checkreqprot flag may be changed from the default via the |
| 'checkreqprot=' boot parameter. It may also be changed at runtime |
| via /sys/fs/selinux/checkreqprot if authorized by policy. |
| |
| WARNING: this option is deprecated and will be removed in a future |
| kernel release. |
| |
| If you are unsure how to answer this question, answer 0. |
| |
| config SECURITY_SELINUX_SIDTAB_HASH_BITS |
| int "NSA SELinux sidtab hashtable size" |
| depends on SECURITY_SELINUX |
| range 8 13 |
| default 9 |
| help |
| This option sets the number of buckets used in the sidtab hashtable |
| to 2^SECURITY_SELINUX_SIDTAB_HASH_BITS buckets. The number of hash |
| collisions may be viewed at /sys/fs/selinux/ss/sidtab_hash_stats. If |
| chain lengths are high (e.g. > 20) then selecting a higher value here |
| will ensure that lookups times are short and stable. |
| |
| config SECURITY_SELINUX_SID2STR_CACHE_SIZE |
| int "NSA SELinux SID to context string translation cache size" |
| depends on SECURITY_SELINUX |
| default 256 |
| help |
| This option defines the size of the internal SID -> context string |
| cache, which improves the performance of context to string |
| conversion. Setting this option to 0 disables the cache completely. |
| |
| If unsure, keep the default value. |
