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- config SECURITY_SELINUX
- bool "NSA SELinux Support"
- depends on SECURITY_NETWORK && 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_BOOTPARAM_VALUE
- int "NSA SELinux boot parameter default value"
- depends on SECURITY_SELINUX_BOOTPARAM
- range 0 1
- default 1
- help
- This option sets the default value for the kernel parameter
- 'selinux', which allows SELinux to be disabled at boot. If this
- option is set to 0 (zero), the SELinux kernel parameter will
- default to 0, disabling SELinux at bootup. If this option is
- set to 1 (one), the SELinux kernel parameter will default to 1,
- enabling SELinux at bootup.
- If you are unsure how to answer this question, answer 1.
- 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.
- 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 /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
- /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 /selinux/checkreqprot if authorized by policy.
- 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.
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