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