security/selinux/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config 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
  12 config 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
  26 config 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
  47 config 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
  60 config 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
  69 config 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.