What: /sys/fs/selinux/disable
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Date: April 2005 (predates git)
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KernelVersion: 2.6.12-rc2 (predates git)
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Contact: selinux@vger.kernel.org
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Description:
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The selinuxfs "disable" node allows SELinux to be disabled at runtime
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prior to a policy being loaded into the kernel. If disabled via this
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mechanism, SELinux will remain disabled until the system is rebooted.
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The preferred method of disabling SELinux is via the "selinux=0" boot
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parameter, but the selinuxfs "disable" node was created to make it
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easier for systems with primitive bootloaders that did not allow for
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easy modification of the kernel command line. Unfortunately, allowing
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for SELinux to be disabled at runtime makes it difficult to secure the
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kernel's LSM hooks using the "__ro_after_init" feature.
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Thankfully, the need for the SELinux runtime disable appears to be
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gone, the default Kconfig configuration disables this selinuxfs node,
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and only one of the major distributions, Fedora, supports disabling
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SELinux at runtime. Fedora is in the process of removing the
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selinuxfs "disable" node and once that is complete we will start the
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slow process of removing this code from the kernel.
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More information on /sys/fs/selinux/disable can be found under the
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CONFIG_SECURITY_SELINUX_DISABLE Kconfig option.
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