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The attached patch adds several interfaces to reference /selinux/status according to sequential-lock logic. selinux_status_open() open the kernel status page and mmap it with read-only mode, or open netlink socket as a fallback in older kernels. Then, we can obtain status information from the mmap'ed page using selinux_status_updated(), selinux_status_getenfoce(), selinux_status_policyload() or selinux_status_deny_unknown(). It enables to help to implement userspace avc with heavy access control decision; that we cannot ignore the cost to communicate with kernel for validation of userspace caches. Signed-off-by: Steve Lawrence <slawrence@tresys.com> |
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