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In the case where the SELinux security module is not loaded in the kernel and it's early enough in the boot process that /proc has not yet been mounted, selinuxfs_exists() will incorrectly return 1, and selinux_init_load_policy() will print a message like this to the console: Mount failed for selinuxfs on /sys/fs/selinux: No such file or directory To fix this, mount the procfs before attempting to open /proc/filesystems, and unmount it when done if it was initially not mounted. This is the same thing that selinux_init_load_policy() does when reading /proc/cmdline. Signed-off-by: Ben Shelton <ben.shelton@ni.com>