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With /sys/kernel/debug/acpi/custom_method root can write to arbitrary memory and increase his priveleges, even if these are restricted. -> Make this an own debug .config option and warn about the security issue in the config description. -> Still keep acpi/debugfs.c which now only creates an empty /sys/kernel/debug/acpi directory. There might be other users of it later. Signed-off-by: Thomas Renninger <[email protected]> Acked-by: Rafael J. Wysocki <[email protected]> Acked-by: [email protected] Signed-off-by: Len Brown <[email protected]>