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#!/bin/sh
# Copyright 2010, Canonical, Ltd.
# License: GPLv2
# Author: Kees Cook <kees@ubuntu.com>
set -e

export LANG=C

usage() {
    echo "Usage: $0 [options]"
    echo ""
    echo "Options:"
    echo "  -h, --help  show this help message and exit"
    echo "  --verbose   Explain in detail what has been detected"
}

report() {
    if [ -n "$VERBOSE" ]; then
        echo "$@" >/dev/stderr
    fi
}

VERBOSE=

TEMP=$(getopt -o h --long verbose,help -n check-bios-nx -- "$@")
eval set -- "$TEMP"

while :; do
    case "$1" in
        -h|--help) usage ; exit 0 ;;
        --verbose) VERBOSE=1; shift ;;
        --) shift ; break ;;
        *) usage >&2 ; exit 2 ;;
    esac
done

export VERBOSE

if ! uname -m | egrep -q '^(i.86|x86_64)$' ; then
    report "This script is currently only useful on x86-based CPUs"
    exit 0
fi

# Prepare MSR access
msr="/dev/cpu/0/msr"
if [ ! -r "$msr" ]; then
        modprobe msr
fi
if [ ! -r "$msr" ]; then
        echo "$0: You must be root to run this check." >&2
        exit 2
fi

# Check MSR_IA32_MISC_ENABLE's bit 34, NX_DISABLE
BIT=$(rdmsr --bitfield 34:34 0x1a0 2>/dev/null || true)
if [ "$BIT" = "1" ]; then
	report "FAIL: the NX bit is being filtered by the BIOS on this CPU!"
	exit 1
else
	if egrep -m1 -q '^flags[[:blank:]]*:.*\<nx\>' /proc/cpuinfo ; then
		report "ok: the NX bit is operational on this CPU."
	else
		report "WARNING: the NX bit is not available for this CPU."
	fi
fi
exit 0