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fix

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Patrick Schleizer 2022-07-02 17:21:33 -04:00
parent 3bd87d019f
commit 95187bd357
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GPG Key ID: CB8D50BB77BB3C48
1 changed files with 11 additions and 28 deletions
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39
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram.sh
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@ -7,24 +7,6 @@
## First version by @friedy10.
## https://github.com/friedy10/dracut/blob/master/modules.d/40sdmem/wipe.sh
if [ -z "$DRACUT_SYSTEMD" ]; then
warn_debug() {
echo "<28>dracut Warning: $*" > /dev/kmsg
echo "dracut Warning: $*" >&2
}
info_debug() {
echo "<30>dracut Info: $*" > /dev/kmsg
echo "dracut Info: $*" >&2 || :
}
else
warn_debug() {
echo "Warning: $*" >&2
}
info_debug() {
echo "Info: $*"
}
fi
ram_wipe() {
local kernel_wiperam_setting
## getarg returns the last parameter only.
@ -32,45 +14,46 @@ ram_wipe() {
kernel_wiperam_setting=$(getarg wiperam)
if [ "$kernel_wiperam_setting" = "skip" ]; then
info_debug "wipe-ram.sh: Skip, because wiperam=skip kernel parameter detected, OK."
echo "INFO: wipe-ram.sh: Skip, because wiperam=skip kernel parameter detected, OK." > /dev/kmsg
return 0
fi
if [ "$kernel_wiperam_setting" = "force" ]; then
info_debug "wipe-ram.sh: wiperam=force detected, OK."
echo "INFO: wipe-ram.sh: wiperam=force detected, OK." > /dev/kmsg
else
if systemd-detect-virt &>/dev/null ; then
info_debug "wipe-ram.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK."
echo "INFO: wipe-ram.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK." > /dev/kmsg
return 0
fi
fi
info_debug "wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..."
echo "INFO: wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..." > /dev/kmsg
## TODO: sdmem settings. One pass only. Secure? Configurable?
## TODO: > /dev/kmsg 2> /dev/kmsg
sdmem -l -l -v
info_debug "wipe-ram.sh: RAM wipe completed, OK."
echo "INFO: wipe-ram.sh: RAM wipe completed, OK." > /dev/kmsg
## In theory might be better to check this beforehand, but the test is
## really fast. The user has no chance of reading the console output
## without introducing an artificial delay because the sdmem which runs
## after this, results in much more console output.
info_debug "wipe-ram.sh: Checking if there are still mounted encrypted disks..."
echo "INFO: wipe-ram.sh: Checking if there are still mounted encrypted disks..." > /dev/kmsg
local dmsetup_actual_output dmsetup_expected_output
dmsetup_actual_output="$(dmsetup ls --target crypt)"
dmsetup_expected_output="No devices found"
if [ "$dmsetup_actual_output" = "$dmsetup_expected_output" ]; then
info_debug "wipe-ram.sh: Success, there are no more mounted encrypted disks, OK."
echo "INFO: wipe-ram.sh: Success, there are no more mounted encrypted disks, OK." > /dev/kmsg
else
warn_debug "\
wipe-ram.sh: There are still mounted encrypted disks! RAM wipe failed!
echo "\
WARNING: wipe-ram.sh:There are still mounted encrypted disks! RAM wipe failed!
debugging information:
dmsetup_expected_output: '$dmsetup_expected_output'
dmsetup_actual_output: '$dmsetup_actual_output'"
dmsetup_actual_output: '$dmsetup_actual_output'" > /dev/kmsg
fi
sleep 3