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- introduce wiperam=skip kernel parameter to skip wipe ram

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- introduce `wiperam=force` kernel parameter to force wipe ram inside VMs
This commit is contained in:
Patrick Schleizer 2022-06-30 14:47:45 -04:00
parent 036f518ddc
commit 32fdcf522b
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GPG Key ID: CB8D50BB77BB3C48
2 changed files with 50 additions and 3 deletions
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33
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram-needshutdown.sh
View File

@ -3,4 +3,35 @@
## Copyright (C) 2022 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.
need_shutdown
ram_wipe_check_needshutdown() {
local OLD_DRACUT_QUIET
OLD_DRACUT_QUIET="$DRACUT_QUIET"
DRACUT_QUIET='no'
local kernel_wiperam_setting
kernel_wiperam_setting=$(getarg wiperam)
if [ "$kernel_wiperam_setting" = "skip" ]; then
info "wipe-ram-needshutdown.sh: Skip, because wiperam=skip kernel parameter detected, OK."
DRACUT_QUIET="$OLD_DRACUT_QUIET"
return 0
fi
if [ "$kernel_wiperam_setting" = "force" ]; then
info "wipe-ram-needshutdown.sh: wiperam=force detected, OK."
else
if systemd-detect-virt &>/dev/null ; then
info "wipe-ram-needshutdown.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK."
DRACUT_QUIET="$OLD_DRACUT_QUIET"
return 0
fi
fi
info "wipe-ram-needshutdown.sh: Calling dracut function need_shutdown to drop back into initramfs at shutdown, OK."
need_shutdown
DRACUT_QUIET="$OLD_DRACUT_QUIET"
return 0
}
ram_wipe_check_needshutdown

20
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram.sh
View File

@ -13,11 +13,27 @@ ram_wipe() {
## check_quiet should show info in console.
DRACUT_QUIET='no'
if systemd-detect-virt &>/dev/null ; then
info "wipe-ram.sh: Skip, because VM detected, OK."
local kernel_wiperam_setting
## getarg returns the last parameter only.
## if /proc/cmdline contains 'wiperam=skip wiperam=force' the last one wins.
kernel_wiperam_setting=$(getarg wiperam)
if [ "$kernel_wiperam_setting" = "skip" ]; then
info "wipe-ram.sh: Skip, because wiperam=skip kernel parameter detected, OK."
DRACUT_QUIET="$OLD_DRACUT_QUIET"
return 0
fi
if [ "$kernel_wiperam_setting" = "force" ]; then
info "wipe-ram.sh: wiperam=force detected, OK."
else
if systemd-detect-virt &>/dev/null ; then
info "wipe-ram.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK."
DRACUT_QUIET="$OLD_DRACUT_QUIET"
return 0
fi
fi
info "wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..."
## TODO: sdmem settings. One pass only. Secure? Configurable?