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wipe RAM at shutdown: Ensure any remaining disk cache is erased by Linux' memory poisoning

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by running:
`echo 3 > /proc/sys/vm/drop_caches`

Inspired by Tails:
https://gitlab.tails.boum.org/tails/tails/-/blob/master/config/chroot_local-includes/usr/local/lib/initramfs-pre-shutdown-hook
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Patrick Schleizer 2022-07-02 18:12:36 -04:00
parent e783ddc71e
commit 973f117aa6
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4
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram.sh
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@ -29,6 +29,10 @@ ram_wipe() {
echo "INFO: wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..." > /dev/kmsg
## https://gitlab.tails.boum.org/tails/tails/-/blob/master/config/chroot_local-includes/usr/local/lib/initramfs-pre-shutdown-hook
### Ensure any remaining disk cache is erased by Linux' memory poisoning
echo 3 > /proc/sys/vm/drop_caches
## TODO: sdmem settings. One pass only. Secure? Configurable?
## TODO: > /dev/kmsg 2> /dev/kmsg
sdmem -l -l -v