Messages in this thread | | | Date | Sun, 6 Jan 2019 19:10:27 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH 0/5 v2][RFC] Encryption and authentication for hibernate snapshot image |
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Hi!
> This patchset is the implementation of encryption and authentication > for hibernate snapshot image. The image will be encrypted by AES and > authenticated by HMAC.
Ok, so you encrypt.
> The hibernate function can be used to snapshot memory pages to an image, > then kernel restores the image to memory space in a appropriate time. > There have secrets in snapshot image and cracker may modifies it for > hacking system. Encryption and authentication of snapshot image can protect > the system. > > Hibernate function requests the master key through key retention service. > The snapshot master key can be a trusted key or a user defined key. The > name of snapshot master key is fixed to "swsusp-kmk". User should loads > swsusp-kmk to kernel by keyctl tool before the hibernation resume. > e.g. The swsusp-kmk must be loaded before systemd-hibernate-resume
But if userspace has a key, encryption is useless against root.
> The TPM trusted key type is preferred to be the master key. But user > defined key can also be used for testing or when the platform doesn't > have TPM. User must be aware that the security of user key relies on > user space. If the root account be compromised, then the user key will > easy to be grabbed.
In the TPM case, does userland have access to the key?
Please explain your security goals.
Pavel
> Lee, Chun-Yi (5): > PM / hibernate: Create snapshot keys handler > PM / hibernate: Generate and verify signature for snapshot image > PM / hibernate: Encrypt snapshot image > PM / hibernate: Erase the snapshot master key in snapshot pages > PM / hibernate: An option to request that snapshot image must be > authenticated > > Documentation/admin-guide/kernel-parameters.txt | 6 + > include/linux/kernel.h | 3 +- > kernel/panic.c | 1 + > kernel/power/Kconfig | 25 + > kernel/power/Makefile | 1 + > kernel/power/hibernate.c | 59 ++- > kernel/power/power.h | 59 +++ > kernel/power/snapshot.c | 576 +++++++++++++++++++++++- > kernel/power/snapshot_key.c | 312 +++++++++++++ > kernel/power/swap.c | 6 + > kernel/power/user.c | 12 + > 11 files changed, 1042 insertions(+), 18 deletions(-) > create mode 100644 kernel/power/snapshot_key.c >
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