Joerg Roedel d28aa3c157 x86/boot/compressed/64: Check SEV encryption in the 32-bit boot-path
commit fef81c86262879d4b1176ef51a834c15b805ebb9 upstream.

Check whether the hypervisor reported the correct C-bit when running
as an SEV guest. Using a wrong C-bit position could be used to leak
sensitive data from the guest to the hypervisor.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210312123824.306-8-joro@8bytes.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-26 12:06:57 +02:00
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