x86/boot/compressed/64: Check SEV encryption in the 32-bit boot-path

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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

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Joerg Roedel 2021-03-12 13:38:23 +01:00 • committed by Borislav Petkov

parent e927e62d8e

commit fef81c8626

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arch/x86/boot/compressed/head_64.S

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