x86/hyperv: Block root partition functionality in a Confidential VM

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Hyper-V should never specify a VM that is a Confidential VM and also
running in the root partition.  Nonetheless, explicitly block such a
combination to guard against a compromised Hyper-V maliciously trying to
exploit root partition functionality in a Confidential VM to expose
Confidential VM secrets. No known bug is being fixed, but the attack
surface for Confidential VMs on Hyper-V is reduced.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1678894453-95392-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Michael Kelley 2023-03-15 08:34:13 -07:00 • committed by Greg Kroah-Hartman

parent 5c7648e96d

commit 32aae78314

1 changed files with 8 additions and 4 deletions

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arch/x86/kernel/cpu/mshyperv.c

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