virt/coco/sev-guest: Double-buffer messages

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[ Upstream commit 965006103a ]

The encryption algorithms read and write directly to shared unencrypted
memory, which may leak information as well as permit the host to tamper
with the message integrity. Instead, copy whole messages in or out as
needed before doing any computation on them.

Fixes: d5af44dde5 ("x86/sev: Provide support for SNP guest request NAEs")
Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230214164638.1189804-3-dionnaglaze@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Dionna Glaze 2023-03-07 20:24:48 +01:00 • committed by Greg Kroah-Hartman

parent 0289170151

commit 577a64725b

1 changed files with 23 additions and 4 deletions

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drivers/virt/coco/sev-guest/sev-guest.c

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