x86/sev: Check IOBM for IOIO exceptions from user-space
Upstream commit: b9cb9c45583b911e0db71d09caa6b56469eb2bdf
Check the IO permission bitmap (if present) before emulating IOIO #VC
exceptions for user-space. These permissions are checked by hardware
already before the #VC is raised, but due to the VC-handler decoding
race it needs to be checked again in software.
Cherry-pick to release branch to fix CVE-2023-46813.
BUG=b/309761155
TEST=presubmit
RELEASE_NOTE=None
Fixes: 25189d08e516 ("x86/sev-es: Add support for handling IOIO exceptions")
Reported-by: Tom Dohrmann <erbse.13@gmx.de>
Change-Id: Icdd55335912d0aa3a8179cdefa58943e580eb4c4
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Tom Dohrmann <erbse.13@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/60998
Reviewed-by: Nandhini Rengaraj <nrengaraj@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
3 files changed
