x86/sev: Check for user-space IOIO pointing to kernel space

stable inclusion
from stable-v5.10.199
commit 6550cbe25de182f6c0176909a90b324cb375133f
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I8BCTB
CVE: CVE-2023-46813

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6550cbe25de182f6c0176909a90b324cb375133f



--------------------------------

Upstream commit: 63e44bc5

Check the memory operand of INS/OUTS before emulating the instruction.
The #VC exception can get raised from user-space, but the memory operand
can be manipulated to access kernel memory before the emulation actually
begins and after the exception handler has run.

  [ bp: Massage commit message. ]

Fixes: 597cfe48 ("x86/boot/compressed/64: Setup a GHCB-based VC Exception handler")
Reported-by: Tom Dohrmann <erbse.13@gmx.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
(cherry picked from commit 658245d6)