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| author | Hao Wu <hao.a.wu@intel.com> | 2018-09-13 15:11:35 +0800 |
|---|---|---|
| committer | Hao Wu <hao.a.wu@intel.com> | 2018-11-16 09:00:05 +0800 |
| commit | 7648fe33a559139e61142fca493ce41a8e8589b8 (patch) | |
| tree | b465fcb106971b87c65551b77a5d713e42e0af1a /MdePkg/Library/BaseLib/X64/Lfence.nasm | |
| parent | 94c43d6fa64481e2f9ee1d96949349a0b9254352 (diff) | |
| download | edk2-7648fe33a559139e61142fca493ce41a8e8589b8.tar.gz edk2-7648fe33a559139e61142fca493ce41a8e8589b8.tar.bz2 edk2-7648fe33a559139e61142fca493ce41a8e8589b8.zip | |
MdePkg/BaseLib: Add new AsmLfence API
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1193
This commit will add a new BaseLib API AsmLfence(). This API will perform
a serializing operation on all load-from-memory instructions that were
issued prior to the call of this function. Please note that this API is
only available on IA-32 and x64.
The purpose of adding this API is to mitigate of the [CVE-2017-5753]
Bounds Check Bypass issue when untrusted data are being processed within
SMM. More details can be referred at the 'Bounds check bypass mitigation'
section at the below link:
https://software.intel.com/security-software-guidance/insights/host-firmware-speculative-execution-side-channel-mitigation
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 2ecd829972f8553de83fbf943c5b89863999d7c8)
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/Lfence.nasm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/Lfence.nasm | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/Lfence.nasm b/MdePkg/Library/BaseLib/X64/Lfence.nasm new file mode 100644 index 0000000000..9ee9b563e2 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/Lfence.nasm @@ -0,0 +1,37 @@ +;------------------------------------------------------------------------------ ;
+; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution. The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+; Lfence.nasm
+;
+; Abstract:
+;
+; Performs a serializing operation on all load-from-memory instructions that
+; were issued prior to the call of this function.
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmLfence (
+; VOID
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmLfence)
+ASM_PFX(AsmLfence):
+ lfence
+ ret
|