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audk/MdePkg/Library/BaseLib/Ia32/Lfence.nasm

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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>
2018-09-13 09:11:35 +02:00
;------------------------------------------------------------------------------ ;
; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
MdePkg: Replace BSD License with BSD+Patent License https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
2019-04-04 01:06:00 +02:00
; SPDX-License-Identifier: BSD-2-Clause-Patent
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>
2018-09-13 09:11:35 +02:00
;
; 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:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; AsmLfence (
; VOID
; );
;------------------------------------------------------------------------------
global ASM_PFX(AsmLfence)
ASM_PFX(AsmLfence):
lfence
ret