This patch removes the _DSM Memory Clear and MOR
auto-detect functionality via _PTS, as
_DSM Memory Clear was deprecated in TCG PC Client
Reset Attack Mitigation Spec Version 1.10 revision 17
Family "2.0" and _PTS is deemed security deficient.
Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
Remove unused MemoryClear SMI Handler, which is no longer
used due to _DSM Memory Clear no longer being used.
_DSM Memory Clear was deprecated in 2019 by TCG PC Client
Platform Reset Attack Mitigation Spec Version 1.10 revision 17
Family "2.0".
Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
This patch measures the ExitBootServices invocation to the
TPM even in the case of ExitBootServices failing, per TCG
PC Client Platform Firmware Profile Version 1.06 Revision
52 Family 2.0 section 8.2.4(i).
Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
Allocate EfiACPIMemoryNVS buffer for TCG2 related usage in
Tcg2ConfigPeim. The buffer will be used in Tcg2Acpi driver
to retrive information from SMM environment.
Previously, the buffer used in Tcg2Acpi driver is AcpiNvs
type. But I mistakenly thought the Runtime Data type buffer
should also work. So I used API AllocateRuntimePages() to
allocate buffer in 9a76c7945b and consume the buffer in
e939ecf6c1. Recently we found that if the buffer type is
Runtime Data instead of AcpiNvs, BSOD issue happened after
boot into OS.
So this commit is to Allocate EfiACPIMemoryNVS buffer for
TCG2 usage in SMM to align with the initial code logic.
Signed-off-by: Dun Tan <dun.tan@intel.com>
The value of the Pages for TCG2 communication buffer
should be EFI_SIZE_TO_PAGES(sizeof(TCG_NVS)) instead of
sizeof(TCG_NVS).
Signed-off-by: Dun Tan <dun.tan@intel.com>
This debug print may attempt to print a string without a null
terminator that can lead to a machine check.
The value printed is substituted with a source buffer to still
allow debug.
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
For SMM, the SMM Handlers is to validate the buffer outside MMRAM
including the Primary & NonPrimary buffer.
For MM, the MM Handlers do not need to validate the Primary buffer
if it is passed from MmCore through the MmiHandler() parameter.
Return TRUE directly in this case. But need to validate NonPrimary
buffer that outside MMRAM.
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Hongbin1 Zhang <hongbin1.zhang@intel.com>
Cc: Wei6 Xu <wei6.xu@intel.com>
Cc: Dun Tan <dun.tan@intel.com>
Cc: Yuanhao Xie <yuanhao.xie@intel.com>
Cast pointer type to VOID* to avoid potential build error.
If the two PCD are FixAtBuild, PcdGetPtr will return a const
type pointer. Since the second parameter of BuildGuidDataHob
is VOID*, build error may happen with following log:
C4090: 'function': different 'const' qualifiers
Signed-off-by: Dun Tan <dun.tan@intel.com>
Consume gEdkiiTcg2AcpiCommunicateBufferHobGuid in Tcg2Acpi
driver. Tcg2Acpi will use the buffer stored in the HOB to
exchange information with Tcg2StandaloneMm by the
MM_COMMUNICATION_PROTOCOL.
Signed-off-by: Dun Tan <dun.tan@intel.com>
Install a callback of gEfiPeiMemoryDiscoveredPpiGuid to
build the gEdkiiTcg2AcpiCommunicateBufferHobGuid in the
Tcg2ConfigPei PEIM.
The HOB contains a buffer reserved by MmUnblockMemoryLib.
The buffer will be used in Tcg2Acpi driver to retrive
information from standalone mm environment.
Signed-off-by: Dun Tan <dun.tan@intel.com>
Consume gEdkiiTpmInstanceHobGuid in Tcg2StandaloneMm
driver. It's to avoid using dynamic PcdTpmInstanceGuid
in StandaloneMm driver.
Signed-off-by: Dun Tan <dun.tan@intel.com>
Build following two new HOBs:
gEdkiiTcgPhysicalPresenceInterfaceVerHobGuid
gEdkiiTpmInstanceHobGuid
The two HOBs will be used by Tcg2StandaloneMm driver
to avoid using the related dynamic PCDs.
Signed-off-by: Dun Tan <dun.tan@intel.com>
The signatures for event2 or event3 are now valid TCG SP800155 event
types. Fixes uncrustify formatting.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
Add new api Tpm2ExtendNvIndex.
It is uesd in HashCompleteAndExtend when PcrIndex > MAX_PCR_INDEX.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Wenxing Hou <wenxing.hou@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4752
TdTcg2Dxe and HashLibTdx have been moved to OvmfPkg. So delete the codes
in SecurityPkg and update SecurityPkg.dsc.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4735
When change callback action from FORM_OPEN to RETRIEVE, it is observed
that NVNE disks will not be displayed when the user enters the formset
at the first time. Revisit the formset can see the update.
1. Add HiiUpdateForm() to force reparsing the IFR binary when RETRIEVE.
2. Create dummy label with suppressif statement in VFR for form update
usage.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Ming Tan <ming.tan@intel.com>
Cc: Arthur Chen <arthur.g.chen@intel.com>
Cc: Xiao X Chen <xiao.x.chen@intel.com>
Cc: Tina Chen <tina.chen@intel.com>
Signed-off-by: CindyX Kuo <cindyx.kuo@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Tina Chen <tina.chen@intel.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4735
Should not call HiiGetBrowserData() and HiiSetBrowserData() in
ACTION_FORM_OPEN callback function.
Those APIs are called within OpalHiiSetBrowserData/OpalHiiGetBrowserData
which have been used by OpalHii.c.
Change callback action from FORM_OPEN to RETRIEVE to meet UEFI spec.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Ming Tan <ming.tan@intel.com>
Cc: Arthur Chen <arthur.g.chen@intel.com>
Cc: Xiao X Chen <xiao.x.chen@intel.com>
Cc: Tina Chen <tina.chen@intel.com>
Signed-off-by: CindyX Kuo <cindyx.kuo@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Tina Chen <tina.chen@intel.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4731
TCG2 configuration UI shows all the hash algorithms that TPM hardware
supports in the checkbox. If user only selects one algorithm that is
supported by TPM hardware but not supported by BIOS and uncheck the
others, the SyncPcrAllocationsAndPcrMask in Tcg2Pei will not be able
to decide a viable PCR to activate, then an assert occurs.
Add check against PcdTcg2HashAlgorithmBitmap when deciding whether
to suppress the hash algorithm checkbox to avoid user to select the
hash algorithm which may cause an assert.
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Wei6 Xu <wei6.xu@intel.com>
Reviewed-by: Rahul Kumar <rahul1.kumar@intel.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
Refer to UEFI Spec 2.10 section 13.14, update the parameter 'MediaId'
description for EFI_STORAGE_SECURITY_COMMAND_PROTOCOL function
ReceiveData and SendData.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Qingyu Shang <qingyu.shang@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
__FUNCTION__ is a pre-standard extension that gcc and Visual C++ among
others support, while __func__ was standardized in C99.
Since it's more standard, replace __FUNCTION__ with __func__ throughout
SecurityPkg.
Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4335
CcMeasurement protocol is installed when it is supported in a td-guest. If
the installation of the protocol failed, the guest shall go into
CpuDeadLoop. Because the measurement feature is crucial to a td-guest and
it shall stop running immediately at this situation.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
According to TCG PC Client PFP spec 0021 Section 2.4.4.2 EFI boot variable
should be measured and extended to PCR[1], not PCR[5]. This patch is
proposed to fix this error.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4194
The TdTcg2Dxe lives in the OvmfPkg instead of the SecurityPkg. Having
the TdTcg2Dxe at the same place as Tcg2Dxe will be easier for platforms to
consume.
Definition of PcdCcEventlogAcpiTableLaml and PcdCcEventlogAcpiTableLasa
are also moved from OvmfPkg.dec to SecurityPkg.dec.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Arti Gupta <ARGU@microsoft.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3515
In V4: Fixed patch format and uncrustify cleanup
In V3: Cleaned up comments, debug prints and updated patch to use the
new debug ENUM definitions.
- Replaced EFI_D_INFO with DEBUG_INFO.
- Replaced EFI_D_VERBOSE with DEBUG_VERBOSE.
In V2: Add case to RegisterHashInterfaceLib logic
RegisterHashInterfaceLib needs to correctly handle registering the HashLib
instance supported algorithm bitmap when PcdTpm2HashMask is set to zero.
The current implementation of SyncPcrAllocationsAndPcrMask() triggers
PCR bank reallocation only based on the intersection between
TpmActivePcrBanks and PcdTpm2HashMask.
When the software HashLibBaseCryptoRouter solution is used, no PCR bank
reallocation is occurring based on the supported hashing algorithms
registered by the HashLib instances.
Need to have an additional check for the intersection between the
TpmActivePcrBanks and the PcdTcg2HashAlgorithmBitmap populated by the
HashLib instances present on the platform's BIOS.
Signed-off-by: Rodrigo Gonzalez del Cueto <rodrigo.gonzalez.del.cueto@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2858
In V2: Fixed patch format and uncrustify cleanup
In V1: Add debug functionality to examine TPM extend operations
performed by BIOS and inspect the PCR 00 value prior to
any BIOS measurements.
Signed-off-by: Rodrigo Gonzalez del Cueto <rodrigo.gonzalez.del.cueto@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737
Apply uncrustify changes to .c/.h files in the SecurityPkg package
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3767
Update use of DEBUG_CODE(Expression) if Expression is a complex code
block with if/while/for/case statements that use {}.
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3760
Update all use of ', OPTIONAL' to ' OPTIONAL,' for function params.
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3739
Update all use of EFI_D_* defines in DEBUG() macros to DEBUG_* defines.
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Import Tcg2PlatformPei from edk2-platforms without any modifications.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Import Tcg2PlatformDxe from edk2-platforms without any modifications.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3605
The error message is missing the argument for the status code
print specifier.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3277
Initializes the Status variable in TcgMmReadyToLock().
Fixes a Clang build failure:
Tcg2Smm.c - SecurityPkg\Tcg\Tcg2Smm\Tcg2Smm.c:254:7: error:
variable 'Status' is used uninitialized whenever 'if'
condition is false [-Werror,-Wsometimes-uninitialized]
Initializing this variable is required to address a practical
scenario in which the return value of TcgMmReadyToLock() is
undefined based on conditional evaluation in the function.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Kun Qin <kun.q@outlook.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This changes added usage of MmUnblockMemoryLib to explicitly request
allocated NVS region to be accessible from MM environment. It will bring
in compatibility with architectures that supports full memory blockage
inside MM.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Message-Id: <MWHPR06MB31026F3F8C3FAA39D74CE4BAF3969@MWHPR06MB3102.namprd06.prod.outlook.com>
https://bugzilla.tianocore.org/show_bug.cgi?id=3169
This change added Standalone MM instance of Tcg2. The notify function for
Standalone MM instance is left empty.
A dependency DXE driver with a Depex of gEfiMmCommunication2ProtocolGuid
was created to indicate the readiness of Standalone MM Tcg2 driver.
Lastly, the support of CI build for Tcg2 Standalone MM module is added.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Message-Id: <MWHPR06MB3102C3F99CBADFCC5F8A821CF3969@MWHPR06MB3102.namprd06.prod.outlook.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3169
This change separated the original Tcg2Smm module into 2 drivers: the
SMM driver that registers callback for physical presence and memory
clear; the Tcg2Acpi driver that patches and publishes ACPI table for
runtime use.
Tcg2Smm introduced an SMI root handler to allow Tcg2Acpi to communicate
the NVS region used by Tpm.asl and exchange the registered SwSmiValue.
Lastly, Tcg2Smm driver will publish gTcg2MmSwSmiRegisteredGuid at the end
of entrypoint to ensure Tcg2Acpi to load after Tcg2Smm is ready to
communicate.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Message-Id: <MWHPR06MB310295CC623EF7C062844DFFF3969@MWHPR06MB3102.namprd06.prod.outlook.com>
This change replaced gSmst with gMmst to support broader compatibility
under MM environment for Tcg2Smm driver.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Message-Id: <MWHPR06MB310218F28C7AAF8DB375E963F3969@MWHPR06MB3102.namprd06.prod.outlook.com>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2793
In current implementation TPM2_ChangeEPS command is always available
in the TPM2 operation pull down list in TCG2 Configuration, which
is confusing when the command is not supported by specific TPM chip.
As a user experience improvement, TPM2_ChangeEPS command should be
removed from the list when it is not supported.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614
When we allocate pool to save rebased the PEIMs, the address will change
randomly, therefore the hash will change and result PCR0 change as well.
To avoid this, we save the raw PEIMs and use it to calculate hash.
The TcgPei calculate the hash and it use the Migrated FV Info.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614
When we allocate pool to save rebased the PEIMs, the address will change
randomly, therefore the hash will change and result PCR0 change as well.
To avoid this, we save the raw PEIMs and use it to calculate hash.
The Tcg2Pei calculate the hash and it use the Migrated FV Info.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
And do some code clean with updated function
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2841
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
John Strange
Matthew Carlson
Dun Tan
Michael Kubacki
Jiaxin Wu
Dionna Glaze
Wenxing Hou
Min M Xu
CindyX Kuo
Wei6 Xu
Qingyu Shang
Linus Liu
Rebecca Cran
Rodrigo Gonzalez del Cueto
Michael D Kinney
Stefan Berger
Kun Qin
Zhiguang Liu
Qi Zhang
Guomin Jiang
Jiewen Yao