[edk2-devel] [PATCH v9 00/13] Add the VariablePolicy feature

Bret Barkelew bret at corthon.com
Wed Nov 11 18:43:47 UTC 2020 

To clarify:

The current solution to the MorLock EndOfDxe issue is to expressly call
LockVariablePolicy() in the same locations that mEndOfDxe is set (which was
the mechanism that previously locked the VariableLock interface). This
solution maintains parity with the old design, which is keeping with the
ethos of minimal changes and similar functionality to VariableLock. It does
not introduce any new dependencies.

The only drawback to this approach is that it preserves the strict ordering
that was also previously required by MorLock, which I will attempt to
address in later updates.

On Sun, Nov 8, 2020 at 10:45 PM Bret Barkelew <bret at corthon.com> wrote:

> The 14 patches in this series add the VariablePolicy feature to the core,
> deprecate Edk2VarLock (while adding a compatibility layer to reduce code
> churn), and integrate the VariablePolicy libraries and protocols into
> Variable Services.
>
> Since the integration requires multiple changes, including adding
> libraries,
> a protocol, an SMI communication handler, and VariableServices integration,
> the patches are broken up by individual library additions and then a final
> integration. Security-sensitive changes like bypassing Authenticated
> Variable enforcement are also broken out into individual patches so that
> attention can be called directly to them.
>
> Platform porting instructions are described in this wiki entry:
>
> https://github.com/tianocore/tianocore.github.io/wiki/VariablePolicy-Protocol---Enhanced-Method-for-Managing-Variables#platform-porting
>
> Discussion of the feature can be found in multiple places throughout
> the last year on the RFC channel, staging branches, and in devel.
>
> Most recently, this subject was discussed in this thread:
> https://edk2.groups.io/g/devel/message/53712
> (the code branches shared in that discussion are now out of date, but the
> whitepapers and discussion are relevant).
>
> Cc: Jiewen Yao <jiewen.yao at intel.com>
> Cc: Dandan Bi <dandan.bi at intel.com>
> Cc: Chao Zhang <chao.b.zhang at intel.com>
> Cc: Jian J Wang <jian.j.wang at intel.com>
> Cc: Hao A Wu <hao.a.wu at intel.com>
> Cc: Liming Gao <liming.gao at intel.com>
> Cc: Jordan Justen <jordan.l.justen at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
> Cc: Andrew Fish <afish at apple.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Bret Barkelew <brbarkel at microsoft.com>
> Signed-off-by: Bret Barkelew <brbarkel at microsoft.com>
>
> v9 changes:
> * Rebase
> * Address the event ordering issues around MorLock at EndOfDxe
> * Drop problematic tests
> * Address ECC issues
>
> v8 changes:
> * Rebase
> * Small tweaks from final PRs
> * Drank a lot
> * Enrolled several members and a steward in CatFacts
>
> v7 changes:
> * Address comments from Dandan about security of the MM handler
> * Add readme
> * Fix bug around hex characters in BOOT####, etc
> * Add additional testing for hex characters
> * Add additional testing for authenticated variables
>
> v6 changes:
> * Fix an issue with uninitialized Status in InitVariablePolicyLib() and
> DeinitVariablePolicyLib()
> * Fix GCC building in shell-based functional test
> * Rebase on latest origin/master
>
> v5 changes:
> * Fix the CONST mismatch in VariablePolicy.h and VariablePolicySmmDxe.c
> * Fix EFIAPI mismatches in the functional unittest
> * Rebase on latest origin/master
>
> v4 changes:
> * Remove Optional PcdAllowVariablePolicyEnforcementDisable PCD from
> platforms
> * Rebase on master
> * Migrate to new MmCommunicate2 protocol
> * Fix an oversight in the default return value for InitMmCommonCommBuffer
> * Fix in VariablePolicyLib to allow ExtraInitRuntimeDxe to consume
> variables
>
> V3 changes:
> * Address all non-unittest issues with ECC
> * Make additional style changes
> * Include section name in hunk headers in "ini-style" files
> * Remove requirement for the EdkiiPiSmmCommunicationsRegionTable driver
>   (now allocates its own buffer)
> * Change names from VARIABLE_POLICY_PROTOCOL and
> gVariablePolicyProtocolGuid
>   to EDKII_VARIABLE_POLICY_PROTOCOL and gEdkiiVariablePolicyProtocolGuid
> * Fix GCC warning about initializing externs
> * Add UNI strings for new PCD
> * Add patches for ArmVirtPkg, OvmfXen, and UefiPayloadPkg
> * Reorder patches according to Liming's feedback about adding to platforms
>   before changing variable driver
>
> V2 changes:
> * Fixed implementation for RuntimeDxe
> * Add PCD to block DisableVariablePolicy
> * Fix the DumpVariablePolicy pagination in SMM
>
> Bret Barkelew (13):
>   MdeModulePkg: Define the VariablePolicy protocol interface
>   MdeModulePkg: Define the VariablePolicyLib
>   MdeModulePkg: Define the VariablePolicyHelperLib
>   MdeModulePkg: Define the VarCheckPolicyLib and SMM interface
>   OvmfPkg: Add VariablePolicy engine to OvmfPkg platform
>   EmulatorPkg: Add VariablePolicy engine to EmulatorPkg platform
>   ArmVirtPkg: Add VariablePolicy engine to ArmVirtPkg platform
>   UefiPayloadPkg: Add VariablePolicy engine to UefiPayloadPkg platform
>   MdeModulePkg: Connect VariablePolicy business logic to
>     VariableServices
>   MdeModulePkg: Allow VariablePolicy state to delete protected variables
>   SecurityPkg: Allow VariablePolicy state to delete authenticated
>     variables
>   MdeModulePkg: Change TCG MOR variables to use VariablePolicy
>   MdeModulePkg: Drop VarLock from RuntimeDxe variable driver
>
>  MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.c
>  | 346 ++++++++
>  MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
>  | 396 ++++++++++
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyExtraInitNull.c
>  |  46 ++
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyExtraInitRuntimeDxe.c
> |  85 ++
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.c
>  | 830 ++++++++++++++++++++
>  MdeModulePkg/Universal/Variable/RuntimeDxe/TcgMorLockDxe.c
>  |  52 +-
>  MdeModulePkg/Universal/Variable/RuntimeDxe/TcgMorLockSmm.c
>  |  60 +-
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VarCheck.c
>   |  49 +-
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableDxe.c
>  |  60 ++
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableLockRequestToLock.c
>  |  71 ++
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariablePolicySmmDxe.c
>   | 573 ++++++++++++++
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c
>  |   7 +
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
>  |  14 +
>  SecurityPkg/Library/AuthVariableLib/AuthService.c
>   |  30 +-
>  ArmVirtPkg/ArmVirt.dsc.inc
>  |   4 +
>  EmulatorPkg/EmulatorPkg.dsc
>   |   3 +
>  MdeModulePkg/Include/Guid/VarCheckPolicyMmi.h
>   |  54 ++
>  MdeModulePkg/Include/Library/VariablePolicyHelperLib.h
>  | 164 ++++
>  MdeModulePkg/Include/Library/VariablePolicyLib.h
>  | 207 +++++
>  MdeModulePkg/Include/Protocol/VariablePolicy.h
>  | 157 ++++
>  MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.inf
>  |  42 +
>  MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.uni
>  |  12 +
>  MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.inf
>  |  35 +
>  MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.uni
>  |  12 +
>  MdeModulePkg/Library/VariablePolicyLib/ReadMe.md
>  | 406 ++++++++++
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.inf
>  |  48 ++
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.uni
>  |  12 +
>  MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLibRuntimeDxe.inf
>  |  51 ++
>  MdeModulePkg/MdeModulePkg.ci.yaml
>   |   4 +-
>  MdeModulePkg/MdeModulePkg.dec
>   |  26 +-
>  MdeModulePkg/MdeModulePkg.dsc
>   |   9 +
>  MdeModulePkg/MdeModulePkg.uni
>   |   7 +
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
>   |   5 +
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
>  |   4 +
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>  |  11 +
>  MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.inf
>   |   4 +
>  OvmfPkg/OvmfPkgIa32.dsc
>   |   5 +
>  OvmfPkg/OvmfPkgIa32X64.dsc
>  |   5 +
>  OvmfPkg/OvmfPkgX64.dsc
>  |   5 +
>  OvmfPkg/OvmfXen.dsc
>   |   4 +
>  SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf
>   |   2 +
>  UefiPayloadPkg/UefiPayloadPkgIa32.dsc
>   |   4 +
>  UefiPayloadPkg/UefiPayloadPkgIa32X64.dsc
>  |   4 +
>  43 files changed, 3845 insertions(+), 80 deletions(-)
>  create mode 100644
> MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.c
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyExtraInitNull.c
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyExtraInitRuntimeDxe.c
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.c
>  create mode 100644
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableLockRequestToLock.c
>  create mode 100644
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariablePolicySmmDxe.c
>  create mode 100644 MdeModulePkg/Include/Guid/VarCheckPolicyMmi.h
>  create mode 100644 MdeModulePkg/Include/Library/VariablePolicyHelperLib.h
>  create mode 100644 MdeModulePkg/Include/Library/VariablePolicyLib.h
>  create mode 100644 MdeModulePkg/Include/Protocol/VariablePolicy.h
>  create mode 100644
> MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.inf
>  create mode 100644
> MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.uni
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.inf
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.uni
>  create mode 100644 MdeModulePkg/Library/VariablePolicyLib/ReadMe.md
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.inf
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.uni
>  create mode 100644
> MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLibRuntimeDxe.inf
>
> --
> 2.28.0.windows.1
>
>


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