(a) OvmfPkg first had to resolve the TpmMeasurementLib class -- for
SECURE_BOOT_ENABLE only -- when the DxeImageVerificationLib instance
became dependent on TpmMeasurementLib. For details, refer to commit
0d28d286bf4d ("OvmfPkg: resolve TpmMeasurementLib dependency
introduced in r14687", 2013-09-21).
(b) At the time, only one instance of TpmMeasurementLib existed, namely
DxeTpmMeasurementLib. This lib instance didn't do anything -- like it
was desirable for OVMF --, because OVMF didn't include any Tcg / TrEE
protocol implementations.
(c) In commit 308521b13354 ("MdeModulePkg: Move TpmMeasurementLib
LibraryClass from SecurityPkg", 2015-07-01), TpmMeasurementLibNull was
introduced.
(d) In commit 285542ebbb03 ("OvmfPkg: Link AuthVariableLib for following
merged variable driver deploy", 2015-07-01), a TpmMeasurementLib
resolution became necessary regardless of SECURE_BOOT_ENABLE. And so
TpmMeasurementLib was resolved to TpmMeasurementLibNull in OVMF, but
only in the non-SECURE_BOOT_ENABLE case. This step -- possibly, the
larger series containing commit 285542ebbb03 -- missed an opportunity
for simplification: given (b), the DxeTpmMeasurementLib instance
should have been simply replaced with the TpmMeasurementLibNull
instance, regardless of SECURE_BOOT_ENABLE.
(e) In commit 1abfa4ce4835 ("Add TPM2 support defined in trusted computing
group.", 2015-08-13), the TrEE dependency was replaced with a Tcg2
dependency in DxeTpmMeasurementLib.
(f) Starting with commit 0c0a50d6b3ff ("OvmfPkg: include Tcg2Dxe module",
2018-03-09), OVMF would include a Tcg2 protocol implementation,
thereby satisfying DxeTpmMeasurementLib's dependency. With
TPM2_ENABLE, it would actually make sense to consume
DxeTpmMeasurementLib -- however, DxeTpmMeasurementLib would never be
used without SECURE_BOOT_ENABLE.
Therefore, we have the following four scenarios:
- TPM2_ENABLE + SECURE_BOOT_ENABLE: works as expected.
- Neither enabled: works as expected.
- Only TPM2_ENABLE: this build is currently incorrect, because
Variable/RuntimeDxe consumes TpmMeasurementLib directly, but
TpmMeasureAndLogData() will never reach the TPM because we link
TpmMeasurementLibNull into the variable driver. This is a problem from
the larger series containing (f).
- Only SECURE_BOOT_ENABLE: this build works as expected, but it is
wasteful -- given that the protocol database will never contain Tcg2
without TPM2_ENABLE, we should simply use TpmMeasurementLibNull. This is
a problem from (d).
Resolving TpmMeasurementLib to DxeTpmMeasurementLib as a function of
*only* TPM2_ENABLE, we can fix / optimize the last two cases.
v2:
- Amend the title and description suggested by Laszlo
- Move TpmMeasurementLib to the existed TPM2_ENABLE block
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Gary Lin <glin@suse.com>
---
OvmfPkg/OvmfPkgIa32.dsc | 4 ++--
OvmfPkg/OvmfPkgIa32X64.dsc | 4 ++--
OvmfPkg/OvmfPkgX64.dsc | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 87716123997a..5bbf87540ab9 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -178,10 +178,8 @@ [LibraryClasses]
!if $(SECURE_BOOT_ENABLE) == TRUE
PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf
- TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf
!else
- TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf
!endif
VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf
@@ -207,8 +205,10 @@ [LibraryClasses]
Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf
Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf
+ TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
!else
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf
+ TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
!endif
[LibraryClasses.common]
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index ad20531ceb8b..5015e92b6eea 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -183,10 +183,8 @@ [LibraryClasses]
!if $(SECURE_BOOT_ENABLE) == TRUE
PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf
- TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf
!else
- TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf
!endif
VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf
@@ -212,8 +210,10 @@ [LibraryClasses]
Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf
Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf
+ TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
!else
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf
+ TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
!endif
[LibraryClasses.common]
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 0542ac2235b4..dda8dac18441 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -183,10 +183,8 @@ [LibraryClasses]
!if $(SECURE_BOOT_ENABLE) == TRUE
PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf
- TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf
!else
- TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf
!endif
VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf
@@ -212,8 +210,10 @@ [LibraryClasses]
Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf
Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf
+ TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf
!else
Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf
+ TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
!endif
[LibraryClasses.common]
--
2.22.0
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On 07/04/19 06:07, Gary Lin wrote: > (a) OvmfPkg first had to resolve the TpmMeasurementLib class -- for > SECURE_BOOT_ENABLE only -- when the DxeImageVerificationLib instance > became dependent on TpmMeasurementLib. For details, refer to commit > 0d28d286bf4d ("OvmfPkg: resolve TpmMeasurementLib dependency > introduced in r14687", 2013-09-21). > > (b) At the time, only one instance of TpmMeasurementLib existed, namely > DxeTpmMeasurementLib. This lib instance didn't do anything -- like it > was desirable for OVMF --, because OVMF didn't include any Tcg / TrEE > protocol implementations. > > (c) In commit 308521b13354 ("MdeModulePkg: Move TpmMeasurementLib > LibraryClass from SecurityPkg", 2015-07-01), TpmMeasurementLibNull was > introduced. > > (d) In commit 285542ebbb03 ("OvmfPkg: Link AuthVariableLib for following > merged variable driver deploy", 2015-07-01), a TpmMeasurementLib > resolution became necessary regardless of SECURE_BOOT_ENABLE. And so > TpmMeasurementLib was resolved to TpmMeasurementLibNull in OVMF, but > only in the non-SECURE_BOOT_ENABLE case. This step -- possibly, the > larger series containing commit 285542ebbb03 -- missed an opportunity > for simplification: given (b), the DxeTpmMeasurementLib instance > should have been simply replaced with the TpmMeasurementLibNull > instance, regardless of SECURE_BOOT_ENABLE. > > (e) In commit 1abfa4ce4835 ("Add TPM2 support defined in trusted computing > group.", 2015-08-13), the TrEE dependency was replaced with a Tcg2 > dependency in DxeTpmMeasurementLib. > > (f) Starting with commit 0c0a50d6b3ff ("OvmfPkg: include Tcg2Dxe module", > 2018-03-09), OVMF would include a Tcg2 protocol implementation, > thereby satisfying DxeTpmMeasurementLib's dependency. With > TPM2_ENABLE, it would actually make sense to consume > DxeTpmMeasurementLib -- however, DxeTpmMeasurementLib would never be > used without SECURE_BOOT_ENABLE. > > Therefore, we have the following four scenarios: > > - TPM2_ENABLE + SECURE_BOOT_ENABLE: works as expected. > > - Neither enabled: works as expected. > > - Only TPM2_ENABLE: this build is currently incorrect, because > Variable/RuntimeDxe consumes TpmMeasurementLib directly, but > TpmMeasureAndLogData() will never reach the TPM because we link > TpmMeasurementLibNull into the variable driver. This is a problem from > the larger series containing (f). > > - Only SECURE_BOOT_ENABLE: this build works as expected, but it is > wasteful -- given that the protocol database will never contain Tcg2 > without TPM2_ENABLE, we should simply use TpmMeasurementLibNull. This is > a problem from (d). > > Resolving TpmMeasurementLib to DxeTpmMeasurementLib as a function of > *only* TPM2_ENABLE, we can fix / optimize the last two cases. > > v2: > - Amend the title and description suggested by Laszlo > - Move TpmMeasurementLib to the existed TPM2_ENABLE block > > Cc: Jordan Justen <jordan.l.justen@intel.com> > Cc: Laszlo Ersek <lersek@redhat.com> > Cc: Marc-André Lureau <marcandre.lureau@redhat.com> > Cc: Stefan Berger <stefanb@linux.ibm.com> > Signed-off-by: Gary Lin <glin@suse.com> > --- > OvmfPkg/OvmfPkgIa32.dsc | 4 ++-- > OvmfPkg/OvmfPkgIa32X64.dsc | 4 ++-- > OvmfPkg/OvmfPkgX64.dsc | 4 ++-- > 3 files changed, 6 insertions(+), 6 deletions(-) Reviewed-by: Laszlo Ersek <lersek@redhat.com> Pushed as commit 1ec05b81e59f. Thanks! Laszlo > diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc > index 87716123997a..5bbf87540ab9 100644 > --- a/OvmfPkg/OvmfPkgIa32.dsc > +++ b/OvmfPkg/OvmfPkgIa32.dsc > @@ -178,10 +178,8 @@ [LibraryClasses] > > !if $(SECURE_BOOT_ENABLE) == TRUE > PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf > - TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf > !else > - TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf > !endif > VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf > @@ -207,8 +205,10 @@ [LibraryClasses] > Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf > Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf > + TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > !else > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf > + TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > !endif > > [LibraryClasses.common] > diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc > index ad20531ceb8b..5015e92b6eea 100644 > --- a/OvmfPkg/OvmfPkgIa32X64.dsc > +++ b/OvmfPkg/OvmfPkgIa32X64.dsc > @@ -183,10 +183,8 @@ [LibraryClasses] > > !if $(SECURE_BOOT_ENABLE) == TRUE > PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf > - TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf > !else > - TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf > !endif > VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf > @@ -212,8 +210,10 @@ [LibraryClasses] > Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf > Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf > + TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > !else > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf > + TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > !endif > > [LibraryClasses.common] > diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc > index 0542ac2235b4..dda8dac18441 100644 > --- a/OvmfPkg/OvmfPkgX64.dsc > +++ b/OvmfPkg/OvmfPkgX64.dsc > @@ -183,10 +183,8 @@ [LibraryClasses] > > !if $(SECURE_BOOT_ENABLE) == TRUE > PlatformSecureLib|OvmfPkg/Library/PlatformSecureLib/PlatformSecureLib.inf > - TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > AuthVariableLib|SecurityPkg/Library/AuthVariableLib/AuthVariableLib.inf > !else > - TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > AuthVariableLib|MdeModulePkg/Library/AuthVariableLibNull/AuthVariableLibNull.inf > !endif > VarCheckLib|MdeModulePkg/Library/VarCheckLib/VarCheckLib.inf > @@ -212,8 +210,10 @@ [LibraryClasses] > Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.inf > Tcg2PpVendorLib|SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf > + TpmMeasurementLib|SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.inf > !else > Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf > + TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf > !endif > > [LibraryClasses.common] > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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