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| author | Michael Kubacki <michael.a.kubacki@intel.com> | 2019-04-14 11:48:07 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-07-28 01:43:16 +0000 |
| commit | 60b12e69fb1c8c7180fdda92f008248b9ec83db1 (patch) | |
| tree | cf47f09b41ae3c445366f1522ee0ccc27dc10bc5 /UefiCpuPkg | |
| parent | 9bedaec05b7b8ba9aee248361bb61a85a26726cb (diff) | |
| download | edk2-60b12e69fb1c8c7180fdda92f008248b9ec83db1.tar.gz edk2-60b12e69fb1c8c7180fdda92f008248b9ec83db1.tar.bz2 edk2-60b12e69fb1c8c7180fdda92f008248b9ec83db1.zip | |
UefiCpuPkg/CpuMpPei: Add GDT migration support (CVE-2019-11098)
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614
Moves the GDT to permanent memory in a memory discovered
callback. This is done to ensure the GDT authenticated in
pre-memory is not fetched from outside a verified location
after the permanent memory transition.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/CpuMpPei.c | 37 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/CpuMpPei.h | 12 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/CpuMpPei.inf | 1 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/CpuPaging.c | 12 |
4 files changed, 60 insertions, 2 deletions
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.c b/UefiCpuPkg/CpuMpPei/CpuMpPei.c index 07ccbe7c6a..d07540cf74 100644 --- a/UefiCpuPkg/CpuMpPei/CpuMpPei.c +++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.c @@ -430,6 +430,43 @@ GetGdtr ( }
/**
+ Migrates the Global Descriptor Table (GDT) to permanent memory.
+
+ @retval EFI_SUCCESS The GDT was migrated successfully.
+ @retval EFI_OUT_OF_RESOURCES The GDT could not be migrated due to lack of available memory.
+
+**/
+EFI_STATUS
+MigrateGdt (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ UINTN GdtBufferSize;
+ IA32_DESCRIPTOR Gdtr;
+ VOID *GdtBuffer;
+
+ AsmReadGdtr ((IA32_DESCRIPTOR *) &Gdtr);
+ GdtBufferSize = sizeof (IA32_SEGMENT_DESCRIPTOR) -1 + Gdtr.Limit + 1;
+
+ Status = PeiServicesAllocatePool (
+ GdtBufferSize,
+ &GdtBuffer
+ );
+ ASSERT (GdtBuffer != NULL);
+ if (EFI_ERROR (Status)) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ GdtBuffer = ALIGN_POINTER (GdtBuffer, sizeof (IA32_SEGMENT_DESCRIPTOR));
+ CopyMem (GdtBuffer, (VOID *) Gdtr.Base, Gdtr.Limit + 1);
+ Gdtr.Base = (UINTN) GdtBuffer;
+ AsmWriteGdtr (&Gdtr);
+
+ return EFI_SUCCESS;
+}
+
+/**
Initializes CPU exceptions handlers for the sake of stack switch requirement.
This function is a wrapper of InitializeCpuExceptionHandlersEx. It's mainly
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.h b/UefiCpuPkg/CpuMpPei/CpuMpPei.h index 7d5c527d60..309478cbe1 100644 --- a/UefiCpuPkg/CpuMpPei/CpuMpPei.h +++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.h @@ -398,6 +398,18 @@ SecPlatformInformation2 ( );
/**
+ Migrates the Global Descriptor Table (GDT) to permanent memory.
+
+ @retval EFI_SUCCESS The GDT was migrated successfully.
+ @retval EFI_OUT_OF_RESOURCES The GDT could not be migrated due to lack of available memory.
+
+**/
+EFI_STATUS
+MigrateGdt (
+ VOID
+ );
+
+/**
Initializes MP and exceptions handlers.
@param PeiServices The pointer to the PEI Services Table.
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.inf b/UefiCpuPkg/CpuMpPei/CpuMpPei.inf index caead3ce34..f4d11b861f 100644 --- a/UefiCpuPkg/CpuMpPei/CpuMpPei.inf +++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.inf @@ -63,6 +63,7 @@ gUefiCpuPkgTokenSpaceGuid.PcdCpuStackSwitchExceptionList ## SOMETIMES_CONSUMES
gUefiCpuPkgTokenSpaceGuid.PcdCpuKnownGoodStackSize ## SOMETIMES_CONSUMES
gUefiCpuPkgTokenSpaceGuid.PcdCpuApStackSize ## SOMETIMES_CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdMigrateTemporaryRamFirmwareVolumes ## CONSUMES
[Depex]
TRUE
diff --git a/UefiCpuPkg/CpuMpPei/CpuPaging.c b/UefiCpuPkg/CpuMpPei/CpuPaging.c index a462e7ee1e..3bf0574b34 100644 --- a/UefiCpuPkg/CpuMpPei/CpuPaging.c +++ b/UefiCpuPkg/CpuMpPei/CpuPaging.c @@ -602,8 +602,16 @@ MemoryDiscoveredPpiNotifyCallback ( IN VOID *Ppi
)
{
- EFI_STATUS Status;
- BOOLEAN InitStackGuard;
+ EFI_STATUS Status;
+ BOOLEAN InitStackGuard;
+ BOOLEAN InterruptState;
+
+ if (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes)) {
+ InterruptState = SaveAndDisableInterrupts ();
+ Status = MigrateGdt ();
+ ASSERT_EFI_ERROR (Status);
+ SetInterruptState (InterruptState);
+ }
//
// Paging must be setup first. Otherwise the exception TSS setup during MP
|