/** @file\r
Page table manipulation functions for IA-32 processors\r
\r
-Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r
+\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
{\r
UINTN PageFaultHandlerHookAddress;\r
IA32_IDT_GATE_DESCRIPTOR *IdtEntry;\r
+ EFI_STATUS Status;\r
\r
//\r
// Initialize spin lock\r
//\r
InitializeSpinLock (mPFLock);\r
\r
+ mPhysicalAddressBits = 32;\r
+\r
if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r
//\r
// Set own Page Fault entry instead of the default one, because SMM Profile\r
//\r
// Register SMM Page Fault Handler\r
//\r
- SmmRegisterExceptionHandler (&mSmmCpuService, EXCEPT_IA32_PAGE_FAULT, SmiPFHandler);\r
+ Status = SmmRegisterExceptionHandler (&mSmmCpuService, EXCEPT_IA32_PAGE_FAULT, SmiPFHandler);\r
+ ASSERT_EFI_ERROR (Status);\r
}\r
\r
//\r
if (FeaturePcdGet (PcdCpuSmmStackGuard)) {\r
InitializeIDTSmmStackGuard ();\r
}\r
- return Gen4GPageTable (0, TRUE);\r
+ return Gen4GPageTable (TRUE);\r
}\r
\r
/**\r
VOID\r
EFIAPI\r
SmiPFHandler (\r
- IN EFI_EXCEPTION_TYPE InterruptType,\r
- IN EFI_SYSTEM_CONTEXT SystemContext\r
+ IN EFI_EXCEPTION_TYPE InterruptType,\r
+ IN EFI_SYSTEM_CONTEXT SystemContext\r
)\r
{\r
UINTN PFAddress;\r
+ UINTN GuardPageAddress;\r
+ UINTN CpuIndex;\r
\r
ASSERT (InterruptType == EXCEPT_IA32_PAGE_FAULT);\r
\r
\r
PFAddress = AsmReadCr2 ();\r
\r
- if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&\r
- (PFAddress >= mCpuHotPlugData.SmrrBase) &&\r
+ //\r
+ // If a page fault occurs in SMRAM range, it might be in a SMM stack guard page,\r
+ // or SMM page protection violation.\r
+ //\r
+ if ((PFAddress >= mCpuHotPlugData.SmrrBase) &&\r
(PFAddress < (mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize))) {\r
- DEBUG ((EFI_D_ERROR, "SMM stack overflow!\n"));\r
+ DumpCpuContext (InterruptType, SystemContext);\r
+ CpuIndex = GetCpuIndex ();\r
+ GuardPageAddress = (mSmmStackArrayBase + EFI_PAGE_SIZE + CpuIndex * mSmmStackSize);\r
+ if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&\r
+ (PFAddress >= GuardPageAddress) &&\r
+ (PFAddress < (GuardPageAddress + EFI_PAGE_SIZE))) {\r
+ DEBUG ((DEBUG_ERROR, "SMM stack overflow!\n"));\r
+ } else {\r
+ if ((SystemContext.SystemContextIa32->ExceptionData & IA32_PF_EC_ID) != 0) {\r
+ DEBUG ((DEBUG_ERROR, "SMM exception at execution (0x%x)\n", PFAddress));\r
+ DEBUG_CODE (\r
+ DumpModuleInfoByIp (*(UINTN *)(UINTN)SystemContext.SystemContextIa32->Esp);\r
+ );\r
+ } else {\r
+ DEBUG ((DEBUG_ERROR, "SMM exception at access (0x%x)\n", PFAddress));\r
+ DEBUG_CODE (\r
+ DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);\r
+ );\r
+ }\r
+ }\r
CpuDeadLoop ();\r
}\r
\r
//\r
if ((PFAddress < mCpuHotPlugData.SmrrBase) ||\r
(PFAddress >= mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize)) {\r
+ DumpCpuContext (InterruptType, SystemContext);\r
if ((SystemContext.SystemContextIa32->ExceptionData & IA32_PF_EC_ID) != 0) {\r
- DEBUG ((EFI_D_ERROR, "Code executed on IP(0x%x) out of SMM range after SMM is locked!\n", PFAddress));\r
+ DEBUG ((DEBUG_ERROR, "Code executed on IP(0x%x) out of SMM range after SMM is locked!\n", PFAddress));\r
DEBUG_CODE (\r
DumpModuleInfoByIp (*(UINTN *)(UINTN)SystemContext.SystemContextIa32->Esp);\r
);\r
CpuDeadLoop ();\r
}\r
+ if (IsSmmCommBufferForbiddenAddress (PFAddress)) {\r
+ DEBUG ((DEBUG_ERROR, "Access SMM communication forbidden address (0x%x)!\n", PFAddress));\r
+ DEBUG_CODE (\r
+ DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);\r
+ );\r
+ CpuDeadLoop ();\r
+ }\r
+ }\r
+\r
+ //\r
+ // If NULL pointer was just accessed\r
+ //\r
+ if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT1) != 0 &&\r
+ (PFAddress < EFI_PAGE_SIZE)) {\r
+ DEBUG ((DEBUG_ERROR, "!!! NULL pointer access !!!\n"));\r
+ DEBUG_CODE (\r
+ DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);\r
+ );\r
+ CpuDeadLoop ();\r
}\r
\r
if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r
SystemContext.SystemContextIa32->ExceptionData\r
);\r
} else {\r
+ DumpCpuContext (InterruptType, SystemContext);\r
SmiDefaultPFHandler ();\r
}\r
\r
ReleaseSpinLock (mPFLock);\r
}\r
+\r
+/**\r
+ This function sets memory attribute for page table.\r
+**/\r
+VOID\r
+SetPageTableAttributes (\r
+ VOID\r
+ )\r
+{\r
+ UINTN Index2;\r
+ UINTN Index3;\r
+ UINT64 *L1PageTable;\r
+ UINT64 *L2PageTable;\r
+ UINT64 *L3PageTable;\r
+ BOOLEAN IsSplitted;\r
+ BOOLEAN PageTableSplitted;\r
+\r
+ //
+ // Don't mark page table as read-only if heap guard is enabled.
+ //
+ // BIT2: SMM page guard enabled
+ // BIT3: SMM pool guard enabled
+ //
+ if ((PcdGet8 (PcdHeapGuardPropertyMask) & (BIT3 | BIT2)) != 0) {
+ return ;
+ }
+
+ DEBUG ((DEBUG_INFO, "SetPageTableAttributes\n"));\r
+\r
+ //\r
+ // Disable write protection, because we need mark page table to be write protected.\r
+ // We need *write* page table memory, to mark itself to be *read only*.\r
+ //\r
+ AsmWriteCr0 (AsmReadCr0() & ~CR0_WP);\r
+\r
+ do {\r
+ DEBUG ((DEBUG_INFO, "Start...\n"));\r
+ PageTableSplitted = FALSE;\r
+\r
+ L3PageTable = (UINT64 *)GetPageTableBase ();\r
+\r
+ SmmSetMemoryAttributesEx ((EFI_PHYSICAL_ADDRESS)(UINTN)L3PageTable, SIZE_4KB, EFI_MEMORY_RO, &IsSplitted);\r
+ PageTableSplitted = (PageTableSplitted || IsSplitted);\r
+\r
+ for (Index3 = 0; Index3 < 4; Index3++) {\r
+ L2PageTable = (UINT64 *)(UINTN)(L3PageTable[Index3] & ~mAddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r
+ if (L2PageTable == NULL) {\r
+ continue;\r
+ }\r
+\r
+ SmmSetMemoryAttributesEx ((EFI_PHYSICAL_ADDRESS)(UINTN)L2PageTable, SIZE_4KB, EFI_MEMORY_RO, &IsSplitted);\r
+ PageTableSplitted = (PageTableSplitted || IsSplitted);\r
+\r
+ for (Index2 = 0; Index2 < SIZE_4KB/sizeof(UINT64); Index2++) {\r
+ if ((L2PageTable[Index2] & IA32_PG_PS) != 0) {\r
+ // 2M\r
+ continue;\r
+ }\r
+ L1PageTable = (UINT64 *)(UINTN)(L2PageTable[Index2] & ~mAddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r
+ if (L1PageTable == NULL) {\r
+ continue;\r
+ }\r
+ SmmSetMemoryAttributesEx ((EFI_PHYSICAL_ADDRESS)(UINTN)L1PageTable, SIZE_4KB, EFI_MEMORY_RO, &IsSplitted);\r
+ PageTableSplitted = (PageTableSplitted || IsSplitted);\r
+ }\r
+ }\r
+ } while (PageTableSplitted);\r
+\r
+ //\r
+ // Enable write protection, after page table updated.\r
+ //\r
+ AsmWriteCr0 (AsmReadCr0() | CR0_WP);\r
+\r
+ return ;\r
+}\r
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