diff options
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c index 07e7ea70de..6902584b1f 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c @@ -1016,6 +1016,7 @@ SmiPFHandler ( {
UINTN PFAddress;
UINTN GuardPageAddress;
+ UINTN ShadowStackGuardPageAddress;
UINTN CpuIndex;
ASSERT (InterruptType == EXCEPT_IA32_PAGE_FAULT);
@@ -1032,7 +1033,7 @@ SmiPFHandler ( }
//
- // If a page fault occurs in SMRAM range, it might be in a SMM stack guard page,
+ // If a page fault occurs in SMRAM range, it might be in a SMM stack/shadow stack guard page,
// or SMM page protection violation.
//
if ((PFAddress >= mCpuHotPlugData.SmrrBase) &&
@@ -1040,10 +1041,16 @@ SmiPFHandler ( DumpCpuContext (InterruptType, SystemContext);
CpuIndex = GetCpuIndex ();
GuardPageAddress = (mSmmStackArrayBase + EFI_PAGE_SIZE + CpuIndex * (mSmmStackSize + mSmmShadowStackSize));
+ ShadowStackGuardPageAddress = (mSmmStackArrayBase + mSmmStackSize + EFI_PAGE_SIZE + CpuIndex * (mSmmStackSize + mSmmShadowStackSize));
if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&
(PFAddress >= GuardPageAddress) &&
(PFAddress < (GuardPageAddress + EFI_PAGE_SIZE))) {
DEBUG ((DEBUG_ERROR, "SMM stack overflow!\n"));
+ } else if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&
+ (mSmmShadowStackSize > 0) &&
+ (PFAddress >= ShadowStackGuardPageAddress) &&
+ (PFAddress < (ShadowStackGuardPageAddress + EFI_PAGE_SIZE))) {
+ DEBUG ((DEBUG_ERROR, "SMM shadow stack overflow!\n"));
} else {
if ((SystemContext.SystemContextX64->ExceptionData & IA32_PF_EC_ID) != 0) {
DEBUG ((DEBUG_ERROR, "SMM exception at execution (0x%lx)\n", PFAddress));
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