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Add validation on ACPI_S3_CONTEXT.S3DebugBufferAddress, moreover only debug tip could override IDT entry for INT3.

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Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13640 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
vanjeff
2012-08-16 04:36:24 +00:00
parent 54e27ada3e
commit f4a25e813f
3 changed files with 37 additions and 24 deletions
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29
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/X64/SetIdtEntry.c
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@@ -126,23 +126,24 @@ SetIdtEntry (
//
SetupCpuExceptionHandlers ();
//
// Update IDT entry INT3
//
IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (INTERRUPT_GATE_DESCRIPTOR)));
S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress);
IdtEntry->Offset15To0 = (UINT16)S3DebugBuffer;
IdtEntry->SegmentSelector = (UINT16)AsmReadCs ();
IdtEntry->Attributes = (UINT16)INTERRUPT_GATE_ATTRIBUTE;
IdtEntry->Offset31To16 = (UINT16)(S3DebugBuffer >> 16);
IdtEntry->Offset63To32 = (UINT32)(S3DebugBuffer >> 32);
IdtEntry->Reserved = 0;
DEBUG_CODE (
//
// Update IDT entry INT3 if the instruction is valid in it
//
S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress);
if (*(UINTN *)S3DebugBuffer != (UINTN) -1) {
IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (INTERRUPT_GATE_DESCRIPTOR)));
IdtEntry->Offset15To0 = (UINT16)S3DebugBuffer;
IdtEntry->SegmentSelector = (UINT16)AsmReadCs ();
IdtEntry->Attributes = (UINT16)INTERRUPT_GATE_ATTRIBUTE;
IdtEntry->Offset31To16 = (UINT16)(S3DebugBuffer >> 16);
IdtEntry->Offset63To32 = (UINT32)(S3DebugBuffer >> 32);
IdtEntry->Reserved = 0;
}
);
IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (14 * sizeof (INTERRUPT_GATE_DESCRIPTOR)));
HookPageFaultHandler (IdtEntry);
AsmWriteIdtr (IdtDescriptor);
}
/**