mirror of https://github.com/acidanthera/audk.git
UefiCpuPkg/PiSmmCpu: Fixed #double fault on #page fault.
This patch fixes https://bugzilla.tianocore.org/show_bug.cgi?id=246 Previously, when SMM exception happens after EndOfDxe, with StackGuard enabled on IA32, the #double fault exception is reported instead of #page fault. Root cause is below: Current EDKII SMM page protection will lock GDT. If IA32 stack guard is enabled, the page fault handler will do task switch. This task switch need write busy flag in GDT, and write TSS. However, the GDT and TSS is locked at that time, so the double fault happens. We decide to not lock GDT for IA32 StackGuard enabled. This issue does not exist on X64, or IA32 without StackGuard. Cc: Laszlo Ersek <lersek@redhat.com> Cc: Jeff Fan <jeff.fan@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Jiewen Yao
parent
f1afa0a92d
commit
e4435f710c
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@ -126,6 +126,61 @@ InitGdt (
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return GdtTssTables;
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}
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/**
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This function sets GDT/IDT buffer to be RO and XP.
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**/
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VOID
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PatchGdtIdtMap (
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VOID
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)
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{
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EFI_PHYSICAL_ADDRESS BaseAddress;
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UINTN Size;
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//
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// GDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - GDT:\n"));
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BaseAddress = mGdtBuffer;
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Size = ALIGN_VALUE(mGdtBufferSize, SIZE_4KB);
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if (!FeaturePcdGet (PcdCpuSmmStackGuard)) {
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//
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// Do not set RO for IA32 when stack guard feature is enabled.
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// Stack Guard need use task switch to switch stack.
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// It need write GDT and TSS.
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//
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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}
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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//
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// IDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - IDT:\n"));
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BaseAddress = gcSmiIdtr.Base;
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Size = ALIGN_VALUE(gcSmiIdtr.Limit + 1, SIZE_4KB);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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}
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/**
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Transfer AP to safe hlt-loop after it finished restore CPU features on S3 patch.
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@ -497,6 +497,14 @@ InitGdt (
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OUT UINTN *GdtStepSize
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);
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/**
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This function sets GDT/IDT buffer to be RO and XP.
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**/
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VOID
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PatchGdtIdtMap (
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VOID
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);
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/**
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Register the SMM Foundation entry point.
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@ -569,6 +577,66 @@ SmmBlockingStartupThisAp (
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IN OUT VOID *ProcArguments OPTIONAL
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);
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/**
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This function sets the attributes for the memory region specified by BaseAddress and
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Length from their current attributes to the attributes specified by Attributes.
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@param[in] BaseAddress The physical address that is the start address of a memory region.
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@param[in] Length The size in bytes of the memory region.
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@param[in] Attributes The bit mask of attributes to set for the memory region.
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@retval EFI_SUCCESS The attributes were set for the memory region.
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@retval EFI_ACCESS_DENIED The attributes for the memory resource range specified by
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BaseAddress and Length cannot be modified.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of attributes that
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cannot be set together.
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@retval EFI_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of
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the memory resource range.
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@retval EFI_UNSUPPORTED The processor does not support one or more bytes of the memory
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resource range specified by BaseAddress and Length.
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The bit mask of attributes is not support for the memory resource
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range specified by BaseAddress and Length.
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**/
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EFI_STATUS
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EFIAPI
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SmmSetMemoryAttributes (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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);
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/**
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This function clears the attributes for the memory region specified by BaseAddress and
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Length from their current attributes to the attributes specified by Attributes.
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@param[in] BaseAddress The physical address that is the start address of a memory region.
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@param[in] Length The size in bytes of the memory region.
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@param[in] Attributes The bit mask of attributes to clear for the memory region.
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@retval EFI_SUCCESS The attributes were cleared for the memory region.
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@retval EFI_ACCESS_DENIED The attributes for the memory resource range specified by
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BaseAddress and Length cannot be modified.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of attributes that
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cannot be set together.
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@retval EFI_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of
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the memory resource range.
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@retval EFI_UNSUPPORTED The processor does not support one or more bytes of the memory
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resource range specified by BaseAddress and Length.
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The bit mask of attributes is not support for the memory resource
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range specified by BaseAddress and Length.
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**/
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EFI_STATUS
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EFIAPI
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SmmClearMemoryAttributes (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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);
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/**
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Initialize MP synchronization data.
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@ -749,54 +749,6 @@ PatchSmmSaveStateMap (
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);
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}
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/**
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This function sets GDT/IDT buffer to be RO and XP.
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**/
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VOID
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PatchGdtIdtMap (
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VOID
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)
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{
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EFI_PHYSICAL_ADDRESS BaseAddress;
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UINTN Size;
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//
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// GDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - GDT:\n"));
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BaseAddress = mGdtBuffer;
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Size = ALIGN_VALUE(mGdtBufferSize, SIZE_4KB);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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//
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// IDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - IDT:\n"));
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BaseAddress = gcSmiIdtr.Base;
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Size = ALIGN_VALUE(gcSmiIdtr.Limit + 1, SIZE_4KB);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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}
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/**
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This function sets memory attribute according to MemoryAttributesTable.
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**/
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@ -95,6 +95,54 @@ InitGdt (
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return GdtTssTables;
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}
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/**
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This function sets GDT/IDT buffer to be RO and XP.
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**/
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VOID
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PatchGdtIdtMap (
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VOID
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)
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{
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EFI_PHYSICAL_ADDRESS BaseAddress;
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UINTN Size;
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//
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// GDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - GDT:\n"));
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BaseAddress = mGdtBuffer;
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Size = ALIGN_VALUE(mGdtBufferSize, SIZE_4KB);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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//
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// IDT
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//
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DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - IDT:\n"));
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BaseAddress = gcSmiIdtr.Base;
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Size = ALIGN_VALUE(gcSmiIdtr.Limit + 1, SIZE_4KB);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_RO
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);
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SmmSetMemoryAttributes (
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BaseAddress,
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Size,
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EFI_MEMORY_XP
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);
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}
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/**
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Get Protected mode code segment from current GDT table.
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@ -154,4 +202,3 @@ TransferApToSafeState (
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ASSERT (FALSE);
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}
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