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UefiCpuPkg: Fixed stack corruption.

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This commit is contained in:
Mikhail Krichanov 2025-03-04 16:48:34 +03:00
parent b3bf2495f3
commit 2068113e8b
1 changed files with 10 additions and 7 deletions
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17
UefiCpuPkg/Library/CpuArchLib/CpuMp.c
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@ -659,6 +659,7 @@ InitializeMpExceptionStackSwitchHandlers (
UINTN BufferSize;
EFI_STATUS Status;
UINT8 *Buffer;
EFI_PHYSICAL_ADDRESS BufferAddress;
SwitchStackData = AllocateZeroPool (mNumberOfProcessors * sizeof (EXCEPTION_STACK_SWITCH_CONTEXT));
if (SwitchStackData == NULL) {
@ -697,19 +698,21 @@ InitializeMpExceptionStackSwitchHandlers (
// we are allocating the buffer that will hold the new GDT and IDT for the APs. These must be allocated below
// 4GB as they are used by protected mode code on the APs when they are started up after this point. If they are
// above 4GB, the APs will triple fault because the 32 bit code segment is invalid
Buffer = (UINT8 *)(UINTN)(BASE_4GB - 1);
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiRuntimeServicesData,
EFI_SIZE_TO_PAGES (BufferSize),
(EFI_PHYSICAL_ADDRESS *)&Buffer
);
BufferAddress = BASE_4GB - 1;
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiRuntimeServicesData,
EFI_SIZE_TO_PAGES (BufferSize),
&BufferAddress
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Failed to allocate buffer for InitializeExceptionStackSwitchHandlers Status %r\n", Status));
ASSERT_EFI_ERROR (Status);
goto Exit;
}
Buffer = (UINT8 *)(UINTN)BufferAddress;
ZeroMem (Buffer, BufferSize);
BufferSize = 0;