mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-30 12:43:41 +01:00
356 lines
9.5 KiB
C
356 lines
9.5 KiB
C
/** @file
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Copyright (C) 2016, vit9696. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Guid/AppleVariable.h>
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#include <Guid/GlobalVariable.h>
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#include <Guid/MicrosoftVariable.h>
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#include <Guid/OcVariable.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/OcBootManagementLib.h>
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#include <Library/OcMiscLib.h>
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#include <Library/OcStringLib.h>
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#include <Library/PrintLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/UefiLib.h>
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#include <Protocol/OcFirmwareRuntime.h>
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STATIC
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EFI_GUID
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mOzmosisProprietary1Guid = { 0x4D1FDA02, 0x38C7, 0x4A6A, { 0x9C, 0xC6, 0x4B, 0xCC, 0xA8, 0xB3, 0x01, 0x02 } };
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STATIC
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EFI_GUID
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mOzmosisProprietary2Guid = { 0x1F8E0C02, 0x58A9, 0x4E34, { 0xAE, 0x22, 0x2B, 0x63, 0x74, 0x5F, 0xA1, 0x01 } };
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STATIC
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EFI_GUID
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mOzmosisProprietary3Guid = { 0x9480E8A1, 0x1793, 0x46C9, { 0x91, 0xD8, 0x11, 0x08, 0xDB, 0xA4, 0x73, 0x1C } };
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STATIC
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EFI_GUID
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mBootChimeVendorVariableGuid = {0x89D4F995, 0x67E3, 0x4895, { 0x8F, 0x18, 0x45, 0x4B, 0x65, 0x1D, 0x92, 0x15 } };
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STATIC
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BOOLEAN
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IsDeletableVariable (
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IN CHAR16 *Name,
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IN EFI_GUID *Guid
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)
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{
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//
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// Apple GUIDs
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//
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if (CompareGuid (Guid, &gEfiAppleNvramGuid)
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|| CompareGuid (Guid, &gEfiAppleBootGuid)
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|| CompareGuid (Guid, &gAppleCoreStorageVariableGuid)
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|| CompareGuid (Guid, &gAppleTamperResistantBootVariableGuid)
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|| CompareGuid (Guid, &gAppleWirelessNetworkVariableGuid)
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|| CompareGuid (Guid, &gApplePersonalizationVariableGuid)
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|| CompareGuid (Guid, &gAppleNetbootVariableGuid)
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|| CompareGuid (Guid, &gAppleSecureBootVariableGuid)
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|| CompareGuid (Guid, &gAppleTamperResistantBootSecureVariableGuid)
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|| CompareGuid (Guid, &gAppleTamperResistantBootEfiUserVariableGuid)) {
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return TRUE;
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//
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// Global variable boot options
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//
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} else if (CompareGuid (Guid, &gEfiGlobalVariableGuid)) {
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//
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// Only erase boot and driver entries for BDS
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// I.e. BootOrder, Boot####, DriverOrder, Driver####
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//
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if (StrnCmp (Name, L"Boot", StrLen(L"Boot")) == 0
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|| StrnCmp (Name, L"Driver", StrLen(L"Driver")) == 0) {
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return TRUE;
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}
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//
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// Lilu & OpenCore extensions if present
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//
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} else if (CompareGuid (Guid, &gOcVendorVariableGuid)) {
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//
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// Do not remove OpenCore critical variables.
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//
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if (StrCmp (Name, OC_BOOT_REDIRECT_VARIABLE_NAME) != 0
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&& StrCmp (Name, OC_LOAD_POLICY_VARIABLE_NAME) != 0
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&& StrCmp (Name, OC_SCAN_POLICY_VARIABLE_NAME) != 0) {
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return TRUE;
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}
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} else if (CompareGuid (Guid, &gOcReadOnlyVariableGuid)
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|| CompareGuid (Guid, &gOcWriteOnlyVariableGuid)) {
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return TRUE;
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//
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// Ozmozis extensions if present
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//
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} else if (CompareGuid (Guid, &mOzmosisProprietary1Guid)
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|| CompareGuid (Guid, &mOzmosisProprietary2Guid)
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|| CompareGuid (Guid, &mOzmosisProprietary3Guid)) {
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return TRUE;
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//
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// Boot Chime preferences if present
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//
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} else if (CompareGuid (Guid, &mBootChimeVendorVariableGuid)) {
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return TRUE;
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//
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// Microsoft certificates if present
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//
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} else if (CompareGuid (Guid, &gMicrosoftVariableGuid)) {
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//
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// Do not remove current OEM policy.
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//
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if (StrCmp (Name, L"CurrentPolicy") != 0) {
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return TRUE;
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}
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}
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return FALSE;
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}
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STATIC
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VOID
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DeleteVariables (
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VOID
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)
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{
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EFI_GUID CurrentGuid;
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EFI_STATUS Status;
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CHAR16 *Buffer;
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CHAR16 *TmpBuffer;
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UINTN BufferSize;
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UINTN RequestedSize;
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BOOLEAN Restart;
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BOOLEAN CriticalFailure;
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//
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// Request 1024 byte buffer.
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//
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Buffer = NULL;
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BufferSize = 0;
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RequestedSize = 1024;
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//
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// Force starting from 0th GUID.
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//
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Restart = TRUE;
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//
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// Assume we have not failed yet.
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//
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CriticalFailure = FALSE;
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do {
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//
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// Allocate new buffer if needed.
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//
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if (RequestedSize > BufferSize) {
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TmpBuffer = AllocateZeroPool (RequestedSize);
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if (TmpBuffer != NULL) {
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if (Buffer != NULL) {
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CopyMem (TmpBuffer, Buffer, BufferSize);
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FreePool (Buffer);
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}
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Buffer = TmpBuffer;
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BufferSize = RequestedSize;
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} else {
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DEBUG ((
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DEBUG_INFO,
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"OCB: Failed to allocate variable name buffer of %u bytes\n",
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(UINT32)RequestedSize
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));
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break;
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}
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}
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//
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// To start the search variable name should be L"".
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//
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if (Restart) {
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ZeroMem (&CurrentGuid, sizeof (CurrentGuid));
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ZeroMem (Buffer, BufferSize);
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Restart = FALSE;
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}
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//
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// Always pass maximum variable name size to reduce reallocations.
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//
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RequestedSize = BufferSize;
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Status = gRT->GetNextVariableName (&RequestedSize, Buffer, &CurrentGuid);
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if (!EFI_ERROR (Status)) {
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if (IsDeletableVariable (Buffer, &CurrentGuid)) {
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Status = gRT->SetVariable (Buffer, &CurrentGuid, 0, 0, NULL);
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if (!EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_INFO,
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"Deleting %g:%s... OK\n",
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&CurrentGuid,
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Buffer
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));
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//
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// Calls to SetVariable() between calls to GetNextVariableName()
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// may produce unpredictable results, so we restart.
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//
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Restart = TRUE;
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} else if (Status == EFI_NOT_FOUND || Status == EFI_SECURITY_VIOLATION) {
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DEBUG ((
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DEBUG_INFO,
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"Deleting %g:%s... SKIP - %r\n",
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&CurrentGuid,
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Buffer,
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Status
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));
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} else {
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DEBUG ((
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DEBUG_INFO,
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"Deleting %g:%s... FAIL - %r\n",
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&CurrentGuid,
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Buffer,
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Status
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));
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break;
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}
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} else {
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// Print (L"Skipping %g:%s\n", &CurrentGuid, Buffer);
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}
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} else if (Status != EFI_BUFFER_TOO_SMALL && Status != EFI_NOT_FOUND) {
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if (!CriticalFailure) {
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DEBUG ((DEBUG_INFO, "OCB: Unexpected error (%r), trying to rescan\n", Status));
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CriticalFailure = TRUE;
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} else {
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DEBUG ((DEBUG_INFO, "OCB: Unexpected error (%r), aborting\n", Status));
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break;
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}
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}
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} while (Status != EFI_NOT_FOUND);
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if (Buffer != NULL) {
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FreePool (Buffer);
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}
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}
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VOID
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OcDeleteVariables (
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VOID
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)
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{
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EFI_STATUS Status;
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OC_FIRMWARE_RUNTIME_PROTOCOL *FwRuntime;
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OC_FWRT_CONFIG Config;
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UINTN BootProtectSize;
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EFI_GUID *BootProtectGuid;
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UINT32 BootProtect;
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UINT16 BootOrder;
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VOID *BootOption;
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UINTN BootOptionSize;
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DEBUG ((DEBUG_INFO, "OCB: NVRAM cleanup...\n"));
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//
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// Obtain boot protection marker.
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//
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BootProtectSize = sizeof (BootProtect);
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Status = gRT->GetVariable (
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OC_BOOT_PROTECT_VARIABLE_NAME,
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&gOcVendorVariableGuid,
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NULL,
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&BootProtectSize,
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&BootProtect
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);
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if (EFI_ERROR (Status)) {
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BootProtect = 0;
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}
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Status = gBS->LocateProtocol (
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&gOcFirmwareRuntimeProtocolGuid,
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NULL,
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(VOID **) &FwRuntime
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);
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if (!EFI_ERROR (Status) && FwRuntime->Revision == OC_FIRMWARE_RUNTIME_REVISION) {
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ZeroMem (&Config, sizeof (Config));
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FwRuntime->SetOverride (&Config);
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DEBUG ((DEBUG_INFO, "OCB: Found FW NVRAM, full access %d\n", Config.BootVariableRedirect));
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} else {
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FwRuntime = NULL;
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DEBUG ((DEBUG_INFO, "OCB: Missing compatible FW NVRAM, going on...\n"));
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}
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if ((BootProtect & OC_BOOT_PROTECT_VARIABLE_BOOTSTRAP) != 0) {
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BootProtectGuid = (BootProtect & OC_BOOT_PROTECT_VARIABLE_NAMESPACE) != 0 ? &gOcVendorVariableGuid : &gEfiGlobalVariableGuid;
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Status = GetVariable2 (
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OC_BOOT_OPTION_VARIABLE_NAME,
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BootProtectGuid,
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&BootOption,
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&BootOptionSize
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);
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if (!EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_INFO,
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"OCB: Found %g:%s for preservation of %u bytes\n",
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BootProtectGuid,
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OC_BOOT_OPTION_VARIABLE_NAME,
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(UINT32) BootOptionSize
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));
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} else {
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BootProtect = 0;
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}
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}
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DeleteVariables ();
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if ((BootProtect & OC_BOOT_PROTECT_VARIABLE_BOOTSTRAP) != 0) {
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Status = gRT->SetVariable (
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OC_BOOT_OPTION_VARIABLE_NAME,
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BootProtectGuid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
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BootOptionSize,
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BootOption
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);
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BootOrder = OC_BOOT_OPTION;
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if (!EFI_ERROR (Status)) {
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Status = gRT->SetVariable (
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EFI_BOOT_ORDER_VARIABLE_NAME,
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BootProtectGuid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
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sizeof (BootOrder),
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&BootOrder
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);
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}
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DEBUG ((DEBUG_INFO, "OCB: Restored %s - %r\n", OC_BOOT_OPTION_VARIABLE_NAME, Status));
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FreePool (BootOption);
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}
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if (FwRuntime != NULL) {
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DEBUG ((DEBUG_INFO, "OCB: Restoring FW NVRAM...\n"));
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FwRuntime->SetOverride (NULL);
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}
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}
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EFI_STATUS
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InternalSystemActionResetNvram (
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VOID
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)
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{
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OcDeleteVariables ();
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DirectRestCold ();
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return EFI_DEVICE_ERROR;
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}
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