OpenCorePkg/Library/OcBootManagementLib/BootEntryManagement.c

/** @file
  Copyright (C) 2019, vit9696. All rights reserved.

  All rights reserved.

  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/

#include "BootManagementInternal.h"

#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/OcDebugLogLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/OcBootManagementLib.h>
#include <Library/OcDevicePathLib.h>
#include <Library/OcFileLib.h>
#include <Library/OcStringLib.h>
#include <Library/UefiBootServicesTableLib.h>

EFI_STATUS
OcDescribeBootEntry (
  IN     APPLE_BOOT_POLICY_PROTOCOL *BootPolicy,
  IN OUT OC_BOOT_ENTRY              *BootEntry
  )
{
  EFI_STATUS                       Status;
  CHAR16                           *BootDirectoryName;
  CHAR16                           *RecoveryBootName;
  EFI_HANDLE                       Device;
  EFI_HANDLE                       ApfsVolumeHandle;
  UINT32                           BcdSize;
  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *FileSystem;

  //
  // Custom entries need no special description.
  //
  if (BootEntry->Type == OcBootCustom) {
    return EFI_SUCCESS;
  }

  Status = BootPolicy->DevicePathToDirPath (
    BootEntry->DevicePath,
    &BootDirectoryName,
    &Device,
    &ApfsVolumeHandle
    );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->HandleProtocol (
    Device,
    &gEfiSimpleFileSystemProtocolGuid,
    (VOID **) &FileSystem
    );

  if (EFI_ERROR (Status)) {
    FreePool (BootDirectoryName);
    return Status;
  }

  //
  // Try to use APFS-style label or legacy HFS one.
  //
  BootEntry->Name = InternalGetAppleDiskLabel (FileSystem, BootDirectoryName, L".contentDetails");
  if (BootEntry->Name == NULL) {
    BootEntry->Name = InternalGetAppleDiskLabel (FileSystem, BootDirectoryName, L".disk_label.contentDetails");
  }

  //
  // With FV2 encryption on HFS+ the actual boot happens from "Recovery HD/S/L/CoreServices".
  // For some reason "Recovery HD/S/L/CoreServices/.disk_label" may not get updated immediately,
  // and will contain "Recovery HD" despite actually pointing to "Macintosh HD".
  // This also spontaneously happens with renamed APFS volumes. The workaround is to manually
  // edit the file or sometimes choose the boot volume once more in preferences.
  //
  // TODO: Bugreport this to Apple, as this is clearly their bug, which should be reproducible
  // on original hardware.
  //
  // There exists .root_uuid, which contains real partition UUID in ASCII, however, Apple
  // BootPicker only uses it for entry deduplication, and we cannot figure out the name
  // on an encrypted volume anyway.
  //

  //
  // Windows boot entry may have a custom name, so ensure OcBootWindows is set correctly.
  //
  if (BootEntry->Type == OcBootUnknown) {
    DEBUG ((DEBUG_INFO, "Trying to detect Microsoft BCD\n"));
    Status = ReadFileSize (FileSystem, L"\\EFI\\Microsoft\\Boot\\BCD", &BcdSize);
    if (!EFI_ERROR (Status)) {
      BootEntry->Type = OcBootWindows;
      if (BootEntry->Name == NULL) {
        BootEntry->Name = AllocateCopyPool (sizeof (L"BOOTCAMP Windows"), L"BOOTCAMP Windows");
      }
    }
  }

  if (BootEntry->Name == NULL) {
    BootEntry->Name = GetVolumeLabel (FileSystem);
    if (BootEntry->Name != NULL
      && (!StrCmp (BootEntry->Name, L"Recovery HD")
       || !StrCmp (BootEntry->Name, L"Recovery"))) {
      if (BootEntry->Type == OcBootUnknown || BootEntry->Type == OcBootApple) {
        BootEntry->Type = OcBootAppleRecovery;
      }
      RecoveryBootName = InternalGetAppleRecoveryName (FileSystem, BootDirectoryName);
      if (RecoveryBootName != NULL) {
        FreePool (BootEntry->Name);
        BootEntry->Name = RecoveryBootName;
      }
    }
  }

  if (BootEntry->Name == NULL) {
    FreePool (BootDirectoryName);
    return EFI_NOT_FOUND;
  }

  BootEntry->PathName = BootDirectoryName;

  return EFI_SUCCESS;
}

VOID
OcResetBootEntry (
  IN OUT OC_BOOT_ENTRY              *BootEntry
  )
{
  if (BootEntry->DevicePath != NULL) {
    FreePool (BootEntry->DevicePath);
    BootEntry->DevicePath = NULL;
  }

  if (BootEntry->Name != NULL) {
    FreePool (BootEntry->Name);
    BootEntry->Name = NULL;
  }

  if (BootEntry->PathName != NULL) {
    FreePool (BootEntry->PathName);
    BootEntry->PathName = NULL;
  }

  if (BootEntry->LoadOptions != NULL) {
    FreePool (BootEntry->LoadOptions);
    BootEntry->LoadOptions     = NULL;
    BootEntry->LoadOptionsSize = 0;
  }
}

VOID
OcFreeBootEntries (
  IN OUT OC_BOOT_ENTRY              *BootEntries,
  IN     UINTN                      Count
  )
{
  UINTN  Index;

  for (Index = 0; Index < Count; ++Index) {
    OcResetBootEntry (&BootEntries[Index]);
  }

  FreePool (BootEntries);
}

EFI_STATUS
OcScanForBootEntries (
  IN  APPLE_BOOT_POLICY_PROTOCOL  *BootPolicy,
  IN  OC_PICKER_CONTEXT           *Context,
  OUT OC_BOOT_ENTRY               **BootEntries,
  OUT UINTN                       *Count,
  OUT UINTN                       *AllocCount OPTIONAL,
  IN  BOOLEAN                     Describe
  )
{
  EFI_STATUS                       Status;
  BOOLEAN                          Result;

  UINTN                            NoHandles;
  EFI_HANDLE                       *Handles;
  UINTN                            Index;
  OC_BOOT_ENTRY                    *Entries;
  UINTN                            EntriesSize;
  UINTN                            EntryIndex;
  CHAR16                           *PathName;
  CHAR16                           *DevicePathText;

  UINTN                            DevPathScanInfoSize;
  INTERNAL_DEV_PATH_SCAN_INFO      *DevPathScanInfo;
  INTERNAL_DEV_PATH_SCAN_INFO      *DevPathScanInfos;
  EFI_DEVICE_PATH_PROTOCOL         *DevicePathWalker;
  CONST FILEPATH_DEVICE_PATH       *FilePath;

  Result = OcOverflowMulUN (Context->AllCustomEntryCount, sizeof (OC_BOOT_ENTRY), &EntriesSize);
  if (Result) {
    return EFI_OUT_OF_RESOURCES;
  }

  if (Context->ShowNvramReset && !Context->HideAuxiliary) {
    Result = OcOverflowAddUN (EntriesSize, sizeof (OC_BOOT_ENTRY), &EntriesSize);
    if (Result) {
      return EFI_OUT_OF_RESOURCES;
    }
  }

  Status = gBS->LocateHandleBuffer (
    ByProtocol,
    &gEfiSimpleFileSystemProtocolGuid,
    NULL,
    &NoHandles,
    &Handles
    );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  DEBUG ((DEBUG_INFO, "OCB: Found %u potentially bootable filesystems\n", (UINT32) NoHandles));

  if (NoHandles == 0) {
    FreePool (Handles);
    return EFI_NOT_FOUND;
  }

  Result = OcOverflowMulUN (
             NoHandles,
             sizeof (*DevPathScanInfos),
             &DevPathScanInfoSize
             );
  if (Result) {
    FreePool (Handles);
    return EFI_OUT_OF_RESOURCES;
  }

  DevPathScanInfos = AllocateZeroPool (DevPathScanInfoSize);
  if (DevPathScanInfos == NULL) {
    FreePool (Handles);
    return EFI_OUT_OF_RESOURCES;
  }

  for (Index = 0; Index < NoHandles; ++Index) {
    DevPathScanInfo = &DevPathScanInfos[Index];

    Status = InternalPrepareScanInfo (
      BootPolicy,
      Context,
      Handles,
      Index,
      DevPathScanInfo
      );

    if (EFI_ERROR (Status)) {
      continue;
    }

    ASSERT (DevPathScanInfo->NumBootInstances > 0);

    Result = OcOverflowMulAddUN (
      DevPathScanInfo->NumBootInstances,
      2 * sizeof (OC_BOOT_ENTRY),
      EntriesSize,
      &EntriesSize
      );
    if (Result) {
      FreePool (Handles);
      FreePool (DevPathScanInfos);
      return EFI_OUT_OF_RESOURCES;
    }
  }
  //
  // Errors from within the loop are not fatal.
  //
  Status = EFI_SUCCESS;

  FreePool (Handles);

  if (EntriesSize == 0) {
    FreePool (DevPathScanInfos);
    return EFI_NOT_FOUND;
  }

  Entries = AllocateZeroPool (EntriesSize);
  if (Entries == NULL) {
    FreePool (DevPathScanInfos);
    return EFI_OUT_OF_RESOURCES;
  }

  EntryIndex = 0;
  for (Index = 0; Index < NoHandles; ++Index) {
    DevPathScanInfo = &DevPathScanInfos[Index];

    DevicePathWalker = DevPathScanInfo->BootDevicePath;
    if (DevicePathWalker == NULL) {
      continue;
    }

    EntryIndex = InternalFillValidBootEntries (
      BootPolicy,
      Context,
      DevPathScanInfo,
      DevicePathWalker,
      Entries,
      EntryIndex
      );

    FreePool (DevPathScanInfo->BootDevicePath);
  }

  FreePool (DevPathScanInfos);

  if (Describe) {
    DEBUG ((DEBUG_INFO, "OCB: Scanning got %u entries\n", (UINT32) EntryIndex));

    for (Index = 0; Index < EntryIndex; ++Index) {
      Status = OcDescribeBootEntry (BootPolicy, &Entries[Index]);
      if (EFI_ERROR (Status)) {
        break;
      }

      DEBUG_CODE_BEGIN ();
      DEBUG ((
        DEBUG_INFO,
        "OCB: Entry %u is %s at %s (T:%d|F:%d)\n",
        (UINT32) Index,
        Entries[Index].Name,
        Entries[Index].PathName,
        Entries[Index].Type,
        Entries[Index].IsFolder
        ));

      DevicePathText = ConvertDevicePathToText (Entries[Index].DevicePath, FALSE, FALSE);
      if (DevicePathText != NULL) {
        DEBUG ((
          DEBUG_INFO,
          "OCB: Entry %u is %s at dp %s\n",
          (UINT32) Index,
          Entries[Index].Name,
          DevicePathText
          ));
        FreePool (DevicePathText);
      }
      DEBUG_CODE_END ();
    }

    if (EFI_ERROR (Status)) {
      OcFreeBootEntries (Entries, EntryIndex);
      return Status;
    }
  }

  for (Index = 0; Index < Context->AllCustomEntryCount; ++Index) {
    if (Context->CustomEntries[Index].Auxiliary && Context->HideAuxiliary) {
      continue;
    }

    Entries[EntryIndex].Name = AsciiStrCopyToUnicode (Context->CustomEntries[Index].Name, 0);
    PathName                 = AsciiStrCopyToUnicode (Context->CustomEntries[Index].Path, 0);
    if (Entries[EntryIndex].Name == NULL || PathName == NULL) {
      OcFreeBootEntries (Entries, EntryIndex + 1);
      return EFI_OUT_OF_RESOURCES;
    }

    Entries[EntryIndex].Type = OcBootCustom;

    if (Index < Context->AbsoluteEntryCount) {
      DEBUG ((
        DEBUG_INFO,
        "OCB: Custom entry %u is %a\n",
        (UINT32) EntryIndex,
        Entries[EntryIndex].Name
        ));

      Entries[EntryIndex].DevicePath = ConvertTextToDevicePath (PathName);
      FreePool (PathName);
      if (Entries[EntryIndex].DevicePath == NULL) {
        FreePool (Entries[EntryIndex].Name);
        continue;
      }

      FilePath = (FILEPATH_DEVICE_PATH *)(
                   FindDevicePathNodeWithType (
                     Entries[EntryIndex].DevicePath,
                     MEDIA_DEVICE_PATH,
                     MEDIA_FILEPATH_DP
                     )
                   );
      if (FilePath == NULL) {
        FreePool (Entries[EntryIndex].Name);
        FreePool (Entries[EntryIndex].DevicePath);
        continue;
      }

      Entries[EntryIndex].PathName = AllocateCopyPool (
                                       OcFileDevicePathNameSize (FilePath),
                                       FilePath->PathName
                                       );
      if (Entries[EntryIndex].PathName == NULL) {
        FreePool (Entries[EntryIndex].Name);
        FreePool (Entries[EntryIndex].DevicePath);
        continue;
      }
    } else {
      UnicodeUefiSlashes (PathName);
      Entries[EntryIndex].PathName = PathName;
    }

    Entries[EntryIndex].LoadOptionsSize = (UINT32) AsciiStrLen (Context->CustomEntries[Index].Arguments);
    if (Entries[EntryIndex].LoadOptionsSize > 0) {
      Entries[EntryIndex].LoadOptions = AllocateCopyPool (
        Entries[EntryIndex].LoadOptionsSize + 1,
        Context->CustomEntries[Index].Arguments
        );
      if (Entries[EntryIndex].LoadOptions == NULL) {
        Entries[EntryIndex].LoadOptionsSize = 0;
      }
    }

    ++EntryIndex;
  }

  if (Context->ShowNvramReset && !Context->HideAuxiliary) {
    Entries[EntryIndex].Name = AllocateCopyPool (
      L_STR_SIZE (OC_MENU_RESET_NVRAM_ENTRY),
      OC_MENU_RESET_NVRAM_ENTRY
      );
    if (Entries[EntryIndex].Name == NULL) {
      OcFreeBootEntries (Entries, EntryIndex + 1);
      return EFI_OUT_OF_RESOURCES;
    }

    Entries[EntryIndex].Type         = OcBootSystem;
    Entries[EntryIndex].SystemAction = InternalSystemActionResetNvram;
    ++EntryIndex;
  }

  *BootEntries = Entries;
  *Count       = EntryIndex;

  ASSERT (*Count <= EntriesSize / sizeof (OC_BOOT_ENTRY));

  if (AllocCount != NULL) {
    *AllocCount = EntriesSize / sizeof (OC_BOOT_ENTRY);
  }

  return EFI_SUCCESS;
}

EFI_STATUS
OcLoadBootEntry (
  IN  APPLE_BOOT_POLICY_PROTOCOL  *BootPolicy,
  IN  OC_PICKER_CONTEXT           *Context,
  IN  OC_BOOT_ENTRY               *BootEntry,
  IN  EFI_HANDLE                  ParentHandle
  )
{
  EFI_STATUS                 Status;
  EFI_HANDLE                 EntryHandle;
  INTERNAL_DMG_LOAD_CONTEXT  DmgLoadContext;

  if (BootEntry->Type == OcBootSystem) {
    ASSERT (BootEntry->SystemAction != NULL);
    return BootEntry->SystemAction ();
  }

  Status = InternalLoadBootEntry (
    BootPolicy,
    Context,
    BootEntry,
    ParentHandle,
    &EntryHandle,
    &DmgLoadContext
    );
  if (!EFI_ERROR (Status)) {
    Status = Context->StartImage (BootEntry, EntryHandle, NULL, NULL);
    if (EFI_ERROR (Status)) {
      DEBUG ((DEBUG_ERROR, "OCB: StartImage failed - %r\n", Status));
      //
      // Unload dmg if any.
      //
      InternalUnloadDmg (&DmgLoadContext);
    }
  } else {
    DEBUG ((DEBUG_ERROR, "OCB: LoadImage failed - %r\n", Status));
  }

  return Status;
}