ValidateKernel.c

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#include "ocvalidate.h"
#include "OcValidateLib.h"
#include "KextInfo.h"
 
#include <Library/OcAppleKernelLib.h>
 
STATIC
BOOLEAN
KernelAddHasDuplication (
  IN  CONST VOID  *PrimaryEntry,
  IN  CONST VOID  *SecondaryEntry
  )
{
  CONST OC_KERNEL_ADD_ENTRY  *KernelAddPrimaryEntry;
  CONST OC_KERNEL_ADD_ENTRY  *KernelAddSecondaryEntry;
  CONST CHAR8                *KernelAddPrimaryBundlePathString;
  CONST CHAR8                *KernelAddSecondaryBundlePathString;
 
  KernelAddPrimaryEntry              = *(CONST OC_KERNEL_ADD_ENTRY **)PrimaryEntry;
  KernelAddSecondaryEntry            = *(CONST OC_KERNEL_ADD_ENTRY **)SecondaryEntry;
  KernelAddPrimaryBundlePathString   = OC_BLOB_GET (&KernelAddPrimaryEntry->BundlePath);
  KernelAddSecondaryBundlePathString = OC_BLOB_GET (&KernelAddSecondaryEntry->BundlePath);
 
  if (!KernelAddPrimaryEntry->Enabled || !KernelAddSecondaryEntry->Enabled) {
    return FALSE;
  }
 
  return StringIsDuplicated ("Kernel->Add", KernelAddPrimaryBundlePathString, KernelAddSecondaryBundlePathString);
}
 
STATIC
BOOLEAN
KernelBlockHasDuplication (
  IN  CONST VOID  *PrimaryEntry,
  IN  CONST VOID  *SecondaryEntry
  )
{
  CONST OC_KERNEL_BLOCK_ENTRY  *KernelBlockPrimaryEntry;
  CONST OC_KERNEL_BLOCK_ENTRY  *KernelBlockSecondaryEntry;
  CONST CHAR8                  *KernelBlockPrimaryIdentifierString;
  CONST CHAR8                  *KernelBlockSecondaryIdentifierString;
 
  KernelBlockPrimaryEntry              = *(CONST OC_KERNEL_BLOCK_ENTRY **)PrimaryEntry;
  KernelBlockSecondaryEntry            = *(CONST OC_KERNEL_BLOCK_ENTRY **)SecondaryEntry;
  KernelBlockPrimaryIdentifierString   = OC_BLOB_GET (&KernelBlockPrimaryEntry->Identifier);
  KernelBlockSecondaryIdentifierString = OC_BLOB_GET (&KernelBlockSecondaryEntry->Identifier);
 
  if (!KernelBlockPrimaryEntry->Enabled || !KernelBlockSecondaryEntry->Enabled) {
    return FALSE;
  }
 
  return StringIsDuplicated ("Kernel->Block", KernelBlockPrimaryIdentifierString, KernelBlockSecondaryIdentifierString);
}
 
STATIC
BOOLEAN
KernelForceHasDuplication (
  IN  CONST VOID  *PrimaryEntry,
  IN  CONST VOID  *SecondaryEntry
  )
{
  //
  // NOTE: Add and Force share the same constructor.
  //
  CONST OC_KERNEL_ADD_ENTRY  *KernelForcePrimaryEntry;
  CONST OC_KERNEL_ADD_ENTRY  *KernelForceSecondaryEntry;
  CONST CHAR8                *KernelForcePrimaryBundlePathString;
  CONST CHAR8                *KernelForceSecondaryBundlePathString;
 
  KernelForcePrimaryEntry              = *(CONST OC_KERNEL_ADD_ENTRY **)PrimaryEntry;
  KernelForceSecondaryEntry            = *(CONST OC_KERNEL_ADD_ENTRY **)SecondaryEntry;
  KernelForcePrimaryBundlePathString   = OC_BLOB_GET (&KernelForcePrimaryEntry->BundlePath);
  KernelForceSecondaryBundlePathString = OC_BLOB_GET (&KernelForceSecondaryEntry->BundlePath);
 
  if (!KernelForcePrimaryEntry->Enabled || !KernelForceSecondaryEntry->Enabled) {
    return FALSE;
  }
 
  return StringIsDuplicated ("Kernel->Force", KernelForcePrimaryBundlePathString, KernelForceSecondaryBundlePathString);
}
 
STATIC
UINT32
CheckKernelAdd (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  UINT32       Index;
  CONST CHAR8  *Arch;
  CONST CHAR8  *BundlePath;
  UINTN        BundlePathSumSize;
  CONST CHAR8  *Comment;
  CONST CHAR8  *ExecutablePath;
  UINTN        ExecutableFixedSize;
  UINTN        ExecutablePathSumSize;
  CONST CHAR8  *MaxKernel;
  CONST CHAR8  *MinKernel;
  CONST CHAR8  *PlistPath;
  UINTN        PlistFixedSize;
  UINTN        PlistPathSumSize;
  BOOLEAN      IsLiluUsed;
  BOOLEAN      IsDisableLinkeditJettisonEnabled;
  UINTN        IndexKextInfo;
  UINTN        IndexKextPrecedence;
  BOOLEAN      HasParent;
  CONST CHAR8  *CurrentKext;
  CONST CHAR8  *ParentKext;
  CONST CHAR8  *ChildKext;
 
  ErrorCount = 0;
 
  for (Index = 0; Index < Config->Kernel.Add.Count; ++Index) {
    Arch           = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->Arch);
    BundlePath     = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->BundlePath);
    Comment        = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->Comment);
    ExecutablePath = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->ExecutablePath);
    MaxKernel      = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->MaxKernel);
    MinKernel      = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->MinKernel);
    PlistPath      = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->PlistPath);
 
    //
    // Sanitise strings.
    //
    if (!AsciiArchIsLegal (Arch, FALSE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->Arch is borked (Can only be Any, i386, and x86_64)!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiFileSystemPathIsLegal (BundlePath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->BundlePath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    //
    // Valid BundlePath must contain .kext suffix.
    //
    if (!OcAsciiEndsWith (BundlePath, ".kext", TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->BundlePath does NOT contain .kext suffix!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiCommentIsLegal (Comment)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->Comment contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiFileSystemPathIsLegal (ExecutablePath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->ExecutablePath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    if (!AsciiFileSystemPathIsLegal (PlistPath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->PlistPath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    //
    // Valid PlistPath must contain .plist suffix.
    //
    if (!OcAsciiEndsWith (PlistPath, ".plist", TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->PlistPath does NOT contain .plist suffix!\n", Index));
      ++ErrorCount;
    }
 
    //
    // Check the length of path relative to OC directory.
    //
    BundlePathSumSize = L_STR_LEN (OPEN_CORE_KEXT_PATH) + AsciiStrSize (BundlePath);
    if (BundlePathSumSize > OC_STORAGE_SAFE_PATH_MAX) {
      DEBUG ((
        DEBUG_WARN,
        "Kernel->Add[%u]->BundlePath (length %u) is too long (should not exceed %u)!\n",
        Index,
        AsciiStrLen (BundlePath),
        OC_STORAGE_SAFE_PATH_MAX - L_STR_LEN (OPEN_CORE_KEXT_PATH)
        ));
      ++ErrorCount;
    }
 
    //
    // There is one missing '\\' after the concatenation of BundlePath and ExecutablePath. Append one.
    //
    ExecutableFixedSize   = L_STR_LEN (OPEN_CORE_KEXT_PATH) + AsciiStrLen (BundlePath) + 1;
    ExecutablePathSumSize = ExecutableFixedSize + AsciiStrSize (ExecutablePath);
    if (ExecutablePathSumSize > OC_STORAGE_SAFE_PATH_MAX) {
      DEBUG ((
        DEBUG_WARN,
        "Kernel->Add[%u]->ExecutablePath (length %u) is too long (should not exceed %u)!\n",
        Index,
        AsciiStrLen (ExecutablePath),
        OC_STORAGE_SAFE_PATH_MAX - ExecutableFixedSize
        ));
      ++ErrorCount;
    }
 
    //
    // There is one missing '\\' after the concatenation of BundlePath and PlistPath. Append one.
    //
    PlistFixedSize   = L_STR_LEN (OPEN_CORE_KEXT_PATH) + AsciiStrLen (BundlePath) + 1;
    PlistPathSumSize = PlistFixedSize + AsciiStrSize (PlistPath);
    if (PlistPathSumSize > OC_STORAGE_SAFE_PATH_MAX) {
      DEBUG ((
        DEBUG_WARN,
        "Kernel->Add[%u]->PlistPath (length %u) is too long (should not exceed %u)!\n",
        Index,
        AsciiStrLen (PlistPath),
        OC_STORAGE_SAFE_PATH_MAX - PlistFixedSize
        ));
      ++ErrorCount;
    }
 
    //
    // MinKernel must not be below macOS 10.4 (Darwin version 8).
    //
    if (!OcMatchDarwinVersion (OcParseDarwinVersion (MinKernel), KERNEL_VERSION_TIGER_MIN, 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->MinKernel has a Darwin version %a, which is below 8 (macOS 10.4)!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    //
    // FIXME: Handle correct kernel version checking.
    //
    if ((MaxKernel[0] != '\0') && (OcParseDarwinVersion (MaxKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->MaxKernel (currently set to %a) is borked!\n", Index, MaxKernel));
      ++ErrorCount;
    }
 
    if ((MinKernel[0] != '\0') && (OcParseDarwinVersion (MinKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Add[%u]->MinKernel (currently set to %a) is borked!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    for (IndexKextInfo = 0; IndexKextInfo < mKextInfoSize; ++IndexKextInfo) {
      if (AsciiStrCmp (BundlePath, mKextInfo[IndexKextInfo].KextBundlePath) == 0) {
        //
        // BundlePath matched. Continue checking ExecutablePath and PlistPath.
        //
        if (  (AsciiStrCmp (ExecutablePath, mKextInfo[IndexKextInfo].KextExecutablePath) == 0)
           && (AsciiStrCmp (PlistPath, mKextInfo[IndexKextInfo].KextPlistPath) == 0))
        {
          //
          // Special check for Lilu and Quirks->DisableLinkeditJettison.
          //
          if (IndexKextInfo == INDEX_KEXT_LILU) {
            IsLiluUsed                       = Config->Kernel.Add.Values[Index]->Enabled;
            IsDisableLinkeditJettisonEnabled = Config->Kernel.Quirks.DisableLinkeditJettison;
            if (IsLiluUsed && !IsDisableLinkeditJettisonEnabled) {
              DEBUG ((DEBUG_WARN, "Lilu.kext is loaded at Kernel->Add[%u], but DisableLinkeditJettison is not enabled at Kernel->Quirks!\n", Index));
              ++ErrorCount;
            }
          }
 
          //
          // Special check for BrcmFirmwareRepo, which cannot be injected by OC.
          //
          if (AsciiStrCmp (BundlePath, "BrcmFirmwareRepo.kext") == 0) {
            DEBUG ((DEBUG_WARN, "BrcmFirmwareRepo.kext at Kernel->Add[%u] cannot be injected by OpenCore, please remove it!\n", Index));
            ++ErrorCount;
          }
        } else {
          DEBUG ((
            DEBUG_WARN,
            "Kernel->Add[%u] discovers %a, but its ExecutablePath (%a) or PlistPath (%a) is borked!\n",
            IndexKextInfo,
            BundlePath,
            ExecutablePath,
            PlistPath
            ));
          ++ErrorCount;
        }
      }
    }
  }
 
  //
  // Special checks for kext precedence from Acidanthera.
  //
  for (IndexKextPrecedence = 0; IndexKextPrecedence < mKextPrecedenceSize; ++IndexKextPrecedence) {
    HasParent = FALSE;
 
    for (Index = 0; Index < Config->Kernel.Add.Count; ++Index) {
      CurrentKext = OC_BLOB_GET (&Config->Kernel.Add.Values[Index]->BundlePath);
      ParentKext  = mKextPrecedence[IndexKextPrecedence].Parent;
      ChildKext   = mKextPrecedence[IndexKextPrecedence].Child;
 
      if (AsciiStrCmp (CurrentKext, ParentKext) == 0) {
        HasParent = TRUE;
      } else if (AsciiStrCmp (CurrentKext, ChildKext) == 0) {
        if (!HasParent) {
          DEBUG ((DEBUG_WARN, "Kernel->Add[%u] discovers %a, but its Parent (%a) is either placed after it or is missing!\n", Index, CurrentKext, ParentKext));
          ++ErrorCount;
        }
 
        //
        // Parent is already found before Child as guaranteed by the first if. Done.
        //
        break;
      }
    }
  }
 
  //
  // Check duplicated entries in Kernel->Add.
  //
  ErrorCount += FindArrayDuplication (
                  Config->Kernel.Add.Values,
                  Config->Kernel.Add.Count,
                  sizeof (Config->Kernel.Add.Values[0]),
                  KernelAddHasDuplication
                  );
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelBlock (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  UINT32       Index;
  CONST CHAR8  *Arch;
  CONST CHAR8  *Comment;
  CONST CHAR8  *MaxKernel;
  CONST CHAR8  *MinKernel;
  CONST CHAR8  *Identifier;
  CONST CHAR8  *Strategy;
 
  ErrorCount = 0;
 
  for (Index = 0; Index < Config->Kernel.Block.Count; ++Index) {
    Arch       = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->Arch);
    Comment    = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->Comment);
    Identifier = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->Identifier);
    MaxKernel  = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->MaxKernel);
    MinKernel  = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->MinKernel);
    Strategy   = OC_BLOB_GET (&Config->Kernel.Block.Values[Index]->Strategy);
 
    //
    // Sanitise strings.
    //
    if (!AsciiArchIsLegal (Arch, FALSE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->Arch is borked (Can only be Any, i386, and x86_64)!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiCommentIsLegal (Comment)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->Comment contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiIdentifierIsLegal (Identifier, TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->Identifier contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    //
    // MinKernel must not be below macOS 10.4 (Darwin version 8).
    //
    if (!OcMatchDarwinVersion (OcParseDarwinVersion (MinKernel), KERNEL_VERSION_TIGER_MIN, 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->MinKernel has a Darwin version %a, which is below 8 (macOS 10.4)!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    //
    // FIXME: Handle correct kernel version checking.
    //
    if ((MaxKernel[0] != '\0') && (OcParseDarwinVersion (MaxKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->MaxKernel (currently set to %a) is borked!\n", Index, MaxKernel));
      ++ErrorCount;
    }
 
    if ((MinKernel[0] != '\0') && (OcParseDarwinVersion (MinKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->MinKernel (currently set to %a) is borked!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    if (  (AsciiStrCmp (Strategy, "Disable") != 0)
       && (AsciiStrCmp (Strategy, "Exclude") != 0))
    {
      DEBUG ((DEBUG_WARN, "Kernel->Block[%u]->Strategy is borked (Can only be Disable or Exclude)!\n", Index));
      ++ErrorCount;
    }
  }
 
  //
  // Check duplicated entries in Kernel->Block.
  //
  ErrorCount += FindArrayDuplication (
                  Config->Kernel.Block.Values,
                  Config->Kernel.Block.Count,
                  sizeof (Config->Kernel.Block.Values[0]),
                  KernelBlockHasDuplication
                  );
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelEmulate (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  CONST CHAR8  *MaxKernel;
  CONST CHAR8  *MinKernel;
  BOOLEAN      Result;
 
  ErrorCount = 0;
 
  MaxKernel = OC_BLOB_GET (&Config->Kernel.Emulate.MaxKernel);
  MinKernel = OC_BLOB_GET (&Config->Kernel.Emulate.MinKernel);
 
  //
  // MinKernel must not be below macOS 10.4 (Darwin version 8).
  //
  if (!OcMatchDarwinVersion (OcParseDarwinVersion (MinKernel), KERNEL_VERSION_TIGER_MIN, 0)) {
    DEBUG ((DEBUG_WARN, "Kernel->Emulate->MinKernel has a Darwin version %a, which is below 8 (macOS 10.4)!\n", MinKernel));
    ++ErrorCount;
  }
 
  //
  // FIXME: Handle correct kernel version checking.
  //
  if ((MaxKernel[0] != '\0') && (OcParseDarwinVersion (MaxKernel) == 0)) {
    DEBUG ((DEBUG_WARN, "Kernel->Emulate->MaxKernel (currently set to %a) is borked!\n", MaxKernel));
    ++ErrorCount;
  }
 
  if ((MinKernel[0] != '\0') && (OcParseDarwinVersion (MinKernel) == 0)) {
    DEBUG ((DEBUG_WARN, "Kernel->Emulate->MinKernel (currently set to %a) is borked!\n", MinKernel));
    ++ErrorCount;
  }
 
  Result = DataHasProperMasking (
             Config->Kernel.Emulate.Cpuid1Data,
             Config->Kernel.Emulate.Cpuid1Mask,
             sizeof (Config->Kernel.Emulate.Cpuid1Data),
             sizeof (Config->Kernel.Emulate.Cpuid1Mask)
             );
 
  if (!Result) {
    DEBUG ((DEBUG_WARN, "Kernel->Emulate->Cpuid1Data requires Cpuid1Mask to be active for replaced bits!\n"));
    ++ErrorCount;
  }
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelForce (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  UINT32       Index;
  CONST CHAR8  *Arch;
  CONST CHAR8  *BundlePath;
  CONST CHAR8  *Comment;
  CONST CHAR8  *ExecutablePath;
  CONST CHAR8  *Identifier;
  CONST CHAR8  *MaxKernel;
  CONST CHAR8  *MinKernel;
  CONST CHAR8  *PlistPath;
 
  ErrorCount = 0;
 
  for (Index = 0; Index < Config->Kernel.Force.Count; ++Index) {
    Arch           = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->Arch);
    BundlePath     = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->BundlePath);
    Comment        = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->Comment);
    ExecutablePath = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->ExecutablePath);
    Identifier     = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->Identifier);
    MaxKernel      = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->MaxKernel);
    MinKernel      = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->MinKernel);
    PlistPath      = OC_BLOB_GET (&Config->Kernel.Force.Values[Index]->PlistPath);
 
    //
    // Sanitise strings.
    //
    if (!AsciiArchIsLegal (Arch, FALSE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->Arch is borked (Can only be Any, i386, and x86_64)!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiIdentifierIsLegal (Identifier, TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->Identifier contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiFileSystemPathIsLegal (BundlePath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->BundlePath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    //
    // Valid BundlePath must contain .kext suffix.
    //
    if (!OcAsciiEndsWith (BundlePath, ".kext", TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->BundlePath does NOT contain .kext suffix!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiCommentIsLegal (Comment)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->Comment contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiFileSystemPathIsLegal (ExecutablePath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->ExecutablePath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    if (!AsciiFileSystemPathIsLegal (PlistPath)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->PlistPath contains illegal character!\n", Index));
      ++ErrorCount;
      continue;
    }
 
    //
    // Valid PlistPath must contain .plist suffix.
    //
    if (!OcAsciiEndsWith (PlistPath, ".plist", TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->PlistPath does NOT contain .plist suffix!\n", Index));
      ++ErrorCount;
    }
 
    //
    // MinKernel must not be below macOS 10.4 (Darwin version 8).
    //
    if (!OcMatchDarwinVersion (OcParseDarwinVersion (MinKernel), KERNEL_VERSION_TIGER_MIN, 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->MinKernel has a Darwin version %a, which is below 8 (macOS 10.4)!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    //
    // FIXME: Handle correct kernel version checking.
    //
    if ((MaxKernel[0] != '\0') && (OcParseDarwinVersion (MaxKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->MaxKernel (currently set to %a) is borked!\n", Index, MaxKernel));
      ++ErrorCount;
    }
 
    if ((MinKernel[0] != '\0') && (OcParseDarwinVersion (MinKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Force[%u]->MinKernel (currently set to %a) is borked!\n", Index, MinKernel));
      ++ErrorCount;
    }
  }
 
  //
  // Check duplicated entries in Kernel->Force.
  //
  ErrorCount += FindArrayDuplication (
                  Config->Kernel.Force.Values,
                  Config->Kernel.Force.Count,
                  sizeof (Config->Kernel.Force.Values[0]),
                  KernelForceHasDuplication
                  );
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelPatch (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  UINT32       Index;
  CONST CHAR8  *Arch;
  CONST CHAR8  *Comment;
  CONST CHAR8  *MaxKernel;
  CONST CHAR8  *MinKernel;
  CONST CHAR8  *Identifier;
  CONST CHAR8  *Base;
  CONST UINT8  *Find;
  UINT32       FindSize;
  CONST UINT8  *Replace;
  UINT32       ReplaceSize;
  CONST UINT8  *Mask;
  UINT32       MaskSize;
  CONST UINT8  *ReplaceMask;
  UINT32       ReplaceMaskSize;
 
  ErrorCount = 0;
 
  for (Index = 0; Index < Config->Kernel.Patch.Count; ++Index) {
    Base            = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Base);
    Comment         = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Comment);
    Arch            = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Arch);
    Identifier      = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Identifier);
    Find            = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Find);
    FindSize        = Config->Kernel.Patch.Values[Index]->Find.Size;
    Replace         = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Replace);
    ReplaceSize     = Config->Kernel.Patch.Values[Index]->Replace.Size;
    Mask            = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->Mask);
    MaskSize        = Config->Kernel.Patch.Values[Index]->Mask.Size;
    ReplaceMask     = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->ReplaceMask);
    ReplaceMaskSize = Config->Kernel.Patch.Values[Index]->ReplaceMask.Size;
    MaxKernel       = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->MaxKernel);
    MinKernel       = OC_BLOB_GET (&Config->Kernel.Patch.Values[Index]->MinKernel);
 
    //
    // Sanitise strings.
    //
    if (!AsciiCommentIsLegal (Comment)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->Comment contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiArchIsLegal (Arch, FALSE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->Arch is borked (Can only be Any, i386, and x86_64)!\n", Index));
      ++ErrorCount;
    }
 
    if (!AsciiIdentifierIsLegal (Identifier, TRUE)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->Identifier contains illegal character!\n", Index));
      ++ErrorCount;
    }
 
    //
    // MinKernel must not be below macOS 10.4 (Darwin version 8).
    //
    if (!OcMatchDarwinVersion (OcParseDarwinVersion (MinKernel), KERNEL_VERSION_TIGER_MIN, 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->MinKernel has a Darwin version %a, which is below 8 (macOS 10.4)!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    //
    // FIXME: Handle correct kernel version checking.
    //
    if ((MaxKernel[0] != '\0') && (OcParseDarwinVersion (MaxKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->MaxKernel (currently set to %a) is borked!\n", Index, MaxKernel));
      ++ErrorCount;
    }
 
    if ((MinKernel[0] != '\0') && (OcParseDarwinVersion (MinKernel) == 0)) {
      DEBUG ((DEBUG_WARN, "Kernel->Patch[%u]->MinKernel (currently set to %a) is borked!\n", Index, MinKernel));
      ++ErrorCount;
    }
 
    //
    // Checks for size.
    //
    ErrorCount += ValidatePatch (
                    "Kernel->Patch",
                    Index,
                    Base[0] != '\0' && FindSize == 0,
                    Find,
                    FindSize,
                    Replace,
                    ReplaceSize,
                    Mask,
                    MaskSize,
                    ReplaceMask,
                    ReplaceMaskSize
                    );
  }
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelQuirks (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  BOOLEAN      IsCustomSMBIOSGuidEnabled;
  CONST CHAR8  *UpdateSMBIOSMode;
  INT64        SetApfsTrimTimeout;
 
  ErrorCount = 0;
 
  //
  // CustomSMBIOSGuid quirk requires UpdateSMBIOSMode at PlatformInfo set to Custom.
  //
  IsCustomSMBIOSGuidEnabled = Config->Kernel.Quirks.CustomSmbiosGuid;
  UpdateSMBIOSMode          = OC_BLOB_GET (&Config->PlatformInfo.UpdateSmbiosMode);
  if (IsCustomSMBIOSGuidEnabled && (AsciiStrCmp (UpdateSMBIOSMode, "Custom") != 0)) {
    DEBUG ((DEBUG_WARN, "Kernel->Quirks->CustomSMBIOSGuid is enabled, but PlatformInfo->UpdateSMBIOSMode is not set to Custom!\n"));
    ++ErrorCount;
  }
 
  SetApfsTrimTimeout = Config->Kernel.Quirks.SetApfsTrimTimeout;
  if (  (SetApfsTrimTimeout  > MAX_UINT32)
     || (SetApfsTrimTimeout < -1))
  {
    DEBUG ((DEBUG_WARN, "Kernel->Quirks->SetApfsTrimTimeout is invalid value %d!\n", SetApfsTrimTimeout));
    ++ErrorCount;
  }
 
  return ErrorCount;
}
 
STATIC
UINT32
CheckKernelScheme (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32       ErrorCount;
  CONST CHAR8  *Arch;
  CONST CHAR8  *KernelCache;
 
  ErrorCount = 0;
 
  //
  // Sanitise Kernel->Scheme keys.
  //
  Arch = OC_BLOB_GET (&Config->Kernel.Scheme.KernelArch);
  if (!AsciiArchIsLegal (Arch, TRUE)) {
    DEBUG ((DEBUG_WARN, "Kernel->Scheme->KernelArch is borked (Can only be Auto, i386, i386-user32, or x86_64)!\n"));
    ++ErrorCount;
  }
 
  KernelCache = OC_BLOB_GET (&Config->Kernel.Scheme.KernelCache);
  if (  (AsciiStrCmp (KernelCache, "Auto") != 0)
     && (AsciiStrCmp (KernelCache, "Cacheless") != 0)
     && (AsciiStrCmp (KernelCache, "Mkext") != 0)
     && (AsciiStrCmp (KernelCache, "Prelinked") != 0))
  {
    DEBUG ((DEBUG_WARN, "Kernel->Scheme->KernelCache is borked (Can only be Auto, Cacheless, Mkext, or Prelinked)!\n"));
    ++ErrorCount;
  }
 
  return ErrorCount;
}
 
UINT32
CheckKernel (
  IN  OC_GLOBAL_CONFIG  *Config
  )
{
  UINT32               ErrorCount;
  UINTN                Index;
  STATIC CONFIG_CHECK  KernelCheckers[] = {
    &CheckKernelAdd,
    &CheckKernelBlock,
    &CheckKernelEmulate,
    &CheckKernelForce,
    &CheckKernelPatch,
    &CheckKernelQuirks,
    &CheckKernelScheme
  };
 
  DEBUG ((DEBUG_VERBOSE, "config loaded into %a!\n", __func__));
 
  ErrorCount = 0;
 
  //
  // Ensure correct kext info prior to verification.
  //
  ValidateKextInfo ();
 
  for (Index = 0; Index < ARRAY_SIZE (KernelCheckers); ++Index) {
    ErrorCount += KernelCheckers[Index](Config);
  }
 
  return ReportError (__func__, ErrorCount);
}