TestExt4Dxe.c

Go to the documentation of this file.

 
#include <Ext4Dxe.h>
 
#include <UserFile.h>
#include <UserGlobalVar.h>
#include <UserMemory.h>
#include <UserUnicodeCollation.h>
#include <string.h>
 
#define OPEN_FILE_MODES_COUNT  3
 
STATIC UINTN        mFuzzOffset;
STATIC UINTN        mFuzzSize;
STATIC CONST UINT8  *mFuzzPointer;
 
STATIC EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *mEfiSfsInterface;
 
STATIC UINT64  mOpenFileModes[OPEN_FILE_MODES_COUNT] = { EFI_FILE_MODE_READ, EFI_FILE_MODE_WRITE, EFI_FILE_MODE_CREATE };
 
EFI_STATUS
Ext4InitialiseUnicodeCollation (
  EFI_HANDLE  DriverHandle
  )
{
  OcUnicodeCollationInitializeMappingTables ();
  return EFI_SUCCESS;
}
 
INTN
Ext4StrCmpInsensitive (
  IN CHAR16  *Str1,
  IN CHAR16  *Str2
  )
{
  return EngStriColl (NULL, Str1, Str2);
}
 
EFI_STATUS
EFIAPI
EfiLibInstallAllDriverProtocols2 (
  IN CONST EFI_HANDLE ImageHandle,
  IN CONST EFI_SYSTEM_TABLE *SystemTable,
  IN EFI_DRIVER_BINDING_PROTOCOL *DriverBinding,
  IN EFI_HANDLE DriverBindingHandle,
  IN CONST EFI_COMPONENT_NAME_PROTOCOL *ComponentName, OPTIONAL
  IN CONST EFI_COMPONENT_NAME2_PROTOCOL       *ComponentName2, OPTIONAL
  IN CONST EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration, OPTIONAL
  IN CONST EFI_DRIVER_CONFIGURATION2_PROTOCOL *DriverConfiguration2, OPTIONAL
  IN CONST EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics, OPTIONAL
  IN CONST EFI_DRIVER_DIAGNOSTICS2_PROTOCOL   *DriverDiagnostics2    OPTIONAL
  )
{
  abort ();
  return EFI_NOT_FOUND;
}
 
EFI_STATUS
EFIAPI
EfiLibUninstallAllDriverProtocols2 (
  IN EFI_DRIVER_BINDING_PROTOCOL *DriverBinding,
  IN CONST EFI_COMPONENT_NAME_PROTOCOL *ComponentName, OPTIONAL
  IN CONST EFI_COMPONENT_NAME2_PROTOCOL       *ComponentName2, OPTIONAL
  IN CONST EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration, OPTIONAL
  IN CONST EFI_DRIVER_CONFIGURATION2_PROTOCOL *DriverConfiguration2, OPTIONAL
  IN CONST EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics, OPTIONAL
  IN CONST EFI_DRIVER_DIAGNOSTICS2_PROTOCOL   *DriverDiagnostics2    OPTIONAL
  )
{
  abort ();
  return EFI_NOT_FOUND;
}
 
EFI_STATUS
EFIAPI
WrapInstallMultipleProtocolInterfaces (
  IN OUT EFI_HANDLE  *Handle,
  ...
  )
{
  VA_LIST     Args;
  EFI_STATUS  Status;
  EFI_GUID    *Protocol;
  VOID        *Interface;
 
  if (Handle == NULL) {
    return EFI_INVALID_PARAMETER;
  }
 
  VA_START (Args, Handle);
  for (Status = EFI_SUCCESS; !EFI_ERROR (Status);) {
    //
    // If protocol is NULL, then it's the end of the list
    //
    Protocol = VA_ARG (Args, EFI_GUID *);
    if (Protocol == NULL) {
      break;
    }
 
    Interface = VA_ARG (Args, VOID *);
 
    //
    // If this is Sfs protocol then save interface into global state
    //
    if (CompareGuid (Protocol, &gEfiSimpleFileSystemProtocolGuid)) {
      mEfiSfsInterface = Interface;
    }
  }
 
  VA_END (Args);
 
  return Status;
}
 
VOID
FreeAll (
  IN CHAR16          *FileName,
  IN EXT4_PARTITION  *Part
  )
{
  FreePool (FileName);
 
  if (Part != NULL) {
    if (Part->DiskIo != NULL) {
      FreePool (Part->DiskIo);
    }
 
    if (Part->BlockIo != NULL) {
      if (Part->BlockIo->Media != NULL) {
        FreePool (Part->BlockIo->Media);
      }
 
      FreePool (Part->BlockIo);
    }
 
    if (Part->Root != NULL) {
      Ext4UnmountAndFreePartition (Part);
    } else if (Part != NULL) {
      FreePool (Part);
    }
  }
}
 
EFI_STATUS
EFIAPI
FuzzReadDisk (
  IN  EFI_DISK_IO_PROTOCOL  *This,
  IN  UINT32                MediaId,
  IN  UINT64                Offset,
  IN  UINTN                 BufferSize,
  OUT VOID                  *Buffer
  )
{
  if (Buffer == NULL) {
    return EFI_INVALID_PARAMETER;
  }
 
  if ((mFuzzSize - mFuzzOffset) < BufferSize) {
    return EFI_OUT_OF_RESOURCES;
  }
 
  CopyMem (Buffer, mFuzzPointer, BufferSize);
  mFuzzPointer += BufferSize;
  mFuzzOffset  += BufferSize;
 
  return EFI_SUCCESS;
}
 
STATIC
INT32
TestExt4Dxe (
  CONST UINT8  *FuzzData,
  UINTN        FuzzSize
  )
{
  EFI_STATUS             Status;
  EXT4_PARTITION         *Part;
  EXT4_FILE              *File;
  EFI_FILE_PROTOCOL      *This;
  EFI_DISK_IO_PROTOCOL   *DiskIo;
  EFI_BLOCK_IO_PROTOCOL  *BlockIo;
  EFI_HANDLE             DeviceHandle;
  UINTN                  BufferSize;
  VOID                   *Buffer;
  VOID                   *TmpBuffer;
  EFI_FILE_PROTOCOL      *NewHandle;
  CHAR16                 *FileName;
  VOID                   *Info;
  UINTN                  Len;
  UINT64                 Position;
  UINT64                 FileSize;
  UINTN                  Index;
 
  Part       = NULL;
  BufferSize = 100;
 
  mFuzzOffset      = 0;
  mFuzzSize        = FuzzSize;
  mFuzzPointer     = FuzzData;
  mEfiSfsInterface = NULL;
 
  DeviceHandle = (EFI_HANDLE)0xDEADBEAFULL;
 
  //
  // Construct file name
  //
  FileName = AllocateZeroPool (BufferSize);
  if (FileName == NULL) {
    return 0;
  }
 
  ASAN_CHECK_MEMORY_REGION (FileName, BufferSize);
 
  if ((mFuzzSize - mFuzzOffset) < BufferSize) {
    FreePool (FileName);
    return 0;
  }
 
  CopyMem (FileName, mFuzzPointer, BufferSize - 2);
  mFuzzPointer += BufferSize - 2;
  mFuzzOffset  += BufferSize - 2;
 
  //
  // Construct BlockIo and DiskIo interfaces
  //
  DiskIo = AllocateZeroPool (sizeof (EFI_DISK_IO_PROTOCOL));
  if (DiskIo == NULL) {
    FreePool (FileName);
    return 0;
  }
 
  ASAN_CHECK_MEMORY_REGION (DiskIo, sizeof (EFI_DISK_IO_PROTOCOL));
 
  DiskIo->ReadDisk = FuzzReadDisk;
 
  BlockIo = AllocateZeroPool (sizeof (EFI_BLOCK_IO_PROTOCOL));
  if (BlockIo == NULL) {
    FreePool (FileName);
    FreePool (DiskIo);
    return 0;
  }
 
  ASAN_CHECK_MEMORY_REGION (BlockIo, sizeof (EFI_BLOCK_IO_PROTOCOL));
 
  BlockIo->Media = AllocateZeroPool (sizeof (EFI_BLOCK_IO_MEDIA));
  if (BlockIo->Media == NULL) {
    FreePool (FileName);
    FreePool (DiskIo);
    FreePool (BlockIo);
    return 0;
  }
 
  ASAN_CHECK_MEMORY_REGION (BlockIo->Media, sizeof (EFI_BLOCK_IO_MEDIA));
 
  //
  // Check Ext4 SuperBlock magic like it done
  // in Ext4IsBindingSupported routine
  //
  if (!Ext4SuperblockCheckMagic (DiskIo, BlockIo)) {
    // Don't halt on bad magic, just keep going
    DEBUG ((DEBUG_WARN, "[ext4] Superblock contains bad magic \n"));
  }
 
  //
  // Open partition
  //
  Status = Ext4OpenPartition (DeviceHandle, DiskIo, NULL, BlockIo);
 
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "[ext4] Error mounting: %r\n", Status));
    FreePool (FileName);
    FreePool (BlockIo->Media);
    FreePool (BlockIo);
    FreePool (DiskIo);
    return 0;
  }
 
  Part = (EXT4_PARTITION *)mEfiSfsInterface;
 
  ASAN_CHECK_MEMORY_REGION (Part, sizeof (EXT4_PARTITION));
 
  This = (EFI_FILE_PROTOCOL *)Part->Root;
 
  //
  // Test Ext4Dxe driver
  //
  for (Index = 0; Index < OPEN_FILE_MODES_COUNT; Index++) {
    Status = Ext4Open (This, &NewHandle, FileName, mOpenFileModes[Index], 0);
    if (Status == EFI_SUCCESS) {
      //
      // Try to read 100 bytes
      //
      Buffer     = AllocateZeroPool (100);
      BufferSize = 100;
      if (Buffer == NULL) {
        FreeAll (FileName, Part);
        return 0;
      }
 
      Status = Ext4ReadFile (NewHandle, &BufferSize, Buffer);
      if (Status == EFI_BUFFER_TOO_SMALL) {
        TmpBuffer = ReallocatePool (100, BufferSize, Buffer);
        if (TmpBuffer == NULL) {
          FreePool (Buffer);
          FreeAll (FileName, Part);
          return 0;
        }
 
        Buffer = TmpBuffer;
 
        ASAN_CHECK_MEMORY_REGION (Buffer, BufferSize);
 
        Ext4ReadFile (NewHandle, &BufferSize, Buffer);
      }
 
      Ext4WriteFile (NewHandle, &BufferSize, Buffer);
 
      FreePool (Buffer);
 
      Len    = 0;
      Info   = NULL;
      Status = Ext4GetInfo (NewHandle, &gEfiFileInfoGuid, &Len, Info);
      if (Status == EFI_BUFFER_TOO_SMALL) {
        Info = AllocateZeroPool (Len);
        if (Info == NULL) {
          FreeAll (FileName, Part);
          return 0;
        }
 
        Ext4GetInfo (NewHandle, &gEfiFileInfoGuid, &Len, Info);
        FreePool (Info);
      }
 
      Len    = 0;
      Status = Ext4GetInfo (NewHandle, &gEfiFileSystemInfoGuid, &Len, Info);
      if (Status == EFI_BUFFER_TOO_SMALL) {
        Info = AllocateZeroPool (Len);
        if (Info == NULL) {
          FreeAll (FileName, Part);
          return 0;
        }
 
        Ext4GetInfo (NewHandle, &gEfiFileSystemInfoGuid, &Len, Info);
        FreePool (Info);
      }
 
      Len    = 0;
      Status = Ext4GetInfo (NewHandle, &gEfiFileSystemVolumeLabelInfoIdGuid, &Len, Info);
      if (Status == EFI_BUFFER_TOO_SMALL) {
        Info = AllocateZeroPool (Len);
        if (Info == NULL) {
          FreeAll (FileName, Part);
          return 0;
        }
 
        Ext4GetInfo (NewHandle, &gEfiFileSystemVolumeLabelInfoIdGuid, &Len, Info);
        FreePool (Info);
      }
 
      Ext4SetInfo (NewHandle, &gEfiFileSystemVolumeLabelInfoIdGuid, Len, Info);
 
      //
      // Test position functions
      //
      Ext4GetPosition (NewHandle, &Position);
      Ext4SetPosition (NewHandle, Position);
 
      //
      // Trying to reach the end of file and read/write it
      //
      Position = (UINT64)-1;
      Status   = Ext4SetPosition (NewHandle, Position);
      if (!EFI_ERROR (Status)) {
        Buffer     = AllocateZeroPool (100);
        BufferSize = 100;
        if (Buffer == NULL) {
          FreeAll (FileName, Part);
          return 0;
        }
 
        Status = Ext4ReadFile (NewHandle, &BufferSize, Buffer);
        if (Status == EFI_BUFFER_TOO_SMALL) {
          TmpBuffer = ReallocatePool (100, BufferSize, Buffer);
          if (TmpBuffer == NULL) {
            FreePool (Buffer);
            FreeAll (FileName, Part);
            return 0;
          }
 
          Buffer = TmpBuffer;
 
          ASAN_CHECK_MEMORY_REGION (Buffer, BufferSize);
 
          Ext4ReadFile (NewHandle, &BufferSize, Buffer);
        }
 
        Ext4WriteFile (NewHandle, &BufferSize, Buffer);
 
        FreePool (Buffer);
      }
 
      //
      // Trying to reach out of bound of FileSize
      //
      File     = EXT4_FILE_FROM_THIS (NewHandle);
      FileSize = EXT4_INODE_SIZE (File->Inode);
      if (FileSize < (UINT64)-1 - 1) {
        Position = FileSize + 1;
        Status   = Ext4SetPosition (NewHandle, Position);
        if (!EFI_ERROR (Status)) {
          Buffer     = AllocateZeroPool (100);
          BufferSize = 100;
          if (Buffer == NULL) {
            FreeAll (FileName, Part);
            return 0;
          }
 
          Status = Ext4ReadFile (NewHandle, &BufferSize, Buffer);
 
          ASSERT (Status == EFI_DEVICE_ERROR);
          FreePool (Buffer);
        }
      }
 
      Ext4Delete (NewHandle);
    }
  }
 
  FreeAll (FileName, Part);
 
  return 0;
}
 
INT32
LLVMFuzzerTestOneInput (
  CONST UINT8  *FuzzData,
  UINTN        FuzzSize
  )
{
  VOID    *NewData;
  UINT32  ConfigSize;
 
  if (FuzzSize == 0) {
    return 0;
  }
 
  //
  // Override InstallMultipleProtocolInterfaces with custom wrapper
  //
  gBS->InstallMultipleProtocolInterfaces = WrapInstallMultipleProtocolInterfaces;
 
  ConfigSize = 0;
  ConfigureMemoryAllocations (FuzzData, FuzzSize, &ConfigSize);
  SetPoolAllocationSizeLimit (BASE_1GB | BASE_2GB);
 
  NewData = AllocatePool (FuzzSize);
  if (NewData != NULL) {
    CopyMem (NewData, FuzzData, FuzzSize);
    TestExt4Dxe (NewData, FuzzSize);
    FreePool (NewData);
  }
 
  DEBUG ((
    DEBUG_POOL | DEBUG_PAGE,
    "UMEM: Allocated %u pools %u pages\n",
    (UINT32)mPoolAllocations,
    (UINT32)mPageAllocations
    ));
 
  return 0;
}
 
int
ENTRY_POINT (
  int   argc,
  char  **argv
  )
{
  uint32_t  f;
  uint8_t   *b;
 
  if ((b = UserReadFile ((argc > 1) ? argv[1] : "in.bin", &f)) == NULL) {
    DEBUG ((DEBUG_ERROR, "Read fail\n"));
    return -1;
  }
 
  LLVMFuzzerTestOneInput (b, f);
  FreePool (b);
  return 0;
}