internal void Encrypt()
{
Contract.Requires(CurrentState == State.Empty || CurrentState == State.Decrypted);
Contract.Ensures(CurrentState == State.Encrypted);
var aes = new AESManaged();
aes.SetEncryptKey(Owner.Credential.SFSEncryptKey, 128);
Contract.Assert(Arch.ArchDefinition.PageSize % AESManaged.AES_BLOCK_SIZE == 0);
for (int i = 0; i < Arch.ArchDefinition.PageSize / AESManaged.AES_BLOCK_SIZE; ++i)
{
var block = Buffer.Slice(i * AESManaged.AES_BLOCK_SIZE, AESManaged.AES_BLOCK_SIZE);
aes.Encrypt(block, block);
}
CurrentState = State.Encrypted;
}
private int Write(Process process, Pointer dst, int length)
{
var bytesLeft = length;
var src = _value;
var dst_buf = new ByteBufferRef(dst.ToIntPtr(), length);
var cursor = 0;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
{
return(bytesLeft);
}
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
// Page isn't present, try to bring it in.
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, src, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
{
break;
}
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var dst_buf_page = page_buf.Slice(off, bytesTobeCopied);
for (var i = 0; i < bytesTobeCopied; ++i)
{
dst_buf_page.Set(i, dst_buf.Get(cursor + i));
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
cursor += bytesTobeCopied;
}
return(bytesLeft);
}
private static int UnmarshalDataEntries(Thread current, ByteBufferRef buf, ref sys_binder_write_desc desc)
{
var cursor = desc.read_consumed;
var i = 0;
while (i < desc.patch_table_entries && cursor < buf.Length)
{
if (cursor + 2 * sizeof(uint) > buf.Length)
{
return(-1);
}
var offset = Deserializer.ReadUInt(buf, cursor);
cursor += sizeof(uint);
var length = (int)Deserializer.ReadUInt(buf, cursor);
cursor += sizeof(int);
if (cursor + length > buf.Length)
{
return(-1);
}
//Arch.Console.Write("UnmarshalDataEntries: offset=");
//Arch.Console.Write(offset);
//Arch.Console.Write(" length=");
//Arch.Console.Write(length);
//Arch.Console.WriteLine();
//BinderIPCMarshaler.DumpBuf(marshaledPtr, length);
var b = buf.Slice(cursor, length);
if (b.Length + offset > current.Parent.binderVMSize)
{
return(-1);
}
Contract.Assert(offset + b.Length <= current.Parent.binderVMSize);
if ((current.Parent.binderVMStart + offset).Write(current, b) != 0)
{
return(-1);
}
cursor += length;
i++;
}
return(0);
}
public static int UnmarshalReadBuffer(Thread thr, ByteBufferRef completionBuf, ref sys_binder_write_desc desc, UserPtr readBuffer, int readBufferSize)
{
var proc = thr.Parent;
var marshaledPtr = new Pointer(completionBuf.Location);
//Arch.Console.Write("read_consumed:");
//Arch.Console.Write(desc.read_consumed);
//BinderIPCMarshaler.DumpBuf(new Pointer(completionBuf.Location), (int)desc.read_consumed);
if (proc.binderVMStart == UserPtr.Zero)
{
Arch.Console.WriteLine("proc.binderVMStart == UserPtr.Zero");
return(-ErrorCode.EFAULT);
}
if (UnmarshalDataEntries(thr, completionBuf, ref desc) != 0)
{
Arch.Console.WriteLine("UnmarshalDataEntries failed");
return(-ErrorCode.ENOMEM);
}
if (desc.read_consumed > completionBuf.Length)
{
Arch.Console.WriteLine("UnmarshalReadBuffer: bad input");
return(-ErrorCode.ENOMEM);
}
// Patch pointers and convert file descriptors
var b = completionBuf.Slice(0, desc.read_consumed);
if (PatchReadBuffer(thr, b) != 0)
{
Arch.Console.WriteLine("Failed to patch read buffer");
return(-ErrorCode.EINVAL);
}
if (readBuffer.Write(thr, marshaledPtr, desc.read_consumed) != 0)
{
Arch.Console.WriteLine("readBuffer.Write failed");
return(-ErrorCode.ENOMEM);
}
return(0);
}
public static int UnmarshalReadBuffer(Thread thr, ByteBufferRef completionBuf, ref sys_binder_write_desc desc, UserPtr readBuffer, int readBufferSize)
{
var proc = thr.Parent;
var marshaledPtr = new Pointer(completionBuf.Location);
//Arch.Console.Write("read_consumed:");
//Arch.Console.Write(desc.read_consumed);
//BinderIPCMarshaler.DumpBuf(new Pointer(completionBuf.Location), (int)desc.read_consumed);
if (proc.binderVMStart == UserPtr.Zero)
{
Arch.Console.WriteLine("proc.binderVMStart == UserPtr.Zero");
return -ErrorCode.EFAULT;
}
if (UnmarshalDataEntries(thr, completionBuf, ref desc) != 0)
{
Arch.Console.WriteLine("UnmarshalDataEntries failed");
return -ErrorCode.ENOMEM;
}
if (desc.read_consumed > completionBuf.Length)
{
Arch.Console.WriteLine("UnmarshalReadBuffer: bad input");
return -ErrorCode.ENOMEM;
}
// Patch pointers and convert file descriptors
var b = completionBuf.Slice(0, desc.read_consumed);
if (PatchReadBuffer(thr, b) != 0)
{
Arch.Console.WriteLine("Failed to patch read buffer");
return -ErrorCode.EINVAL;
}
if (readBuffer.Write(thr, marshaledPtr, desc.read_consumed) != 0)
{
Arch.Console.WriteLine("readBuffer.Write failed");
return -ErrorCode.ENOMEM;
}
return 0;
}
private int MarshalDataSegments(int size, ref UserPtr data, int offset)
{
Contract.Requires(size >= 0);
Contract.Ensures(ReadCursor == Contract.OldValue(ReadCursor));
if (size == 0)
{
return(0);
}
if (size > buf.Length - WriteCursor)
{
return(-ErrorCode.ENOMEM);
}
var b = buf.Slice(WriteCursor, size);
// Post condition for ByteBufferRef
Contract.Assume(b.Length == size);
var r = data.Read(current, b, size);
if (r != 0)
{
return(-ErrorCode.EFAULT);
}
data = new UserPtr((uint)WriteCursor);
WriteCursor += size;
// Add patch entry
if (CurrentPatchEntry >= kPatchTableSize)
{
return(-ErrorCode.ENOMEM);
}
patchTable[CurrentPatchEntry++] = ReadCursor + offset;
return(0);
}
private int Write(Process process, Pointer dst, int length)
{
var bytesLeft = length;
var src = _value;
var dst_buf = new ByteBufferRef(dst.ToIntPtr(), length);
var cursor = 0;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
{
return bytesLeft;
}
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
// Page isn't present, try to bring it in.
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, src, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
break;
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var dst_buf_page = page_buf.Slice(off, bytesTobeCopied);
for (var i = 0; i < bytesTobeCopied; ++i)
{
dst_buf_page.Set(i, dst_buf.Get(cursor + i));
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
cursor += bytesTobeCopied;
}
return bytesLeft;
}
private int Read(Process process, ByteBufferRef buffer, bool is_string)
{
var bytesLeft = is_string ? buffer.Length - 1 : buffer.Length;
var bytesRead = 0;
var src = _value;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
break;
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, _value, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
break;
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var src_buf = page_buf.Slice(off, bytesTobeCopied);
if (is_string)
{
var res = Util.CopyString(ref buffer, bytesRead, src_buf);
bytesRead += res;
if (res < bytesTobeCopied)
{
// We're done.
break;
}
}
else
{
for (var i = 0; i < bytesTobeCopied; ++i)
{
buffer.Set(i + bytesRead, src_buf.Get(i));
}
bytesRead += bytesTobeCopied;
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
}
if (is_string)
{
buffer.Set(bytesRead, 0);
}
return bytesRead;
}
private int Read(Process process, ByteBufferRef buffer, bool is_string)
{
var bytesLeft = is_string ? buffer.Length - 1 : buffer.Length;
var bytesRead = 0;
var src = _value;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
{
break;
}
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, _value, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
{
break;
}
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var src_buf = page_buf.Slice(off, bytesTobeCopied);
if (is_string)
{
var res = Util.CopyString(ref buffer, bytesRead, src_buf);
bytesRead += res;
if (res < bytesTobeCopied)
{
// We're done.
break;
}
}
else
{
for (var i = 0; i < bytesTobeCopied; ++i)
{
buffer.Set(i + bytesRead, src_buf.Get(i));
}
bytesRead += bytesTobeCopied;
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
}
if (is_string)
{
buffer.Set(bytesRead, 0);
}
return(bytesRead);
}
private static int UnmarshalDataEntries(Thread current, ByteBufferRef buf, ref sys_binder_write_desc desc)
{
var cursor = desc.read_consumed;
var i = 0;
while (i < desc.patch_table_entries && cursor < buf.Length)
{
if (cursor + 2 * sizeof(uint) > buf.Length)
return -1;
var offset = Deserializer.ReadUInt(buf, cursor);
cursor += sizeof(uint);
var length = (int)Deserializer.ReadUInt(buf, cursor);
cursor += sizeof(int);
if (cursor + length > buf.Length)
return -1;
//Arch.Console.Write("UnmarshalDataEntries: offset=");
//Arch.Console.Write(offset);
//Arch.Console.Write(" length=");
//Arch.Console.Write(length);
//Arch.Console.WriteLine();
//BinderIPCMarshaler.DumpBuf(marshaledPtr, length);
var b = buf.Slice(cursor, length);
if ((current.Parent.binderVMStart + offset).Write(current, b) != 0)
return -1;
cursor += length;
i++;
}
return 0;
}