public unsafe void WriteChars_VeryLargeArray_DoesNotOverflow()
{
const nuint INT32_OVERFLOW_SIZE = (nuint)int.MaxValue + 3;
SafeBuffer unmanagedBuffer = null;
try
{
try
{
unmanagedBuffer = SafeBufferUtil.CreateSafeBuffer(INT32_OVERFLOW_SIZE * sizeof(byte));
}
catch (OutOfMemoryException)
{
throw new SkipTestException($"Unable to execute {nameof(WriteChars_VeryLargeArray_DoesNotOverflow)} due to OOM"); // skip test in low-mem conditions
}
Assert.True((long)unmanagedBuffer.ByteLength > int.MaxValue);
// reuse same memory for input and output to avoid allocating more memory and OOMs
Span <char> span = new Span <char>((char *)unmanagedBuffer.DangerousGetHandle(), (int)(INT32_OVERFLOW_SIZE / sizeof(char)));
span.Fill('\u0224'); // LATIN CAPITAL LETTER Z WITH HOOK
Stream outStream = new UnmanagedMemoryStream(unmanagedBuffer, 0, (long)unmanagedBuffer.ByteLength, FileAccess.ReadWrite);
BinaryWriter writer = new BinaryWriter(outStream);
writer.Write(span); // will write slightly more than int.MaxValue bytes to the output
Assert.Equal((long)INT32_OVERFLOW_SIZE, outStream.Position);
}
finally
{
unmanagedBuffer?.Dispose();
}
}
/// <summary>
/// Creates a view of an existing safe buffer.
/// </summary>
/// <param name="buffer">The buffer to create a view on.</param>
/// <param name="offset">The offset from the start of the buffer.</param>
/// <param name="length">The length of the view.</param>
/// <param name="writable">True to make the view writable, false for read-only.</param>
/// <returns>The buffer view.</returns>
/// <remarks>Note that the returned buffer doesn't own the memory, therefore the original buffer
/// must be maintained for the lifetime of this buffer.</remarks>
public static SafeBufferGeneric CreateBufferView(SafeBuffer buffer, long offset, long length, bool writable)
{
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), "Offset less than 0.");
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), "Length less than 0.");
}
long total_length = checked ((long)buffer.ByteLength);
if (length > total_length)
{
throw new ArgumentOutOfRangeException(nameof(length), "Length is greater than the buffer's length.");
}
if (checked (offset + length) > total_length)
{
throw new ArgumentOutOfRangeException("Offset and length is larger than the existing buffer");
}
long base_address = buffer.DangerousGetHandle().ToInt64();
base_address += offset;
return(new SafeBufferView(new IntPtr(base_address), length, writable));
}
/// <summary>
/// Creates a view of an existing safe buffer.
/// </summary>
/// <param name="buffer">The buffer to create a view on.</param>
/// <param name="offset">The offset from the start of the buffer.</param>
/// <param name="length">The length of the view.</param>
/// <returns>The buffer view.</returns>
/// <remarks>Note that the returned buffer doesn't own the memory, therefore the original buffer
/// must be maintained for the lifetime of this buffer.</remarks>
public static SafeBuffer CreateBufferView(SafeBuffer buffer, int offset, int length)
{
long total_length = (long)buffer.ByteLength;
if (offset + length > total_length)
{
throw new ArgumentException("Offset and length is larger than the existing buffer");
}
return(new SafeHGlobalBuffer(buffer.DangerousGetHandle() + offset, length, false));
}
/// <summary>
/// Get a structure buffer at a specific offset.
/// </summary>
/// <typeparam name="T">The type of structure.</typeparam>
/// <param name="buffer">The buffer to map.</param>
/// <param name="offset">The offset into the buffer.</param>
/// <returns>The structure buffer.</returns>
/// <remarks>The returned buffer is not owned, therefore you need to maintain the original buffer while operating on this buffer.</remarks>
public static SafeStructureInOutBuffer <T> GetStructAtOffset <T>(SafeBuffer buffer, int offset) where T : new()
{
int length_left = (int)buffer.ByteLength - offset;
int struct_size = Marshal.SizeOf(typeof(T));
if (length_left < struct_size)
{
throw new ArgumentException("Invalid length for structure");
}
return(new SafeStructureInOutBuffer <T>(buffer.DangerousGetHandle() + offset, length_left, false));
}
private unsafe Span <char> AcquireSpan(ref SafeBuffer?bufferToRelease)
{
SafeBuffer buffer = _buffer !;
bool ignore = false;
buffer.DangerousAddRef(ref ignore);
bufferToRelease = buffer;
return(new Span <char>((byte *)buffer.DangerousGetHandle(), (int)(buffer.ByteLength / 2)));
}
private IReadOnlyCollection <FontFace> CreateFontFaces()
{
var first = MediaResourceManager.Current.CreateFontFaceFromMemory(_buffer.DangerousGetHandle(), _buffer.ByteLength, 0);
var faceCount = first.FaceCount;
var faces = new List <FontFace>((int)faceCount)
{
new FontFace(this, first)
};
for (uint i = 1; i < faceCount; i++)
{
faces.Add(new FontFace(this, MediaResourceManager.Current.CreateFontFaceFromMemory(_buffer.DangerousGetHandle(), _buffer.ByteLength, i)));
}
return(faces);
}
/// <summary>
/// Compare two buffers for equality.
/// </summary>
/// <param name="left">The left buffer.</param>
/// <param name="left_offset">The offset into the left buffer.</param>
/// <param name="right">The right buffer.</param>
/// <param name="right_offset">The offset into the right buffer.</param>
/// <param name="length">The length to compare.</param>
/// <returns>True if the buffers are equal.</returns>
public static bool EqualBuffer(this SafeBuffer left, int left_offset, SafeBuffer right, int right_offset, int length)
{
if (length == 0)
{
return(true);
}
long left_length = left.GetLength();
long right_length = right.GetLength();
if (left_length < (left_offset + length) ||
right_length < (right_offset + length))
{
return(false);
}
IntPtr compare_length = new IntPtr(length);
return(NtRtl.RtlCompareMemory(left.DangerousGetHandle() + left_offset, right.DangerousGetHandle() + right_offset, compare_length) == compare_length);
}
private void NativeFlush()
{
NativeBinding nb;
GetCurrentNativeBinding(out nb);
if (!IsDirty && nb.IsValid)
{
return;
}
ScratchBuffer.Write <T>(0, _ValueContainer.Current);
var pScratch = ScratchBuffer.DangerousGetHandle();
var pUpload = UploadBuffer.DangerousGetHandle();
// Fix-up matrices because the in-memory order is transposed :|
foreach (var fixup in nb.Fixups)
{
var pSource = (pScratch + fixup.FromOffset);
var pDest = (pUpload + fixup.ToOffset);
if (fixup.TransposeMatrix)
{
InPlaceTranspose((float *)pSource);
}
Buffer.MemoryCopy(
pSource.ToPointer(),
pDest.ToPointer(),
fixup.DataSize, fixup.DataSize
);
}
// HACK: Bypass the COM wrapper and invoke directly from the vtable.
var hr = nb.pSetRawValue(nb.pUnboxedEffect, nb.hParameter, pUpload.ToPointer(), 0, nb.UploadSize);
Marshal.ThrowExceptionForHR(hr);
// pEffect.SetRawValue(hParameter, pUpload.ToPointer(), 0, UploadSize);
}
/// <summary>
/// Zero an entire buffer.
/// </summary>
/// <param name="buffer">The buffer to zero.</param>
public static void ZeroBuffer(SafeBuffer buffer)
{
NtRtl.RtlZeroMemory(buffer.DangerousGetHandle(), new IntPtr(buffer.GetLength()));
}
private static string ReadSecurityDescriptorFromAddress(SafeProcessHandle process, IntPtr address)
{
SecurityDescriptorHeader header = process.ReadStruct <SecurityDescriptorHeader>(address);
if (header.Revision != 1)
{
return(String.Empty);
}
ISecurityDescriptor sd = null;
if (header.HasFlag(SecurityDescriptorControl.SelfRelative))
{
sd = process.ReadStruct <SecurityDescriptorRelative>(address);
}
else if (process.Is64Bit)
{
sd = process.ReadStruct <SecurityDescriptorAbsolute>(address);
}
else
{
sd = process.ReadStruct <SecurityDescriptorAbsolute32>(address);
}
SecurityDescriptorAbsolute new_sd = new SecurityDescriptorAbsolute();
new_sd.Header = header;
new_sd.Header.Control = header.Control & ~SecurityDescriptorControl.SelfRelative;
List <SafeBuffer> buffers = new List <SafeBuffer>();
try
{
if (!header.HasFlag(SecurityDescriptorControl.OwnerDefaulted))
{
SafeBuffer buf = ReadSid(process, sd.GetOwner(address));
if (buf != null)
{
buffers.Add(buf);
new_sd.Owner = buf.DangerousGetHandle();
}
}
if (!header.HasFlag(SecurityDescriptorControl.OwnerDefaulted))
{
SafeBuffer buf = ReadSid(process, sd.GetGroup(address));
if (buf != null)
{
buffers.Add(buf);
new_sd.Group = buf.DangerousGetHandle();
}
}
if (header.HasFlag(SecurityDescriptorControl.DaclPresent))
{
SafeBuffer buf = ReadAcl(process, sd.GetDacl(address));
if (buf != null)
{
buffers.Add(buf);
new_sd.Dacl = buf.DangerousGetHandle();
}
}
if (header.HasFlag(SecurityDescriptorControl.SaclPresent))
{
SafeBuffer buf = ReadAcl(process, sd.GetSacl(address));
if (buf != null)
{
buffers.Add(buf);
new_sd.Sacl = buf.DangerousGetHandle();
}
}
IntPtr str;
int length;
if (ConvertSecurityDescriptorToStringSecurityDescriptor(ref new_sd, SDDL_REVISION_1,
SecurityInformation.All, out str, out length))
{
string ret = Marshal.PtrToStringUni(str);
LocalFree(str);
return(ret);
}
}
finally
{
foreach (SafeBuffer buf in buffers)
{
buf.Close();
}
}
return(String.Empty);
}
/// <summary>
/// Split an allocated address into a list of pages. This can be used to pass to
/// ReadScatter or WriteGather file APIs.
/// </summary>
/// <param name="buffer">The allocated buffer to split. The address should be page aligned.</param>
/// <remarks>The buffer will be split up based on its length. Note that the length will be rounded up.</remarks>
/// <returns>The list of pages.</returns>
public static IEnumerable <long> SplitAddressToPages(SafeBuffer buffer)
{
return(SplitAddressToPages(buffer.DangerousGetHandle().ToInt64(), buffer.GetLength()));
}
public override unsafe MemoryHandle Pin(int byteOffset = 0) => new MemoryHandle(this, (byte *)_buffer.DangerousGetHandle() + _offset);
internal static T ReadStruct <T>(this SafeBuffer buffer)
{
return(ReadStruct <T>(buffer.DangerousGetHandle()));
}
/// <summary>
/// Extracts strings from a safe buffer.
/// </summary>
/// <param name="buffer">Safe buffer to extract the value from.</param>
/// <param name="minimum_length">The minimum string length.</param>
/// <param name="type">The type of strings to search for.</param>
/// <param name="count">The length of the data to search.</param>
/// <param name="offset">The offset into the data to search.</param>
/// <returns>The list of extracted strings.</returns>
public static IEnumerable <ExtractedString> Extract(SafeBuffer buffer, int offset, int count, int minimum_length, ExtractedStringType type)
{
return(Extract(new UnmanagedMemoryStream(buffer, offset, count), buffer.DangerousGetHandle().ToInt64() + offset,
minimum_length, type, string.Empty));
}
/// <summary>
/// Fill an entire buffer with a specific byte value.
/// </summary>
/// <param name="buffer">The buffer to full.</param>
/// <param name="fill">The fill value.</param>
public static void FillBuffer(SafeBuffer buffer, byte fill)
{
NtRtl.RtlFillMemory(buffer.DangerousGetHandle(), new IntPtr(buffer.GetLength()), fill);
}
static string GetNameFromSymbolInfo(SafeBuffer buffer)
{
IntPtr ofs = Marshal.OffsetOf(typeof(SYMBOL_INFO), "Name");
return(Marshal.PtrToStringUni(buffer.DangerousGetHandle() + ofs.ToInt32()));
}
/// <summary>
/// Constructor from an unmanged buffer.
/// </summary>
/// <param name="sid">A safe buffer containing a valid SID.</param>
/// <exception cref="NtException">Thrown if the buffer is not valid.</exception>
public Sid(SafeBuffer sid)
: this(sid.DangerousGetHandle())
{
}
static IntPtr GetSafePointer(SafeBuffer buffer)
{
return(buffer != null?buffer.DangerousGetHandle() : IntPtr.Zero);
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="buffer">The safe buffer to print.</param>
/// <param name="length">The length to display.</param>
/// <param name="offset">The offset into the buffer to display.</param>
/// <param name="print_header">Print a header.</param>
/// <param name="print_address">Print the address.</param>
/// <param name="print_ascii">Print the ASCII text.</param>
/// <param name="hide_repeating">Hide repeating lines.</param>
public HexDumpBuilder(SafeBuffer buffer, long offset, long length, bool print_header, bool print_address, bool print_ascii, bool hide_repeating)
: this(new UnmanagedMemoryStream(buffer, offset, length == 0 ? (long)buffer.ByteLength : length),
print_header, print_address, print_ascii, hide_repeating, buffer.DangerousGetHandle().ToInt64())
{
_address_offset = buffer.DangerousGetHandle().ToInt64();
}
public static unsafe Span <byte> AsSpan(this SafeBuffer buffer)
{
return(new Span <byte>(
(void *)buffer.DangerousGetHandle(),
(int)buffer.ByteLength));
}