87 lines
3.8 KiB
C#
87 lines
3.8 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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// ReSharper disable once CheckNamespace
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namespace VMProtect
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{
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public static class CpuId
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{
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public static int[] Invoke(int level)
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{
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var codePointer = IntPtr.Zero;
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try
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{
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// compile
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byte[] codeBytes;
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if (IntPtr.Size == 4)
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{
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codeBytes = new byte[30];
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codeBytes[0] = 0x55; // push ebp
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codeBytes[1] = 0x8B; codeBytes[2] = 0xEC; // mov ebp,esp
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codeBytes[3] = 0x53; // push ebx
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codeBytes[4] = 0x57; // push edi
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codeBytes[5] = 0x8B; codeBytes[6] = 0x45; codeBytes[7] = 0x08; // mov eax, dword ptr [ebp+8] (move level into eax)
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codeBytes[8] = 0x0F; codeBytes[9] = 0xA2; // cpuid
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codeBytes[10] = 0x8B; codeBytes[11] = 0x7D; codeBytes[12] = 0x0C; // mov edi, dword ptr [ebp+12] (move address of buffer into edi)
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codeBytes[13] = 0x89; codeBytes[14] = 0x07; // mov dword ptr [edi+0], eax (write eax, ... to buffer)
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codeBytes[15] = 0x89; codeBytes[16] = 0x5F; codeBytes[17] = 0x04; // mov dword ptr [edi+4], ebx
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codeBytes[18] = 0x89; codeBytes[19] = 0x4F; codeBytes[20] = 0x08; // mov dword ptr [edi+8], ecx
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codeBytes[21] = 0x89; codeBytes[22] = 0x57; codeBytes[23] = 0x0C; // mov dword ptr [edi+12],edx
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codeBytes[24] = 0x5F; // pop edi
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codeBytes[25] = 0x5B; // pop ebx
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codeBytes[26] = 0x8B; codeBytes[27] = 0xE5; // mov esp,ebp
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codeBytes[28] = 0x5D; // pop ebp
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codeBytes[29] = 0xc3; // ret
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} else
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{
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codeBytes = new byte[26];
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codeBytes[0] = 0x53; // push rbx this gets clobbered by cpuid
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codeBytes[1] = 0x49; codeBytes[2] = 0x89; codeBytes[3] = 0xd0; // mov r8, rdx
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codeBytes[4] = 0x89; codeBytes[5] = 0xc8; // mov eax, ecx
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codeBytes[6] = 0x0F; codeBytes[7] = 0xA2; // cpuid
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codeBytes[8] = 0x41; codeBytes[9] = 0x89; codeBytes[10] = 0x40; codeBytes[11] = 0x00; // mov dword ptr [r8+0], eax
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codeBytes[12] = 0x41; codeBytes[13] = 0x89; codeBytes[14] = 0x58; codeBytes[15] = 0x04; // mov dword ptr [r8+4], ebx
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codeBytes[16] = 0x41; codeBytes[17] = 0x89; codeBytes[18] = 0x48; codeBytes[19] = 0x08; // mov dword ptr [r8+8], ecx
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codeBytes[20] = 0x41; codeBytes[21] = 0x89; codeBytes[22] = 0x50; codeBytes[23] = 0x0c; // mov dword ptr [r8+12], edx
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codeBytes[24] = 0x5b; // pop rbx
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codeBytes[25] = 0xc3; // ret
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}
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codePointer = Win32.VirtualAlloc(
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IntPtr.Zero,
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new UIntPtr((uint)codeBytes.Length),
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Win32.AllocationType.Commit | Win32.AllocationType.Reserve,
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Win32.MemoryProtection.ExecuteReadWrite
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);
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Marshal.Copy(codeBytes, 0, codePointer, codeBytes.Length);
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var cpuIdDelg = (CpuIdDelegate)Marshal.GetDelegateForFunctionPointer(codePointer, typeof(CpuIdDelegate));
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// invoke
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var buffer = new int[4];
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var handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
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try
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{
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cpuIdDelg(level, buffer);
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}
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finally
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{
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handle.Free();
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}
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return buffer;
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}
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finally
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{
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if (codePointer != IntPtr.Zero)
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{
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Win32.VirtualFree(codePointer, UIntPtr.Zero, Win32.FreeType.Release);
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}
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}
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}
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[UnmanagedFunctionPointerAttribute(CallingConvention.Cdecl)]
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private delegate void CpuIdDelegate(int level, int []buffer);
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}
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}
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