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POHow do I patch a Windows API at runtime so that it to returns 0 in x64?
 

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  1. POHow do I patch a Windows API at runtime so that it to returns 0 in x64?
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    <p>In x86, I get the function address using <code>GetProcAddress()</code> and write a simple <code>XOR EAX,EAX; RET 4;</code> in it. Simple and effective. How do I do the same in x64?</p> <pre><code>bool DisableSetUnhandledExceptionFilter() { const BYTE PatchBytes[5] = { 0x33, 0xC0, 0xC2, 0x04, 0x00 }; // XOR EAX,EAX; RET 4; // Obtain the address of SetUnhandledExceptionFilter HMODULE hLib = GetModuleHandle( _T("kernel32.dll") ); if( hLib == NULL ) return false; BYTE* pTarget = (BYTE*)GetProcAddress( hLib, "SetUnhandledExceptionFilter" ); if( pTarget == 0 ) return false; // Patch SetUnhandledExceptionFilter if( !WriteMemory( pTarget, PatchBytes, sizeof(PatchBytes) ) ) return false; // Ensures out of cache FlushInstructionCache(GetCurrentProcess(), pTarget, sizeof(PatchBytes)); // Success return true; } static bool WriteMemory( BYTE* pTarget, const BYTE* pSource, DWORD Size ) { // Check parameters if( pTarget == 0 ) return false; if( pSource == 0 ) return false; if( Size == 0 ) return false; if( IsBadReadPtr( pSource, Size ) ) return false; // Modify protection attributes of the target memory page DWORD OldProtect = 0; if( !VirtualProtect( pTarget, Size, PAGE_EXECUTE_READWRITE, &OldProtect ) ) return false; // Write memory memcpy( pTarget, pSource, Size ); // Restore memory protection attributes of the target memory page DWORD Temp = 0; if( !VirtualProtect( pTarget, Size, OldProtect, &Temp ) ) return false; // Success return true; } </code></pre> <p>This example is adapted from code found here: <a href="http://www.debuginfo.com/articles/debugfilters.html#overwrite" rel="nofollow noreferrer">http://www.debuginfo.com/articles/debugfilters.html#overwrite</a> .</p>
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    1. USJorge Vasquez
    1. USJorge Vasquez
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      1. VTUpMod
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    3. VO
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    1. COHave you tried the same code in x64? Does it work?
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      1. POHow do I patch a Windows API at runtime so that it to returns 0 in x64?
      1. USJames K Polk
    2. COI think mfya just answered it.
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      1. POHow do I patch a Windows API at runtime so that it to returns 0 in x64?
      1. USJorge Vasquez
 

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