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Hi,

I was testing latest version of VMProtect (3.0.2.470) and it seems that it cannot virtualize fldcw instruction. What's interesting its counterpart fstcw compiles without problems.

Here's a minimal sample to reproduce this issue (compile using VS): Protection settings and compilation log:

Thank you for your report. We'll fix it in next build.

Wow... so much to learn!

tmp wrote:Hi,

I was testing latest version of VMProtect (3.0.2.470) and it seems that it cannot virtualize fldcw instruction. What's interesting its counterpart fstcw compiles without problems.

Here's a minimal sample to reproduce this issue (compile using VS):

Code: Select all

__declspec(noinline) void vmProtectionFailureTest()
{
	unsigned short cw;
	__asm
	{
		fstcw cw
		fldcw cw
	}
}

int main()
{
	vmProtectionFailureTest();
	return 0;
}

Protection settings and compilation log:

Thanks for fixing this issue in 3.0.3.481. Unfortunately I've found another corner case for virtualization:


Again it's suprising that complementary pushad is handled properly but popad is not.

Thank you for your report.