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Skip NOP codes when jumping back #13

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Skip NOP codes when jumping back #13

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6 changes: 4 additions & 2 deletions SyringeDebugger.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -247,10 +247,12 @@ DWORD SyringeDebugger::HandleException(DEBUG_EVENT const& dbgEvent)
p_code += overridden;
}

const auto overridden_len = std::max(overridden, sizeof(jmp));

// write the jump back
auto const rel = RelativeOffset(
base + (p_code - code.data() + 0x05),
static_cast<BYTE*>(it.first) + 0x05);
static_cast<BYTE*>(it.first) + /*0x05*/overridden_len);
ApplyPatch(p_code, jmp_back);
ApplyPatch(p_code + 0x01, rel);

Expand All @@ -277,7 +279,7 @@ DWORD SyringeDebugger::HandleException(DEBUG_EVENT const& dbgEvent)
auto const p_original_code = static_cast<BYTE*>(it.first);

auto const rel2 = RelativeOffset(p_original_code + 5, base);
code.assign(std::max(overridden, sizeof(jmp)), NOP);
code.assign(overridden_len, NOP);
ApplyPatch(code.data(), jmp);
ApplyPatch(code.data() + 0x01, rel2);

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