57b5e43d0e
Five bugs identified and patched in retail Asheron's Call client: - v3b: palette refcount over-increment (3-byte NOP at two sites) - v5: RenderSurface PurgeResource no-op stub (vtable slot 2 thunk) - v11: two dangling-pointer crash guards (NULL-check + reorder) - v14: CEnvCell::Destroy ClipPlaneList leak (18-byte JMP to cleanup thunk) - v22: unpacker stale-pointer SEH guard (whole-function __try/__except) All five ship in leakfix.dll (117 KB, SHA d282f23c…) which is loaded by acclient.exe at process start via PE import table patching by tools/install_leakfix.py. Controlled 15-client fleet soak: unpatched control died at 26h with palette exhaustion; all 14 patched clients survived past that point and reached ≥5-day uptime. Residual ~15 MB/h growth traced to d3d9.dll's internal slab allocator (260KB surface backing buffers retained after Release). See REPORT.md §10 for the full investigation; conclusion is that it's unfixable from outside d3d9. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
68 lines
2.7 KiB
Python
68 lines
2.7 KiB
Python
"""dump_vtable.py <pid> <vtable_va> [n_slots=16]
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Read N vtable slots from a live process and dump first 16 bytes of each.
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Useful for fingerprinting classes — compare slot patterns to known vtables."""
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import ctypes, ctypes.wintypes as wt, sys
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PROCESS_VM_READ = 0x10
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PROCESS_QUERY_INFORMATION = 0x400
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k = ctypes.windll.kernel32
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k.OpenProcess.argtypes = [wt.DWORD, wt.BOOL, wt.DWORD]
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k.OpenProcess.restype = wt.HANDLE
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k.CloseHandle.argtypes = [wt.HANDLE]
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k.CloseHandle.restype = wt.BOOL
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k.ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID,
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ctypes.c_size_t, ctypes.POINTER(ctypes.c_size_t)]
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k.ReadProcessMemory.restype = wt.BOOL
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def read(h, va, n):
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buf = (ctypes.c_ubyte * n)()
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sz = ctypes.c_size_t(0)
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if not k.ReadProcessMemory(h, va, buf, n, ctypes.byref(sz)):
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return None
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return bytes(buf[:sz.value])
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def main():
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pid = int(sys.argv[1])
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vt_va = int(sys.argv[2], 0)
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n_slots = int(sys.argv[3]) if len(sys.argv) > 3 else 16
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h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid)
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if not h:
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print(f"OpenProcess pid={pid} err={ctypes.get_last_error()}")
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sys.exit(2)
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# Read N slots (4 bytes each)
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slot_bytes = read(h, vt_va, n_slots * 4)
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if not slot_bytes:
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print(f"ReadProcessMemory @ vtable 0x{vt_va:08x} err={ctypes.get_last_error()}")
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sys.exit(3)
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print(f"vtable @ 0x{vt_va:08x} in pid {pid}")
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slots = []
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for i in range(n_slots):
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slot = int.from_bytes(slot_bytes[i*4:i*4+4], 'little')
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slots.append(slot)
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for i, slot in enumerate(slots):
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prologue = read(h, slot, 16) if slot else None
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if prologue:
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hexs = prologue.hex(' ')
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hints = []
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if prologue[:1] == b'\x55': hints.append("push ebp")
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if prologue[:1] == b'\x56': hints.append("push esi")
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if prologue[:1] == b'\x53': hints.append("push ebx")
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if prologue[:3] == b'\xb0\x01\xc3': hints.append("mov al,1;ret (return-true stub)")
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if prologue[:3] == b'\xb0\x00\xc3': hints.append("mov al,0;ret (return-false stub)")
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if prologue[:3] == b'\x33\xc0\xc3': hints.append("xor eax,eax;ret (return-0 stub)")
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if prologue[:1] == b'\xc3': hints.append("bare ret (pure no-op)")
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if prologue[:1] == b'\xc2': hints.append(f"retn imm16")
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if prologue[:2] == b'\xe9\x00' or prologue[:1] == b'\xe9': hints.append("jmp (thunk)")
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hint_str = " -- " + "; ".join(hints) if hints else ""
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print(f" slot[{i:2d}] = 0x{slot:08x} {hexs}{hint_str}")
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else:
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print(f" slot[{i:2d}] = 0x{slot:08x} (unreadable)")
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k.CloseHandle(h)
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if __name__ == '__main__':
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main()
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