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>
59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
"""find_alloc_size.py <exe_path> <hex_size>
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Search the .text section for `push <size>` followed by a call (operator new
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or HeapAlloc) — finds code sites that allocate buffers of that size."""
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import struct, sys
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def main():
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path = sys.argv[1]
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target = int(sys.argv[2], 0)
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with open(path, 'rb') as f:
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data = f.read()
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pe_off = struct.unpack_from('<I', data, 0x3C)[0]
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n_sec = struct.unpack_from('<H', data, pe_off + 4 + 2)[0]
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opt_off = pe_off + 4 + 20
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img_base = struct.unpack_from('<I', data, opt_off + 28)[0]
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opt_sz = struct.unpack_from('<H', data, pe_off + 4 + 16)[0]
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sec_off = opt_off + opt_sz
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for i in range(n_sec):
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s = sec_off + i*40
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name = data[s:s+8].rstrip(b'\x00').decode()
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if name == '.text':
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text_va = img_base + struct.unpack_from('<I', data, s+12)[0]
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raddr = struct.unpack_from('<I', data, s+20)[0]
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rsize = struct.unpack_from('<I', data, s+16)[0]
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text = data[raddr:raddr+rsize]
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break
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# Patterns:
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# 68 XX XX XX XX e8 YY YY YY YY = push imm32; call rel32
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needle1 = bytes([0x68]) + struct.pack('<I', target)
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# And:
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# 6A XX = push imm8 (only if target fits in byte; unlikely for 0x41000)
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print(f"Searching .text for `push 0x{target:08x}` followed by call...")
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off = 0
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found = 0
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while True:
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off = text.find(needle1, off)
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if off < 0: break
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# Check if next instruction (at +5) is a call (E8) or call indirect (FF 15 / FF 14)
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next_byte = text[off + 5] if off + 5 < len(text) else 0
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marker = ""
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if next_byte == 0xE8:
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target_rel = struct.unpack_from('<i', text, off + 6)[0]
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call_target = text_va + off + 5 + 5 + target_rel
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marker = f"-> call 0x{call_target:08x}"
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elif next_byte == 0xFF:
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marker = "-> call [...]"
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else:
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marker = f"-> next op 0x{next_byte:02x}"
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va = text_va + off
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print(f" 0x{va:08x}: push 0x{target:08x} {marker}")
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found += 1
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off += 5
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print(f"\nTotal: {found} sites")
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if __name__ == '__main__':
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main()
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