Initial commit — leak-hunt project complete

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>

tools/patch_v11_test.py

@@ -0,0 +1,123 @@
+"""patch_v11_test.py <pid> [--revert]
+
+v11: NULL-check / crash-guard patches for two observed crash sites.
+
+  Site 1 — delete_contents (Barris's crash at 0x0058712f)
+    Function at 0x005870f0. Inner trim loop has a state inconsistency
+    path that sets EDI=0 and falls through to MOV EAX,[EDI] → AV.
+    Patch: change the `JMP +0x07` at 0x00587126 (`eb 07`) to
+    `JMP +0x42` (`eb 42`) → jumps to function epilogue at 0x0058716a
+    (pop edi; pop esi; ret). Bails on empty-bucket-pass instead of
+    UAF.
+
+  Site 2 — ~GXTri3Mesh slot 0 (Kolossos's crash at 0x005e565d)
+    Destructor walks 5 subobject slots via vtable. The dereference at
+    0x005e565d (`MOV ECX,[EAX]`) crashes when slot pointer is freed.
+    Patch: replace the 9-byte deref+call+clear sequence
+    (`8b 08 50 ff 51 08 89 5e 08`) with
+    `89 5e 08 90 90 90 90 90 90`. Clears the slot but skips the
+    virtual call → trades subobject leak for no crash.
+
+This is the v11 patcher. Only patches the ONE slot we've observed
+crashing (slot 0 / +0x08 on the mesh). Other slots may need same
+treatment if they crash later.
+"""
+import argparse, ctypes, ctypes.wintypes as wt, sys
+
+
+SITES = [
+    ("site1 delete_contents JMP", 0x00587126,
+     bytes([0xEB, 0x07]),
+     bytes([0xEB, 0x42])),
+    ("site2 ~GXTri3Mesh slot 0",  0x005E565D,
+     bytes([0x8B, 0x08, 0x50, 0xFF, 0x51, 0x08, 0x89, 0x5E, 0x08]),
+     bytes([0x89, 0x5E, 0x08, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90])),
+]
+
+
+PROCESS_VM_READ = 0x10
+PROCESS_VM_WRITE = 0x20
+PROCESS_VM_OPERATION = 0x8
+PROCESS_QUERY_INFORMATION = 0x400
+PAGE_EXECUTE_READWRITE = 0x40
+
+k32 = ctypes.windll.kernel32
+OpenProcess = k32.OpenProcess
+OpenProcess.argtypes = [wt.DWORD, wt.BOOL, wt.DWORD]; OpenProcess.restype = wt.HANDLE
+CloseHandle = k32.CloseHandle
+CloseHandle.argtypes = [wt.HANDLE]; CloseHandle.restype = wt.BOOL
+WriteProcessMemory = k32.WriteProcessMemory
+WriteProcessMemory.argtypes = [wt.HANDLE, wt.LPVOID, wt.LPCVOID, ctypes.c_size_t,
+                               ctypes.POINTER(ctypes.c_size_t)]
+WriteProcessMemory.restype = wt.BOOL
+ReadProcessMemory = k32.ReadProcessMemory
+ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID, ctypes.c_size_t,
+                              ctypes.POINTER(ctypes.c_size_t)]
+ReadProcessMemory.restype = wt.BOOL
+VirtualProtectEx = k32.VirtualProtectEx
+VirtualProtectEx.argtypes = [wt.HANDLE, wt.LPVOID, ctypes.c_size_t, wt.DWORD,
+                             ctypes.POINTER(wt.DWORD)]
+VirtualProtectEx.restype = wt.BOOL
+
+
+def read_bytes(h, addr, n):
+    buf = (ctypes.c_ubyte * n)()
+    sz = ctypes.c_size_t(0)
+    if not ReadProcessMemory(h, addr, buf, n, ctypes.byref(sz)):
+        raise OSError(f"read 0x{addr:08x} err={ctypes.get_last_error()}")
+    return bytes(buf[:sz.value])
+
+
+def write_bytes(h, addr, data):
+    old = wt.DWORD(0)
+    if not VirtualProtectEx(h, addr, len(data), PAGE_EXECUTE_READWRITE, ctypes.byref(old)):
+        raise OSError(f"VirtualProtectEx 0x{addr:08x} err={ctypes.get_last_error()}")
+    sz = ctypes.c_size_t(0)
+    ok = WriteProcessMemory(h, addr, data, len(data), ctypes.byref(sz))
+    err = ctypes.get_last_error() if not ok else 0
+    restored = wt.DWORD(0)
+    VirtualProtectEx(h, addr, len(data), old.value, ctypes.byref(restored))
+    if not ok:
+        raise OSError(f"write 0x{addr:08x} err={err}")
+
+
+def apply_or_revert(h, label, va, orig, patched, revert):
+    cur = read_bytes(h, va, len(orig))
+    print(f"  {label} @ 0x{va:08x}: current {cur.hex()}")
+    if revert:
+        if cur == orig:
+            print(f"    already original")
+        elif cur == patched:
+            write_bytes(h, va, orig)
+            print(f"    reverted; now: {read_bytes(h, va, len(orig)).hex()}")
+        else:
+            print(f"    UNEXPECTED bytes — refusing"); sys.exit(3)
+        return
+    if cur == patched:
+        print(f"    already patched")
+    elif cur == orig:
+        write_bytes(h, va, patched)
+        print(f"    patched; now: {read_bytes(h, va, len(orig)).hex()}")
+    else:
+        print(f"    UNEXPECTED bytes — refusing. Expected: {orig.hex()}")
+        sys.exit(4)
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("pid", type=int)
+    ap.add_argument("--revert", action="store_true")
+    args = ap.parse_args()
+    h = OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_VM_OPERATION |
+                    PROCESS_QUERY_INFORMATION, False, args.pid)
+    if not h:
+        print(f"OpenProcess({args.pid}) err={ctypes.get_last_error()}"); sys.exit(2)
+    print(f"PID {args.pid}")
+    for label, va, orig, patched in SITES:
+        apply_or_revert(h, label, va, orig, patched, args.revert)
+    print(f"  OK")
+    CloseHandle(h)
+
+
+if __name__ == "__main__":
+    main()