pyr0ball
27174a1c79
Diagnosed and fixed the crash that killed HAVOC_NOCD.EXE ~1s after launch
(dgVoodoo window appears black, then the process exits). It was not a clean
exit: an ACCESS_VIOLATION (null-pointer read at VA 0x444E6A) during init.
Root cause is a copy-protection check in the WORLDS\ data-file loader
(0x42a480). It opens each file (GRAFIX/LAND/MAP/STUF) from both a local
"WORLDS\<name>" path and a CD-drive path (HAVOC.INI [SETUP] DRIVE=D:\), and
returns a valid stream only when the local open fails and the CD-drive open
succeeds. With files present locally and no D: drive it returned NULL, and the
GRAFIX loader (0x444db0) dereferenced that NULL without checking.
Fix: 14-byte patch at FO 0x29a2b rewrites the return decision to hand back the
successfully-opened local object. The game now boots to the title screen
("HAVOC(tm) by Reality Bytes"), responsive, main loop running.
- docs/PATCHES.md: full patch table (28 patches) + crash write-up
- tools/: RE + patching scripts (r2pipe disasm, minidump parser, ctypes
debugger, PE/IAT/import analysis)
- run_probe.bat / run_and_log.bat: reliable native launch for repro
- .gitignore: exclude CD images, Ghidra install/project, dgVoodoo, *.ini
Diagnosed via WER minidumps (%LOCALAPPDATA%\CrashDumps) parsed in pure Python
(no cdb/windbg available).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TN4Ytn3gdWRonNmHpisWQv
23 lines
730 B
Python
23 lines
730 B
Python
import r2pipe, sys, io
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sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
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r2 = r2pipe.open("Z:/Development/devl/Havoc/HAVOC_NOCD.EXE",
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["-e", "bin.relocs.apply=true"])
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# No aaa - just raw disassembly
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print("=== crash_stub at 0x40AB90 (crash site) ===")
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print(r2.cmd("pd 4 @ 0x40ab90"))
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print("\n=== pool allocator 0x40AAF0 (what calls crash_stub?) ===")
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print(r2.cmd("pd 50 @ 0x40aaf0"))
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print("\n=== function 0x429CA0 = caller FO 0x290A0 ===")
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print(r2.cmd("pd 60 @ 0x429ca0"))
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print("\n=== 0x40ABD0: zeroed alloc (does it check for NULL?) ===")
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print(r2.cmd("pd 20 @ 0x40abd0"))
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print("\n=== 0x465050: VirtualAlloc path ===")
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print(r2.cmd("pd 30 @ 0x465050"))
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r2.quit()
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