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PoC: compute_numel() Integer Overflow on MSVC (Windows) Builds

Vulnerability: c10/core/TensorImpl.h:2596-2604 — compute_numel() uses the unsafe multiply_integers() path on MSVC builds because C10_HAS_BUILTIN_OVERFLOW() is unconditionally 0 on MSVC (safe_numerics.h:9-10). This disables overflow detection for all Windows PyTorch users.

Files

poc_numel_msvc_overflow.py — Full PoC (crafted model + UBSan-confirmed overflow)
test_msvc_overflow.cpp — Standalone C++ UBSan test
numel_overflow_model.pt — Crafted model with overflow dimensions

Quick Start

pip install torch
python poc_numel_msvc_overflow.py

Expected Output

GCC/Clang: safe_compute_numel() catches overflow (RuntimeError)
MSVC path: multiply_integers() silently overflows (UBSan confirmed)

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