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Harmless PoC: ExecuTorch MethodMeta I/O index vector length OOB

MethodMeta::num_inputs / input_tag (and num_outputs / output_tag) index ExecutionPlan.inputs[index] / outputs[index] using a forged FlatBuffer vector length with no bound against the program buffer. Under default Program::Verification::Minimal, loading a malicious .pte and calling input_tag(0) triggers ASan heap-buffer-overflow READ at method_meta.cpp:171.

Distinct from submitted MethodMeta Tensor.sizes, packaged Program execution_plan / backend_delegate_data, constant/mutable offsets, and Method::init values/operators/delegates/list-items.

Files

poc_method_io_index_asan.cpp, asan.log, asan_outputs_oob.log
method_load_stub.cpp (link stub for unused Method::load)
NOTES.md

./poc_method_io_index_asan inputs-oob
# ./poc_method_io_index_asan outputs-oob

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