Reported

July 6, 2024

Issued

June 17, 2025

Package

wasmtime-jit-debug (crates.io)

Type

INFO Unsound

Categories

• memory-exposure

References

• https://github.com/bytecodealliance/wasmtime/issues/8905

Patched

• >=24.0.0

Affected Functions

Version

wasmtime_jit_debug::perf_jitdump::JitDumpFile::dump_code_load_record

• <=24.0.0

Description

The unsound function dump_code_load_record uses from_raw_parts to directly convert the pointer addr and len into a slice without any validation and that memory block would be dumped.

Thus, the 'safe' function dump_code_load_record is actually 'unsafe' since it requires the caller to guarantee that the addr is valid and len must not overflow. Otherwise, the function could dump the memory into file illegally, causing memory leak.

Note: this is an internal-only crate in the Wasmtime project not intended for external use and is more strongly signaled nowadays as of bytecodealliance/wasmtime#10963. Please open an issue in Wasmtime if you're using this crate directly.

Advisory available under CC0-1.0 license.