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View Code? Open in Web Editor NEWRust embedded-hal driver for MAX7301 serial I/O expander
Rust embedded-hal driver for MAX7301 serial I/O expander
Hello fellow Rustacean,
we (Rust group @sslab-gatech) found a memory-safety/soundness issue in this crate while scanning Rust code on crates.io for potential vulnerabilities.
max7301/src/expander/immediate.rs
Lines 23 to 28 in a2084de
max7301/src/expander/transactional.rs
Lines 65 to 70 in a2084de
ImmediateIO
and TransactionIO
implement Sync
for M: IOMutex<Expander<EI>>, EI: ExpanderInterface
. This bound is seemingly unsound; it allows to send a reference of ImmediateIO
or TransactionIO
to another thread, and from there a mutable reference of Expander<EI>
can be accessed through IOMutex
APIs. This could result in a thread-safety violation when EI
is a non-Send type.
We suggest to add an Expander<EI>: Send
bound (or an equivalent EI: Send
bound) to those Sync
implementations, following the stdlib Mutex's Sync implementation.
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