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RUSTSEC-2023-0014

Miscompilation in cortex-m-rt 0.7.1 and 0.7.2

Reported
Issued
Package
cortex-m-rt (crates.io)
Type
INFO Unsound
Details
https://github.com/rust-embedded/cortex-m/discussions/469
Patched
  • >=0.7.3
Unaffected
  • <=0.7.0

Description

Version 0.7.1 of the cortex-m-rt crate introduced a regression causing the stack to NOT be eight-byte aligned prior to calling main (or any other specified entrypoint), violating the stack ABI of AAPCS32, the default ABI used by all Cortex-M targets. This regression is also present in version 0.7.2 of the cortex-m-rt crate.

This regression can cause certain compiler optimizations (which assume the eight-byte alignment) to produce incorrect behavior at runtime. This incorrect behavior has been observed in real-world applications.

It is advised that ALL users of v0.7.1 and v0.7.2 of the cortex-m-rt crate update to the latest version (v0.7.3), AS SOON AS POSSIBLE. Users of v0.7.0 and prior versions of cortex-m-rt are not affected by this regression.

It will be necessary to rebuild all affected firmware binaries, and flash or deploy the new firmware binaries to affected devices.