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