Bug 287400 - Rust Echo Device Driver doesn't report errors to the kernel
Summary: Rust Echo Device Driver doesn't report errors to the kernel
Status: Closed Not Accepted
Alias: None
Product: Other
Classification: Unclassified
Component: Spam (show other bugs)
Version: unspecified
Hardware: amd64 Any
: --- Affects Only Me
Assignee: Bugmeister
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-06-09 18:32 UTC by Aaron Espinoza
Modified: 2025-06-10 09:03 UTC (History)
0 users

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Description Aaron Espinoza 2025-06-09 18:32:46 UTC 
Overview:
    David Young's echo Rust device driver for FreeBSD doesn't seem to return any errors to the kernel.

Steps to Reproduce: 

    1) Clone the driver repo: https://github.com/Acesp25/freebsd-kernel-module-rust
    2) Follow the steps in the github description to build and load the driver.
    3) Clone the kyua test repo into src/tests/: https://github.com/Acesp25/rustdrv
    4) Follow the steps in the github to install the tests in /usr/tests/rustdrv and run the tests

Actual Results:

    Error tests failed as no error was returned

Expected Results:

    An error should have been returned in the driver logic, thus making the error handling tests pass.

Build Date & Hardware:

    FreeBSD-15.0 running in a QEMU VM

Additional Information:

    I believe the bug is from the bottom two methods in bsd-kernel/src/character_device.rs from the driver repo.
    The read and write methods return 0 unconditionally.

    If there is any questions on the setup, feel free to reach out!
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2025-06-10 09:03:34 UTC 
^Triage: close as OBE.

This code is not (yet) in the FreeBSD src.  Therefore, an issue should be opened at:

https://github.com/nccgroup/freebsd-kernel-module-rust/issues