Passing empty parameter to wsl --exec fails with "The parameter is incorrect"

[segrey]

Environment

Windows build number: Microsoft Windows [Version 10.0.19042.546]
Your Distribution version: Ubuntu-20.04
Whether the issue is on WSL 2 and/or WSL 1: the issue is both on WSL 1 and WSL 2

Steps to reproduce

Run wsl.exe --distribution Ubuntu-20.04 --exec /bin/echo "" in cmd.exe.

WSL logs:

Expected behavior

wsl.exe --distribution Ubuntu-20.04 --exec /bin/echo "" should output an empty line, like wsl.exe --distribution Ubuntu-20.04 --exec /bin/bash -c "/bin/echo ''" does.

Actual behavior

The command fails with error The parameter is incorrect..

[therealkenc]

Please collect WSL logs and post the backlink to the feedback item here.

[segrey]

Done: https://aka.ms/AA9ypz2

[licanhua]

This is a bug.
@benhillis When LxssCreateProcess parse arguments, "" is treated as Invalid parameter. maybe we should support empty parameter and convert empty back to "" before we pass it to linux.

[microsoft-github-policy-service]

This issue has been automatically closed since it has not had any activity for the past year. If you're still experiencing this issue please re-file this as a new issue or feature request.

Thank you!