Enable fuzz testing of Rust code for project Oak

[rbehjati]

Ref project-oak/oak#2047

[asraa]

I'll re-run when the oak PR is merged!

[rbehjati]

@asraa Thanks for the review. The Oak PR is merged now. Could you please rerun the CI checks?

[asraa]

Hmmm I think coverage might be hitting an llvm issue?

I think some other Rust projects were hitting this #4697 (comment)
rust-fuzz/cargo-fuzz#255

@catenacyber do you think so?

[catenacyber]

Looks like a rust wrapper named rustc.py is missing here

[rbehjati]

Thanks for the pointers. I am still looking into this. Locally, the error message I get is related to compiling tokio_util which seems to be different from the coverage errors on GitHub builds (before my most recent change).

[catenacyber]

If the build error is related to one of the dependencies/crates, you can either :

• use a rust wrapper to disable coverage for this specific crate
• try to solve the problem for this specific crate...

[rbehjati]

If the build error is related to one of the dependencies/crates, you can either :

• use a rust wrapper to disable coverage for this specific crate
• try to solve the problem for this specific crate...

Thanks. That helped.

[rbehjati]

We have received a failure report for a fuzz target that no longer exists: https://oss-fuzz.com/testcase?key=5379770520043520
Looks like oss-fuzz is running the old script. Could you please check?