Update the time crate to 0.3

[sylvestre]

We are currently using 0.1 and it has some issues.
We should update to version 0.3

Must be updated at least in these crates:

Cargo.toml
src/uu/install/Cargo.toml
src/uu/touch/Cargo.toml
src/uucore/Cargo.toml

[tertsdiepraam]

Some interesting context here: time has a vulnerability in version 0.1, see:

• https://rustsec.org/advisories/RUSTSEC-2020-0071.html
• Force minimal version of chrono to avoid a security issue #2879

I also wonder whether this security issue might be related to

• Thread sanitizer is throwing an error in test_cp #1750

At least it's worth checking whether that last issue is fixed once we have upgraded.

[g-k]

Started looking for migration docs for this. The changelog says versions before 0.2.7 are in release notes and the oldest release with notes is 0.2.0 which refs time-rs/time#190.

[tertsdiepraam]

So, I also started searching, found their book, and got excited when I found this page: https://time-rs.github.io/book/migration/0.3.html

But it's empty 😄 Looks like we just have to rely on the documentation and tests for this migration.

[sylvestre]

cargo audit returns:

Crate:         time
Version:       0.1.43
Title:         Potential segfault in the time crate
Date:          2020-11-18
ID:            RUSTSEC-2020-0071
URL:           https://rustsec.org/advisories/RUSTSEC-2020-0071
Solution:      Upgrade to >=0.2.23

[g-k]

OK! I started working on this and have fsext.rs in uucore updated.

coreutils uses the time::tm for times and time::Timespec timestamps. Per this comment they were removed in time >0.1.

I'm going to switch the places coreutils relies on those structs to chrono, which is "aims to be a feature-complete superset of the time library" and coreutils already uses elsewhere but it'll likely require some changes to non-test code in touch.

edit: actually that won't fix the CVE since chrono uses a vulnerable version chronotope/chrono#632 so we'll want to get chrono to cut a release (but it looks unmaintained) or target std::time and time 0.3.

edit2: aha! https://time-rs.github.io/format-converter/

[sylvestre]

@g-k are you still working on it? thanks

[g-k]

I'd like to finish this but I haven't worked on it recently. Other people should feel free to finish it.

I started working on this in https://github.com/uutils/coreutils/compare/main...g-k:2884-time-0.3?expand=1 running with RUSTFLAGS="--cfg unsound_local_offset". That branch also includes changes to stop using chrono to fix the CVE, but fixing that might be better to fix in a separate PR. The chrono team is working on or fixed the issue, so maybe it's easier to do both now. I also think the unsoundness from the CVE is unlikely to impact utils in this project, since I don't think the utils are multithreaded or run long enough to see changes to the relevant env vars.

[sylvestre]

I'd like to finish this but I haven't worked on it recently.

Do you have an eta? :)