Re: [PATCH v3 2/2] rust: crypto: add synchronous RSA akcipher support

[Miguel Ojeda]

On Thu, Aug 27, 2026 at 5:05 AM Eric Biggers <ebiggers@xxxxxxxxxx> wrote:
>
> As I've been commenting on other of these bindings patches, it also
> doesn't really make sense to have the kconfig symbol be in lib/ but then
> have the actual code be in rust/.  They should be in the same place.

Did you see my reply at

  https://lore.kernel.org/rust-for-linux/CANiq72=uUR4Vo9W55Kq6tQjc+6Q4_+wiWhCo-VLdkvg6PJeoAw@xxxxxxxxxxxxxx/

?

But if you feel strongly about it, I guess it can be temporarily
placed elsewhere, i.e. Kconfig symbols are not tied to the path anyway
so they should be easy to move later on.

> > +__rust_helper void rust_helper_memzero_explicit(void *s, size_t count)
> > +{
> > +     memzero_explicit(s, count);
> > +}
>
> Isn't there a standard Rust solution for this?

If you mean a function in the standard library to zero memory without
being optimized out: no, there isn't.

For context: I added `memset_explicit` to the ISO C standard and
informally asked upstream Rust about adding an equivalent function
many years ago, but at least back then they didn't want to add it (or
at least in a way similar to how it is specified in C, which doesn't
really give guarantees, letting compiler writers do their best
effort).

I guess I can ask again since now we would finally have an actual user
in Linux... :)

I hope that helps!

Cheers,
Miguel