linux-kernel - Re: C aggregate passing (Rust kernel policy)

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Message-ID: <CANiq72kd2eTaPMcYSiQ61tZ2nX0jLM9SgsnbPEEbdNx+JQYFdg@mail.gmail.com>
Date: Tue, 25 Feb 2025 23:42:51 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Ventura Jack <venturajack85@...il.com>, Gary Guo <gary@...yguo.net>, airlied@...il.com, 
	boqun.feng@...il.com, david.laight.linux@...il.com, ej@...i.de, 
	gregkh@...uxfoundation.org, hch@...radead.org, hpa@...or.com, 
	ksummit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: C aggregate passing (Rust kernel policy)

On Tue, Feb 25, 2025 at 8:48 PM Kent Overstreet
<kent.overstreet@...ux.dev> wrote:
>
> I think the one thing that's missing w.r.t. aliasing that Rust could
> maybe use is a kasan-style sanitizer, I think with treeborrows and "now
> we have an actual model for aliasing optimizations" it should be possible
> to write such a sanitizer. But the amount of code doing complicated
> enough stuff with unsafe should really be quite small, so - shouldn't be

Miri implements those models and can check code for conformance. It
can be used easily in the Rust playground (top-right corner -> Tools
-> Miri):

    https://play.rust-lang.org

However, it does not work when you involved C FFI, though, but you can
play there. For more advanced usage, e.g. testing a particular model
like Tree Borrows, I think you need to use it locally, since I am not
sure if flags can be passed yet.

I would like to get it, plus other tools, into Compiler Explorer, see
e.g. https://github.com/compiler-explorer/compiler-explorer/issues/2563.

Cheers,
Miguel