linux-kernel - Re: [PATCH] x86: Enable IBT in Rust if enabled in C

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Date:   Thu, 12 Oct 2023 16:13:10 -0400
From:   Trevor Gross <tmgross@...ch.edu>
To:     Matthew Maurer <mmaurer@...gle.com>
Cc:     peterz@...radead.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] x86: Enable IBT in Rust if enabled in C

On Mon, Oct 9, 2023 at 6:44 PM Matthew Maurer <mmaurer@...gle.com> wrote:
> +KBUILD_RUSTFLAGS += -Zcf-protection=branch -Zno-jump-tables

I have not tested this, but is it possible to enable these options via
`-Cllvm-args=...` instead of using the unstable flags?

If so, I think this would be preferred in case the exact flags change
before they become stable. It sounds like they are likely to change,
see [1].

If not, no big deal since it would just need an update at a rust version bump.

- Trevor

[1]: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/.60-Zbranch-protection.60.20stability