[PATCH v3] rust: make mutually exclusive with CFI_CLANG

[Miguel Ojeda]

On Thu, Apr 4, 2024 at 4:17 PM Conor Dooley <conor at kernel.org> wrote:
>
> From: Conor Dooley <conor.dooley at microchip.com>
>
> On RISC-V and arm64, and presumably x86, if CFI_CLANG is enabled,
> loading a rust module will trigger a kernel panic. Support for
> sanitisers, including kcfi (CFI_CLANG), is in the works, but for now
> they're nightly-only options in rustc. Make RUST depend on !CFI_CLANG
> to prevent configuring a kernel without symmetrical support for kfi.
>
> Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
> cc: stable at vger.kernel.org
> Signed-off-by: Conor Dooley <conor.dooley at microchip.com>

[ Matthew Maurer writes [1]:

    This patch is fine by me - the last patch needed for KCFI to be
    functional in Rust just landed upstream last night, so we should
    revisit this (in the form of enabling it) once we move to
    `rustc-1.79.0` or later.

  Ramon de C Valle also gave feedback [2] on the status of KCFI for
  Rust and created a tracking issue [3] in upstream Rust.   - Miguel ]

[ Added feedback from the list, links, and used Cc for the tag. ]

Applied to `rust-fixes` -- thanks everyone! Please feel free to send
more tags for this one.

Cheers,
Miguel