[PATCH v4 1/2] rust: SHADOW_CALL_STACK is incompatible with Rust

[Miguel Ojeda]

On Mon, Jul 29, 2024 at 4:23 PM Alice Ryhl <aliceryhl at google.com> wrote:
>
> When using the shadow call stack sanitizer, all code must be compiled
> with the -ffixed-x18 flag, but this flag is not currently being passed
> to Rust. This results in crashes that are extremely difficult to debug.
>
> To ensure that nobody else has to go through the same debugging session
> that I had to, prevent configurations that enable both SHADOW_CALL_STACK
> and RUST.
>
> It is rather common for people to backport 724a75ac9542 ("arm64: rust:
> Enable Rust support for AArch64"), so I recommend applying this fix all
> the way back to 6.1.

It should not hurt, and it is useful out-of-tree just in case -- if
arm64 is picking it up (which would be ideal):

Acked-by: Miguel Ojeda <ojeda at kernel.org>

Otherwise, please let us know. Thanks!

Cheers,
Miguel