linux-kernel - Re: [PATCH] Compiler Attributes: Add __kcfi

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Message-ID: <CABCJKufPphD3en91N89yekUam4Nv7+C7YPJMv7h2SmZcyhGhdA@mail.gmail.com>
Date: Thu, 17 Jul 2025 09:48:21 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Kees Cook <kees@...nel.org>, Bill Wendling <morbo@...gle.com>, 
	Andrew Cooper <andrew.cooper3@...rix.com>, Arnd Bergmann <arnd@...db.de>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
	Justin Stitt <justinstitt@...gle.com>, llvm@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] Compiler Attributes: Add __kcfi_salt

On Thu, Jul 17, 2025 at 3:08 AM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Thu, Jul 17, 2025 at 11:51 AM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > It would be nice to have a quick sentence inline summarizing how it
> > will be used, e.g. what kind of functions will need to be annotated.
>
> By the way, related to the use case question: would we eventually want
> such an attribute for Rust too? If so, happy to help.

I would definitely like to see Rust support for this too. Otherwise,
we would have to drop the attribute when Rust is enabled to avoid CFI
type mismatches with C code.

Sami