linux-kernel - Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI

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Message-ID: <20240227-uncertain-amaze-6197e627ad95@wendy>
Date: Tue, 27 Feb 2024 10:53:35 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
CC: Conor Dooley <conor@...nel.org>, Matthew Maurer <mmaurer@...gle.com>,
	<linux-riscv@...ts.infradead.org>, Miguel Ojeda <ojeda@...nel.org>, Alex
 Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, Jonathan
 Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer
 Dabbelt <palmer@...belt.com>, Nathan Chancellor <nathan@...nel.org>, Nick
 Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
	<rust-for-linux@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
	<stable@...r.kernel.org>, Sami Tolvanen <samitolvanen@...gle.com>, Ramon de C
 Valle <rcvalle@...gle.com>
Subject: Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI_CLANG

On Fri, Feb 23, 2024 at 03:45:10PM +0100, Miguel Ojeda wrote:
> On Fri, Feb 23, 2024 at 2:38 PM Conor Dooley <conor@...nel.org> wrote:
> >
> > configuring a kernel without symmetrical support for kfi.
> 
> Nit: typo.
> 
> > This probably needs to go to stable. The correct fixes tag for that I am
> > not sure of however, but since CFI_CLANG predates RUST, I blamed the
> > commit adding rust support.
> 
> Cc'ing Matthew et al. in case this is a problem for them, but I guess
> we can relax it later as needed.

I suspect that nobody has actually sat down and tried it.

I did try to test it but I ran into too many toolchain issues - my
older copies of LLVM (pre 17) are not multiarch as I built them by hand
with PGO for x86 and RISC-V. My LLVM 17 is from kernel.org and has no
libclang. And then the copy of LLVM 18 on kernel.org apparently does not
support kcfi at all. I gave up there, but I don't see how this would not
be a problem on other arches, given rustc never gets told to enable
kcfi.

Cheers,
Conor.

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