Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.38 as permitted sender) client-ip=23.128.96.38;
MIME-Version: 1.0
References: <20220927131518.30000-1-ojeda@kernel.org> <20220927131518.30000-26-ojeda@kernel.org>
 <Y0BfN1BdVCWssvEu@hirez.programming.kicks-ass.net> <CABCJKuenkHXtbWOLZ0_isGewxd19qkM7OcLeE2NzM6dSkXS4mQ@mail.gmail.com>
 <CANiq72k6s4=0E_AHv7FPsCQhkyxf7c-b+wUtzfjf+Spehe9Fmg@mail.gmail.com>
 <CABCJKuca0fOAs=E6LeHJiT2LOXEoPvLVKztA=u+ARcw=tbT=tw@mail.gmail.com> <CANiq72khuwOrAGN=CrFUX85UmPdJiZ2yM7_9_su_Zp951BHMMA@mail.gmail.com>
In-Reply-To: <CANiq72khuwOrAGN=CrFUX85UmPdJiZ2yM7_9_su_Zp951BHMMA@mail.gmail.com>
From:   Matthew Maurer <mmaurer@google.com>
Date:   Mon, 9 Oct 2023 09:00:58 -0700
Message-ID: <CAGSQo00gJsE+mQObeK4NNGDYLpZDDAZsREr15JcjD8Fo0E4pkw@mail.gmail.com>
Subject: Re: [PATCH v10 25/27] x86: enable initial Rust support
To:     Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc:     Sami Tolvanen <samitolvanen@google.com>,
        Peter Zijlstra <peterz@infradead.org>, rcvalle@google.com,
        Miguel Ojeda <ojeda@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-fsdevel@vger.kernel.org, patches@lists.linux.dev,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@google.com>,
        David Gow <davidgow@google.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, linux-doc@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

I have a patchset enabling support for both KCFI and IBT in the
kernel, but it uses changes not yet landed in stable rustc, which is
why I haven't sent it to the list yet:
https://github.com/Rust-for-Linux/linux/pull/1034

We've backported the changes to rustc that need to be present onto the
Android copy of the compiler, but it will take 6-12 weeks for them to
hit stable rustc, which is what general Linux is using.

If the IBT part would be helpful by itself immediately, I can split
that out - it's only the KCFI portion that won't currently work.

On Fri, Oct 14, 2022 at 1:40=E2=80=AFPM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Fri, Oct 14, 2022 at 8:35 PM Sami Tolvanen <samitolvanen@google.com> w=
rote:
> >
> > Thanks, Miguel. I also talked to Ramon about KCFI earlier this week
> > and he expressed interest in helping with rustc support for it. In the
>
> Ah, that is great to hear -- thanks a lot to you both! (Cc'ing Ramon)
>
> > meanwhile, I think we can just add a depends on !CFI_CLANG to avoid
> > issues here.
>
> ACK, thanks -- if you want to send the patch, please feel free to do so.
>
> Cheers,
> Miguel