linux-kernel - Re: [PATCH 3/4] x86/rust: depend on !RETHUNK

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Message-ID: <cd0eb23b-6c46-4069-ba29-9820c99b8ca8@gmail.com>
Date:   Tue, 24 Oct 2023 15:48:33 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>, x86@...nel.org,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev
Subject: Re: [PATCH 3/4] x86/rust: depend on !RETHUNK

On 10/23/23 19:15, Miguel Ojeda wrote:
> On Mon, Oct 23, 2023 at 8:43 PM Martin Rodriguez Reboredo
> <yakoyoku@...il.com> wrote:
>>
>> I'll mention that I've tested boots, both in bare metal and QEMU, with
>> `RUST=y` and `RETHUNK=y` and they were alright regardless of `objtool`
>> warnings. Although, if you had an issue in the past then I'd like to know
>> about it.
> 
> These are mitigations -- things do functionally work if they are not
> applied, but you would be vulnerable.
> 
> In other words, it is not like e.g. IBT where you could have noticed
> it breaking by running it normally if you happened to have a supported
> platform.
> 
> Cheers,
> Miguel

'Guess you have a point...

Acked-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>