linux-kernel - Re: [PATCH v3 16/16] objtool: Validate kCFI calls

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Message-ID: <CANiq72kP7_24ChdQ+vDg+HWJB-4mKWvB9P33C9O=0W_kLt0+eA@mail.gmail.com>
Date: Mon, 14 Jul 2025 18:30:09 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com, 
	wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com, 
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, seanjc@...gle.com, 
	pbonzini@...hat.com, ardb@...nel.org, kees@...nel.org, 
	Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.org, jpoimboe@...nel.org, 
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, linux-efi@...r.kernel.org, samitolvanen@...gle.com, 
	ojeda@...nel.org
Subject: Re: [PATCH v3 16/16] objtool: Validate kCFI calls

On Mon, Jul 14, 2025 at 12:45 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> Apparently some Rust 'core' code violates this and explodes when ran
> with FineIBT.

I think this was fixed in Rust 1.88 (latest version), right? Or is
there an issue still?

    5595c31c3709 ("x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST
or Rust >= 1.88")

>  - runtime EFI is especially henous because it also needs to disable
>    IBT. Basically calling unknown code without CFI protection at
>    runtime is a massice security issue.

heinous
massive

Cheers,
Miguel