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

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Message-ID: <20250715083810.GN1613200@noisy.programming.kicks-ass.net>
Date: Tue, 15 Jul 2025 10:38:10 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
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 06:30:09PM +0200, Miguel Ojeda wrote:
> 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")

Oh yeah, it got fixed. Clearly I failed to update the Changelog.

> >  - 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

Typing hard; Thanks!