linux-kernel - Re: [PATCH 6/6] objtool: Validate kCFI calls

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Message-ID: <20250429161811.GC4439@noisy.programming.kicks-ass.net>
Date: Tue, 29 Apr 2025 18:18:11 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Josh Poimboeuf <jpoimboe@...nel.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, pawan.kumar.gupta@...ux.intel.com, seanjc@...gle.com,
	pbonzini@...hat.com, ardb@...nel.org, kees@...nel.org,
	Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.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 6/6] objtool: Validate kCFI calls

On Mon, Apr 14, 2025 at 04:43:26PM -0700, Josh Poimboeuf wrote:
> Can we call this ANNOTATE_NOCFI_SAFE or something?

I'm hesitant to do so, because some of these sites really are not safe.
EFI and VMX interrupt crud really are a security issue.

EFI really is unfixable but not less brokene, because the EFI code is
out of our control, the VMX thing might be fixable, not sure I
understand KVM well enough.