linux-hardening - Re: [RFC PATCH v2 00/21] KCFI support

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Date:   Thu, 19 May 2022 13:41:42 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Sedat Dilek <sedat.dilek@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Joao Moreira <joao@...rdrivepizza.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        llvm@...ts.linux.dev
Subject: Re: [RFC PATCH v2 00/21] KCFI support

On Thu, May 19, 2022 at 1:26 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> On Thu, May 19, 2022 at 11:01:40AM +0200, Sedat Dilek wrote:
> > On Tue, May 17, 2022 at 8:49 PM Nathan Chancellor <nathan@...nel.org> wrote:
> > > I have run kCFI (v1, I haven't had time to test v2) on x86_64 hardware,
> > > both AMD and Intel. I have only found two failures so far: the i915
> > > issue that I mention below and a failure in the KVM subsystem, which I
> > > can see by just running QEMU:
> > >
> >
> > Is there a fix around this issue?
>
> No, I mentioned it offhand to Sami in IRC but I never followed up. This
> failure appears to be introduced by commit f922bd9bf33b ("KVM: Move MMU
> notifier's mmu_lock acquisition into common helper").
>
> Sami, do you want an issue opened around this somewhere?

Yes, please file a bug. The ClangBuiltLinux Github is probably the best place.

Sami