linux-kernel - Re: [PATCH] KVM: arm64: Fix hypervisor address symbolization

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Message-ID: <CAC_TJveFHh1ykT0ctZC7zK_6rwNSgMe+242h_aVZ_48GD3Xtaw@mail.gmail.com>
Date:   Sun, 17 Jul 2022 12:02:00 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>,
        Fuad Tabba <tabba@...gle.com>, Will Deacon <will@...nel.org>,
        Quentin Perret <qperret@...gle.com>, android-mm@...gle.com,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: arm64: Fix hypervisor address symbolization

On Sun, Jul 17, 2022 at 3:43 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sat, 16 Jul 2022 00:58:24 +0100,
> Kalesh Singh <kaleshsingh@...gle.com> wrote:
> >
> > With CONFIG_RANDOMIZE_BASE=y vmlinux addresses will resolve correctly
>
> I guess you mean *incorrectly* here, right?

Yes, sorry. "INcorrectly" I meant to say.

>
> > from kallsyms. Fix this by adding the KASLR offset before printing the
> > symbols.
> >
> > Based on arm64 for-next/stacktrace.
>
> In general, place these remarks after the '---' line, as they don't
> really make sense in the commit itself (which is likely to be merged
> on a different base anyway).
>
> >
> > Fixes: 6ccf9cb557bd ("KVM: arm64: Symbolize the nVHE HYP addresses")
> > Reported-by: Fuad Tabba <tabba@...gle.com>
> > Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
> > ---
> >  arch/arm64/kvm/handle_exit.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
> > index f66c0142b335..e43926ef2bc2 100644
> > --- a/arch/arm64/kvm/handle_exit.c
> > +++ b/arch/arm64/kvm/handle_exit.c
> > @@ -347,10 +347,10 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
> >                       kvm_err("nVHE hyp BUG at: %s:%u!\n", file, line);
> >               else
> >                       kvm_err("nVHE hyp BUG at: [<%016llx>] %pB!\n", panic_addr,
> > -                                     (void *)panic_addr);
> > +                                     (void *)(panic_addr + kaslr_offset()));
> >       } else {
> >               kvm_err("nVHE hyp panic at: [<%016llx>] %pB!\n", panic_addr,
> > -                             (void *)panic_addr);
> > +                             (void *)(panic_addr + kaslr_offset()));
> >       }
> >
> >       /*
> >
>
> I'll fix the above as I apply the patch, no need to respin.

Thanks Marc.

-- Kalesh

>
> Thanks,
>
>         M.
>
> --
> Without deviation from the norm, progress is not possible.