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Message-ID: <1517944227.3677.15.camel@infradead.org>
Subject: Re: [BUG] x86 : i486 reporting to be vulnerable to
 Meltdown/Spectre_V1/Spectre_V2
From:   David Woodhouse <dwmw2@infradead.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>, whiteheadm@acm.org
Cc:     Hugh Dickins <hughd@google.com>, dave.hansen@linux.intel.com,
        jikos@kernel.org, Borislav Petkov <bp@alien8.de>,
        Guenter Roeck <linux@roeck-us.net>,
        Kees Cook <keescook@chromium.org>,
        Jamie Iles <jamie@jamieiles.com>, eduval@amazon.com,
        labbott@redhat.com, Rik van Riel <riel@surriel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org
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Date:   Tue, 06 Feb 2018 19:10:27 +0000
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On Tue, 2018-02-06 at 11:02 -0800, Greg Kroah-Hartman wrote:
> .
> >=C2=A0
> > David
> >=C2=A0=C2=A0 I believe I got the patch(es) you mention in in the stable =
4.15.1 kernel:
> >=C2=A0
> > Pull x86/pti updates from Thomas Gleixner: "Another set of melted
> > spectrum related changes"
> > (commit 6304672b7f0a5c010002e63a075160856dc4f88d).
> >=C2=A0
> > Unfortunately, the symptoms I reported remain on at least the i486 and =
i686.
>=20
> Can you try 4.15.2-rc1?=C2=A0 Or how about Linus's kernel tree now?=C2=A0=
 There
> was a lot of spectrum patches merged just this week that were not in
> 4.15.1.

No, for the 486 it *should* have worked. The interesting commit
is=C2=A0fec9434a12 ("x86/pti: Do not enable PTI on CPUs which are not
vulnerable to Meltdown") which is indeed pulled in with the merge
commit that Matthew mentions.

Matthew, can you show the content of /proc/cpuinfo please? And perhaps
add a printk or two in early_identify_cpu() to work out what's going
on?

Your CPU *should* hit the x86_match_cpu(cpu_no_speculation) case and
not set any of the three bugs, AFAICT.
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