linux-kernel - [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre

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Date:   Fri, 2 Feb 2018 23:52:30 -0500
From:   tedheadster <tedheadster@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>, hughd@...gle.com,
        dave.hansen@...ux.intel.com, jikos@...nel.org, bp@...en8.de,
        linux@...ck-us.net, Kees Cook <keescook@...omium.org>,
        jamie@...ieiles.com, dwmw2@...radead.org, eduval@...zon.com,
        labbott@...hat.com, riel@...riel.com,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2

I just tested the 4.15 kernel and it is reporting that my old i486
(non-cpuid capable) cpu is vulnerable to all three issues: Meltdown,
Spectre V1, and Spectre V2.

I find this to be _unlikely_.

/sys/devices/system/cpu/vulnerabilities/* reports the following:

meltdown: "Vulnerable"
spectre_v1: "Vulnerable"
spectre_v2: "Vulnerable: Minimal generic ASM retpoline"

The output of dmesg includes:

"Spectre V2 mitigation: Vulnerable: Minimal generic ASM retpoline"
"Spectre V2 mitigation: Filling RSB on context switch"

Also, /proc/cpuinfo reports the following:

cpuid level: -1
flags: fpu retpoline rsb_ctxsw
bugs: cpu_meltdown spectre_v1 spectre_v2

I have the hardware to test on. Send me your patches.

- Matthew Whitehead