linux-kernel - Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs

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Message-ID: <CAD3Vwcptxyf+QJO7snZs_-MHGV3ARmLeaFVR49jKM=6MAGMk7Q@mail.gmail.com>
Date:   Wed, 3 Jan 2018 20:35:03 -0800
From:   Benjamin Gilbert <benjamin.gilbert@...eos.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509
 certs

On Wed, Jan 03, 2018 at 04:37:53PM -0800, Andy Lutomirski wrote:
> Maybe try rebuilding a bad kernel with free_ldt_pgtables() modified
> to do nothing, and the read /sys/kernel/debug/page_tables/current (or
> current_kernel, or whatever it's called).  The problem may be obvious.

current_kernel attached.  I have not seen any crashes with
free_ldt_pgtables() stubbed out.

--Benjamin Gilbert

Download attachment "current_kernel.gz" of type "application/gzip" (13830 bytes)