linux-kernel - Re: [PATCH 0/5] x86/dumpstack: Cleanups and user opcode bytes Code: section

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Message-ID: <20180220192956.si2a6m3ckskexvte@treble>
Date:   Tue, 20 Feb 2018 13:29:56 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] x86/dumpstack: Cleanups and user opcode bytes Code:
 section

On Tue, Feb 20, 2018 at 07:14:00PM +0000, Andy Lutomirski wrote:
> On Mon, Feb 19, 2018 at 8:28 PM, Borislav Petkov <bp@...en8.de> wrote:
> > From: Borislav Petkov <bp@...e.de>
> >
> > Hi,
> >
> > so I've been thinking about doing this for a while now: be able to dump
> > the opcode bytes around the user rIP just like we do for kernel faults.
> >
> > Why?
> >
> > See patch 5's commit message. That's why I've marked it RFC.
> >
> > The rest is cleanups: we're copying the opcodes byte-by-byte and that's
> > just wasteful.
> 
> Maybe this series already has this side-effect, but I'd really love to
> see oopses show the code bytes for each kernel entry, not just the
> innermode one.  We already dump full regs including RIP -- adding
> Code: should be easy and would be very helpful.

Just to clarify, I think you want to show the Code: around regs->ip
every time we show the registers?

-- 
Josh