linux-kernel - Re: [PATCH] x86/dumpstack: Dump user space code correctly again

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Message-ID: <CAMe9rOoXQK5GgveVem2fSJWeAYUDjoKOo6ESpkU+29NfytNC7A@mail.gmail.com>
Date:   Wed, 22 Jul 2020 14:22:17 -0700
From:   "H.J. Lu" <hjl.tools@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] x86/dumpstack: Dump user space code correctly again

On Wed, Jul 22, 2020 at 12:47 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> "H.J. Lu" <hjl.tools@...il.com> writes:
> > On Wed, Jul 22, 2020 at 10:54 AM Thomas Gleixner <tglx@...utronix.de> wrote:
> >> +       if (copy_code(regs, opcodes, prologue, sizeof(opcodes))) {
> >>                 printk("%sCode: Bad RIP value.\n", loglvl);
> >>         } else {
> >>                 printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %"
> >
> > Add a kerel self test?
>
> Care to whip one up?
>

Can we count "dmesg" to always dump opcode?

-- 
H.J.