linux-kernel - Re: [PATCH] kallsyms: fix nonconverging kallsyms table with lld

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK8P3a2LTXme3pa-es=7s7aHX2EvC+2Dxegs=reuJrjeS4sygg@mail.gmail.com>
Date:   Thu, 10 Jun 2021 14:26:50 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        David Brazdil <dbrazdil@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Mikhail Petrov <Mikhail.Petrov@....dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marty Faltesek <mfaltesek@...gle.com>
Subject: Re: [PATCH] kallsyms: fix nonconverging kallsyms table with lld

On Thu, Jun 10, 2021 at 2:05 PM Guenter Roeck <linux@...ck-us.net> wrote:
> On Wed, Jun 09, 2021 at 10:30:23PM +0200, Arnd Bergmann wrote:
> > > I thought I'd see the added symbols, but it looks like the only difference
> > > between the two files is the addresses.
> > >
> > > What am I missing ?
> >
> > I probably misremembered the part about 'objdump --syms' and there was
> > something more to it.
> >
> > Maybe this was the last version before converging? It looks like the '<' version
> > has one extra symbol ompared to the '>' version. The diff has no context, but I
>
> It is the difference between step 1 and 2. Why would diff on objdump not
> show the additional symbol ? Is it possible that the symbol is not added
> to the object file ?

Note sure. The symbol must be in the object file, but perhaps the
'objdump --syms' output skips a different set of symbols compared
to the list that is used as input for kallsyms, which comes from '${NM}'.

Comparing the nm output might be another thing to try.

      Arnd