linux-kernel - Re: [PATCH 1/2] kallsyms: add kallsyms_show

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Date:   Thu, 12 May 2022 12:53:05 +0300
From:   "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
To:     Maninder Singh <maninder1.s@...sung.com>
Cc:     Kees Cook <keescook@...omium.org>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "avimalin@...il.com" <avimalin@...il.com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "kafai@...com" <kafai@...com>,
        "songliubraving@...com" <songliubraving@...com>,
        "yhs@...com" <yhs@...com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>,
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        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
        "linux@...musvillemoes.dk" <linux@...musvillemoes.dk>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Vaneet Narang <v.narang@...sung.com>,
        Onkarnath <onkarnath.1@...sung.com>
Subject: Re: [PATCH 1/2] kallsyms: add kallsyms_show_value definition in all
 cases

On Thu, May 12, 2022 at 09:16:50AM +0530, Maninder Singh wrote:
> > On Wed, May 11, 2022 at 01:36:56PM +0530, Maninder Singh wrote:

...

> > This is printing raw kernel addresses with no hashing, as far as I can
> > tell. That's not okay at all.
> 
> yes same was suggested by Petr also, because earlier we were printing base address also as raw address.
> 
> https://lkml.org/lkml/2022/2/28/847
> 
> but then modified approach to print base address as hash when we are going to show offset of module address,
> but when we print complete address then we thought of keeping it same as it was:
> 
> original:
>  [12.487424] ps 0xffff800000eb008c
> with patch:
>  [9.624152] ps 0xffff800001bd008c [crash]
> 
> But if its has to be hashed, will fix that also.

In such case it should be a separate change since it will be the one that
changes behaviour.

-- 
With Best Regards,
Andy Shevchenko