From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S932127AbeDCLwT (ORCPT <rfc822;w@1wt.eu>);
        Tue, 3 Apr 2018 07:52:19 -0400
Received: from mx2.suse.de ([195.135.220.15]:59999 "EHLO mx2.suse.de"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S932089AbeDCLwS (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 3 Apr 2018 07:52:18 -0400
Date: Tue, 3 Apr 2018 13:52:16 +0200
From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        "Tobin C . Harding" <me@tobin.cc>, Joe Perches <joe@perches.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH v3] vsprintf: Prevent crash when dereferencing invalid
 pointers
Message-ID: <20180403115216.mgq3omvl4up24uic@pathway.suse.cz>
References: <CA+55aFwaNTC2HV9ERDFWCrmhvgZ58SKMM+ik9Ypr3i-ZUyU6Fw@mail.gmail.com>
 <20180309150153.3sxbbpd6jdn2d5yy@pathway.suse.cz>
 <CA+55aFwT-Vd+sVdAVemUjUvkNYFiLyVMHZxv9hF6KzRM7i4Yrg@mail.gmail.com>
 <20180314140947.rs3b6i5gguzzu5wi@pathway.suse.cz>
 <1521119343.10722.665.camel@linux.intel.com>
 <20180315152607.xgzjmj5as6lg42dy@pathway.suse.cz>
 <1521224375.23017.41.camel@linux.intel.com>
 <20180329145312.4uqygrjqy3fqyl26@pathway.suse.cz>
 <1522678523.21176.178.camel@linux.intel.com>
 <20180403011237.GA7129@jagdpanzerIV>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180403011237.GA7129@jagdpanzerIV>
User-Agent: NeoMutt/20170421 (1.8.2)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue 2018-04-03 10:12:37, Sergey Senozhatsky wrote:
> On (04/02/18 17:15), Andy Shevchenko wrote:
> > > 
> > > Hmm, I have never seen the error code in this form.
> > 
> > We have limited space to print it and error numbers currently can be up
> > to 0xfff (4095). So, I have no better idea how to squeeze them while
> > thinking that "(efault)" is much harder to parse in case of error
> 
> 'efault' looks to me like a misspelled 'default', for some reason.

I wonder if (-efault) would help a bit.

Even better might be (-EFAULT). But then it would be better to use
(NULL). It already was but it was explicitly changed to the lowercase
variant by the commit 0f4f81dce93774a447da3c ("vsprintf: factorize
"(null)" string").

Best Regards,
Petr