linux-kernel - Re: [PATCH v3 2/2] hexdump: add a new dump prefix DUMP_PREFIX

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: <20230816033418.GD681074@google.com>
Date:   Wed, 16 Aug 2023 12:34:18 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...weicloud.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 2/2] hexdump: add a new dump prefix DUMP_PREFIX_CUSTOM

On (23/08/16 11:20), Leizhen (ThunderTown) wrote:
> > IMHO, this is pretty bad interface.
> > 
> >   + From the user POV:
> > 
> >     It is far from clear what values will be passed for the given
> >     printf format. It can be docummented but...
> > 
> > 
> >   + From the security POV:
> > 
> >     The compiler could not check if the printk() parameters
> >     match the format. I mean if the number of types of
> >     the parameters are correct.
> 
> Yes, it has these problems. So, back to v2, how about add DUMP_PREFIX_ADDRESS_LOW16?
> Or named DUMP_PREFIX_ADDR16 or others. Or change the format of DUMP_PREFIX_ADDRESS
> from "%p" to "%px"，Or add DUMP_PREFIX_RAWADDR. Or keep the status quo.

Linus quite likely will dislike (with passion) the idea of using %px.