linux-kernel - Re: [PATCH v5] printk: Userspace format enumeration support

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: <YHmfQtHj1NY/oykv@chrisdown.name>
Date:   Fri, 16 Apr 2021 15:29:22 +0100
From:   Chris Down <chris@...isdown.name>
To:     Joe Perches <joe@...ches.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>, kernel-team@...com
Subject: Re: [PATCH v5] printk: Userspace format enumeration support

Joe Perches writes:
>On Fri, 2021-04-16 at 14:56 +0100, Chris Down wrote:
>> Any better suggestions? :-)
>
>A gcc plugin that looks for functions marked __printf(fmt, pos)
>so any const fmt is stored.

I fail to see any way in which that can solve the problem described, which is 
mobility of the level information, not the existence of the format itself.  
`__printf` doesn't communicate or imply any such information, since it's 
completely level agnostic.