linux-kernel - Re: [PATCH] lib: vsprintf: add printf format conversion %M for errno strings

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]

Date:   Sun, 25 Jun 2017 10:27:04 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Enrico Weigelt, metux IT consult" <enrico.weigelt@...3.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: vsprintf: add printf format conversion %M for
 errno strings

On Sun, 2017-06-25 at 19:12 +0200, Enrico Weigelt, metux IT consult
wrote:
> Adding a new format conversion for *printf() and friends.

Every use of %M is going to cause gcc when using __printf to emit
a warning like:

unknown conversion type character ‘M’ in format [-Wformat=]

Beyond that, why is this useful?
There can't possibly be any fast-path use.
Why not just create a function that does errno/string conversions?