linux-kernel - Re: sscanf: implement basic character sets

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Message-ID: <20160223194012.GB30919@packer-debian-8-amd64.digitalocean.com>
Date:	Tue, 23 Feb 2016 14:40:12 -0500
From:	Jessica Yu <jeyu@...hat.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sscanf: implement basic character sets

+++ Kees Cook [23/02/16 11:00 -0800]:
>On Tue, Feb 23, 2016 at 2:56 AM, Andy Shevchenko
><andriy.shevchenko@...ux.intel.com> wrote:
>> On Mon, 2016-02-22 at 16:24 -0500, Jessica Yu wrote:
>>> Implement basic character sets for the '%[]' conversion specifier.
>
>What part of the kernel will be using this feature, by the way?
>

I explained the motivation a bit more in patch v1's cover letter:
https://lkml.kernel.org/g/1455931259-27117-1-git-send-email-jeyu@redhat.com

The original idea stemmed from a discussion from the kernel livepatch mailing list:
https://lkml.org/lkml/2016/2/8/790

We were looking for a way to parse out substrings delimited by
something other than spaces. Specifically, in livepatch we are parsing
symbol names that contain substrings (which contain livepatch-specific
information) delimited by '.' and ','. Instead of manually looking for
these delimiters and adding a lot of string code to livepatch, it
would be cleaner to have a single sscanf() call to do the parsing for us.

Jessica