linux-kernel - Re: [RFC] QR encoding for Oops messages

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:	Fri, 4 Apr 2014 11:15:42 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	David Lang <david@...g.hm>
Cc:	Levente Kurusa <levex@...ux.com>,
	Teodora Băluţă <teobaluta@...il.com>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [RFC] QR encoding for Oops messages

On Thu, Apr 03, 2014 at 01:57:04PM -0700, David Lang wrote:
> On Tue, 1 Apr 2014, Jason Cooper wrote:
> 
> >>Now I guess we need to think how to make it work without a
> >>framebuffer. I already suggested using the ASCII characters,
> >>but seeing the resolution of this QR code for example (147x147),
> >>made me realize that we can't shuffle that into a 80x25 textmode
> >>display. Any ideas how to fix that or should we just simply depend
> >>on a framebuffer being present?
> >
> >I think depending on the framebuffer being present (via kconfig) is
> >sane.  Folks running old systems know what they're in for, like missing
> >shiny new features. ;-)
> 
> First get it working and into acceptable form, but after that, take
> a look at the various ASCII-art tools out there. While the display
> may be limited to 80x25, that's not a hard requirement (and I'd
> happily run systems with a smaller text console if this was an
> option), and then you can look at the possibility of using
> characters that represent more than one pixel per character. While
> this may not be able to render everything perfectly, remember that
> qr codes can include redundancy to correct for bad pixels, you may
> be able to get something working.

I'm not sure this will work.  The screen space allocated to a single
character isn't square.  However, the QR pixels are square.  I see a lot
of fragile complexity ahead...

thx,

Jason.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/