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Message-ID: <20110622190739.GB14351@albatros> Date: Wed, 22 Jun 2011 23:07:39 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: Alan Cox <alan@...rguk.ukuu.org.uk> Cc: Joe Perches <joe@...ches.com>, Andrew Morton <akpm@...ux-foundation.org>, James Morris <jmorris@...ei.org>, Ingo Molnar <mingo@...e.hu>, Namhyung Kim <namhyung@...il.com>, Greg Kroah-Hartman <gregkh@...e.de>, kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org, security@...nel.org Subject: Re: [PATCH] kernel: escape non-ASCII and control characters in printk() Hi Alan, On Wed, Jun 22, 2011 at 19:10 +0100, Alan Cox wrote: > If that is set you shouldn't be filtering out unicode, just control codes. OK. > Minor other nit is that you might want to allow BEL through and you > certainly want to allow tab through. In what situation do you think BEL makes sense in kernel log? I cannot image the situation. Alarms should use KERN_EMERG/KERN_ALERT log level. > The core code should not be hardcoding policy assumptions about symbol > sets and ASCII, for an awful lot of consoles today that assumption is > just plain wrong, for others it makes sense No problem, I don't insist. > So with tty maintainer hat on - NAK to the current approach but a good > idea to do it properly. The final check should be: if (iscntrl(c) && (c != '\n') && (c != '\t')) Any comments against this variant? Thanks, -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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