linux-kernel - Re: livepatch: old_name@..._addr scheme in livepatch sysfs directory

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Message-ID: <20151102090832.GB24801@packer-debian-8-amd64.digitalocean.com>
Date:	Mon, 2 Nov 2015 04:08:32 -0500
From:	Jessica Yu <jeyu@...hat.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Chris J Arges <chris.j.arges@...onical.com>,
	live-patching@...r.kernel.org,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.com>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: livepatch: old_name@..._addr scheme in livepatch sysfs directory

+++ Jiri Kosina [01/11/15 10:07 +0100]:
>On Sat, 31 Oct 2015, Chris J Arges wrote:
>
>> Makes sense to me. Is there a reason why the sysfs entries are visible
>> to non-root users?
>
>Well, kptr_restrict applies only to values printed using '%pK'. So if the
>sysfs handler is using other printk() format string to print the pointer,
>it'll be leaked out (and should eventually be fixed).

Hm, I think the func.n solution might be a good temporary fix for now.
Even if we do go with func@...r and use the '%pK' format specifier we
will run into the same problem at kptr_restrict == 2.

Jessica
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