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

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Message-ID: <alpine.LNX.2.00.1511010958430.17538@pobox.suse.cz>
Date:	Sun, 1 Nov 2015 10:07:14 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Chris J Arges <chris.j.arges@...onical.com>
cc:	Jessica Yu <jeyu@...hat.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

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).

Thanks,

-- 
Jiri Kosina
SUSE Labs

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