linux-kernel - [PATCH 0/2] restrict statistics information to user

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Message-Id: <1308917274-4701-1-git-send-email-segoon@openwall.com>
Date:	Fri, 24 Jun 2011 16:07:54 +0400
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	linux-kernel@...r.kernel.org
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Rientjes <rientjes@...gle.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	security@...nel.org, Eric Paris <eparis@...hat.com>,
	Solar Designer <solar@...nwall.com>
Subject: [PATCH 0/2] restrict statistics information to user

taskstats and /proc/PID/io may be used for gathering private
information.  E.g. for openssh and vsftpd daemons wchars/rchars may be
used to learn the precise password length (pass_len = w_chars - CONST).
Restrict it to user.

The simplified proof learning whether ~*/.ssh/authorized_keys file
exists is posted here:
http://www.openwall.com/lists/oss-security/2011/06/21/12

Vasiliy Kulikov (2):
  proc: restrict access to /proc/PID/io
  taskstats: restrict access to user

 fs/proc/base.c     |    7 +++++--
 kernel/taskstats.c |   23 ++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 3 deletions(-)

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