linux-kernel - [PATCH v2 0/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation

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Date:	Sun, 21 Jun 2015 13:20:31 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, Neil Brown <neilb@...e.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>
Cc:	dm-devel@...hat.com, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH v2 0/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation

This patch series increase security of suspend and hibernate actions. It allows
user to safely wipe crypto keys before suspend and hibernate actions starts
without race conditions on userspace process with heavy I/O.

To automatically wipe cryto key for <device> before hibernate action call:
$ dmsetup message <device> 0 key wipe_on_hibernation

To automatically wipe cryto key for <device> before suspend action call:
$ dmsetup message <device> 0 key wipe_on_suspend

To disable automatic wipe call retain_on_suspend/retain_on_hibernation.

Pali Rohár (3):
  PM suspend/hibernate: Call notifier after freezing processes
  dm: Export function dm_suspend_md()
  dm-crypt: Adds support for wiping key when doing suspend/hibernation

 drivers/md/dm-crypt.c    |  126 +++++++++++++++++++++++++++++++++++++++++++---
 drivers/md/dm.c          |    6 +++
 drivers/md/dm.h          |    5 ++
 include/linux/suspend.h  |    2 +
 kernel/power/hibernate.c |    2 +
 kernel/power/suspend.c   |    4 +-
 6 files changed, 136 insertions(+), 9 deletions(-)

-- 
1.7.9.5

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