linux-kernel - Re: [PATCH] PM / hibernate: Introduce snapshot test mode for hibernation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 13 Jul 2016 11:50:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Chen Yu <yu.c.chen@...el.com>
Cc:	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / hibernate: Introduce snapshot test mode for
 hibernation

On Thu 2016-07-07 14:40:58, Chen Yu wrote:
> This mode is to verify if the snapshot data written to
> swap device can be successfully restored to memory. It
> is useful to ease the debugging process on hibernation,
> since this mode can not only bypass the BIOSen/bootloader,
> but also the system re-initialization.
> 
> For example:
> $ sudo echo snapshot > /sys/power/disk
> $ sudo echo disk > /sys/power/state
> 
> /* manual resume.*/
> $ sudo echo 8:3 > /sys/power/resume

Your examples will not work, will they?

This is also quite tricky/dangerous. If you do this with filesystems
mounted R/W, it is "good bye, filesystems".

I guess updating documentation would be welcome from my side,
otherwise it should be ok.

Acked-by: Pavel Machek <pavel@....cz>

Best regards,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html