linux-kernel - Re: loading firmware while usermodehelper disabled.

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:	Sun, 1 Jan 2012 21:50:00 +0100
From:	Michael Büsch <m@...s.ch>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Marek Vasut <marek.vasut@...il.com>,
	Oliver Neukum <oliver@...kum.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	"John W. Linville" <linville@...driver.com>,
	Matthew Garrett <mjg@...hat.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.

On Sun, 1 Jan 2012 20:39:45 +0000
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> When you suspend the power gets killed so the device loses its firmware
> and goes back to being a firmware requesting thing on resume.
> 
> Worse still - you don't easily know if the device is in fact new and was
> added while suspended, or was always there.
> 
> So for those devices you do need to load the firmware into them
> automatically after the resume to work out what they are and get the MAC
> to see if its the same wireless card or not.

Well, that does not prevent you from caching the firmware once you
got it from userspace and keep it until module unload (or probably device
close), so that it is already available on resume.

-- 
Greetings, Michael.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/