linux-kernel - Re: [linux-pm] Re: Hibernation considerations

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]

Message-Id: <200707212120.04645.rjw@sisk.pl>
Date:	Sat, 21 Jul 2007 21:20:03 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	jbms@....edu, nigel@...el.suspend2.net, miltonm@....com,
	stern@...land.harvard.edu, ying.huang@...el.com,
	linux-kernel@...r.kernel.org, david@...g.hm,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] Re: Hibernation considerations

On Saturday, 21 July 2007 20:12, Miklos Szeredi wrote:
> > It seems that you could still potentially get a failure to freeze if one
> > FUSE process depends on another, and the one that is frozen second just
> > happens to be waiting on the one that is frozen first when it is frozen.
> > I admit that this situation is unlikely, and perhaps acceptable.
> 
> It isn't all that unlikely.  There's sshfs for example, that depends
> on a separate ssh process for transport.
> 
> Oh, there are also userspace network transports, like tun/tap,
> nfqueue, etc.  They could block any network filesystem (not just fuse)
> if frozen first, making the freezer fail.
> 
> Hmm, wonder why this isn't affecting people with VPNs?  Probably
> network mounts over VPN are rare, and ever rarer to have fs activity
> on them during suspend.
> 
> Anyway, I think it's long overdue to stop thinking about how to "fix"
> fuse, and concentrate on fixing the underlying problem instead ;)

To conclude this branch of the thread, I have a patch in the works that may
help a bit with unfreezable FUSE filesystems and it only affects the freezer.
I'll post it when 2.6.23-rc1 is out, because it's on top of some other patches
that need to go first.

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
-
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/