linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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, 14 Apr 2010 14:53:20 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pedro Ribeiro <pedrib@...il.com>
cc:	Daniel Mack <daniel@...aq.de>,
	David Woodhouse <dwmw2@...radead.org>,
	USB list <linux-usb@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Wed, 14 Apr 2010, Pedro Ribeiro wrote:

> On 14 April 2010 19:23, Alan Stern <stern@...land.harvard.edu> wrote:
> > On Wed, 14 Apr 2010, Pedro Ribeiro wrote:
> >
> >> The best way to trigger the issue is to connect a dib0700 based DVB
> >> adapter. All you need is to connect it. Since it polls for the remote
> >> control every 50 msec, it causes a constant interference. Beware that
> >> on 2.6.34 this behaviour has been corrected. Other DVB adapters may
> >> trigger the same issue if they also poll constatly for the rc.
> >
> > Your computer has two EHCI controllers, doesn't it?  Can you plug the
> > DVB into a different USB bus from the audio device?  If you do, does
> > the interference still occur?
> >
> > Alan Stern
> >
> >
> 
> It does not matter on which ports I plug into, even if in different
> buses not sharing IRQ's.

Okay, good.  That's important.  If the problem went away when the two
devices were on separate buses then it would have to be a bug in
ehci-hcd.  But since it didn't go away, it must be a bug in the
memory/buffering code or in the hardware.

Alan Stern

--
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/