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  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:   Mon, 18 Feb 2019 10:32:57 +0000
From:   Nix <nix@...eri.org.uk>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg KH <greg@...ah.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: 4.20.7: pl2303 not working (post-4.19 regression) (limited info so far, not yet bisected)

On 18 Feb 2019, Johan Hovold stated:

> On Sun, Feb 17, 2019 at 07:13:52PM +0000, Nix wrote:
>> I'm still fairly sure this is a regression -- my machines are often up
>> for a lot longer than that and I've never seen this before I upgraded to
>> 4.20.x -- but I don't think I'm going to identify it by mindless
>> bisection. I might have to actually *think* about it.
>
> I doubt it's a regression in usb-serial as essentially nothing changed
> with respect to pl2303 or core since 4.19.

Yeah, I came to that conclusion as well.

> The -ENOSPC you're seeing is returned by the host controller to
> indicate:
>
> 	This request would overcommit the usb bandwidth reserved for
> 	periodic transfers (interrupt, isochronous).

Side note: probably not related to *this* -ENOSPC, which I've been
seeing for a few releases now and which appears to break Chromium's U2F
negotiation when the USB bus has sufficiently weird devices on it (like,
uh, my wireless mouse):

<https://bugs.chromium.org/p/chromium/issues/detail?id=932699>

(I say "probably not related" because it's much older and long predates
the pl2303 trouble.)

> but if you're saying you can reproduce this on "every box" it may not be
> related to any particular host-controller driver (or USB topology).

They are all xhci, at least. The pl2303 is USB 2. One machine, a
two-year-old Broadwell server, says:

xhci_hcd 0000:00:14.0: xHCI Host Controller
xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 3
xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci version 0x100 quirks 0x0000000000009810
xhci_hcd 0000:00:14.0: cache line size of 32 is not supported
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 15 ports detected
xhci_hcd 0000:00:14.0: xHCI Host Controller
xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 4
xhci_hcd 0000:00:14.0: Host supports USB 3.0  SuperSpeed

00:14.0 USB controller: Intel Corporation C610/X99 series chipset USB xHCI Host Controller (rev 05) (prog-if 30 [XHCI])

The other, a 2012-era cheapish Ivy Bridge workstation:

xhci_hcd 0000:03:00.0: xHCI Host Controller
xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 3
xhci_hcd 0000:03:00.0: hcc params 0x014042cb hci version 0x96 quirks 0x0000000000000004
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
xhci_hcd 0000:03:00.0: xHCI Host Controller
xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 4
xhci_hcd 0000:03:00.0: Host supports USB 3.0  SuperSpeed
usb usb4: We don't know the algorithms for LPM for this host, disabling LPM.
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
xhci_hcd 0000:04:00.0: xHCI Host Controller
xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 5
xhci_hcd 0000:04:00.0: hcc params 0x0200f180 hci version 0x96 quirks 0x0000000000080000
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 2 ports detected
xhci_hcd 0000:04:00.0: xHCI Host Controller
xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 6
xhci_hcd 0000:04:00.0: Host supports USB 3.0  SuperSpeed
usb usb6: We don't know the algorithms for LPM for this host, disabling LPM.

03:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30 [XHCI])
04:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller (prog-if 30 [XHCI])

(I really don't know which of these is which. I suspect only one
actually has any visible ports on the outside of the case...)

So the quirks are all totally different, and the controllers are quite
different as well...

Powered by blists - more mailing lists