From: "Philippe Mathieu-Daudé" <philmd@linaro.org>
To: Cord Amfmgm <dmamfmgm@gmail.com>, Michael Tokarev <mjt@tls.msk.ru>
Cc: qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: hw/usb/hcd-ohci: Fix #1510, #303: pid not IN or OUT
Date: Wed, 8 May 2024 11:53:45 +0200 [thread overview]
Message-ID: <8dadea4d-ab16-4102-93e6-61559fb5b00c@linaro.org> (raw)
In-Reply-To: <CACBuX0SUvsip=hj5NbE3g5gCxSmdRKbK-k=ZQz819TDEfvtXgw@mail.gmail.com>
On 7/5/24 22:20, Cord Amfmgm wrote:
>
>
> On Wed, Apr 24, 2024 at 3:43 PM Cord Amfmgm <dmamfmgm@gmail.com
> <mailto:dmamfmgm@gmail.com>> wrote:
>
> On Thu, Apr 18, 2024 at 10:43 AM Michael Tokarev <mjt@tls.msk.ru
> <mailto:mjt@tls.msk.ru>> wrote:
>
> 06.02.2024 10:13, Cord Amfmgm wrote:
> > This changes the ohci validation to not assert if invalid
> > data is fed to the ohci controller. The poc suggested in
> > https://bugs.launchpad.net/qemu/+bug/1907042
> <https://bugs.launchpad.net/qemu/+bug/1907042>
> > and then migrated to bug #303 does the following to
> > feed it a SETUP pid and EndPt of 1:
> >
> > uint32_t MaxPacket = 64;
> > uint32_t TDFormat = 0;
> > uint32_t Skip = 0;
> > uint32_t Speed = 0;
> > uint32_t Direction = 0; /* #define
> OHCI_TD_DIR_SETUP 0 */
> > uint32_t EndPt = 1;
> > uint32_t FuncAddress = 0;
> > ed->attr = (MaxPacket << 16) | (TDFormat << 15) |
> (Skip << 14)
> > | (Speed << 13) | (Direction << 11) |
> (EndPt << 7)
> > | FuncAddress;
> > ed->tailp = /*TDQTailPntr= */ 0;
> > ed->headp = ((/*TDQHeadPntr= */ &td[0]) & 0xfffffff0)
> > | (/* ToggleCarry= */ 0 << 1);
> > ed->next_ed = (/* NextED= */ 0 & 0xfffffff0)
> >
> > qemu-fuzz also caught the same issue in #1510. They are
> > both fixed by this patch.
> >
> > The if (td.cbp > td.be <http://td.be>) logic in
> ohci_service_td() causes an
> > ohci_die(). My understanding of the OHCI spec 4.3.1.2
> > Table 4-2 allows td.cbp to be one byte more than td.be
> <http://td.be> to
> > signal the buffer has zero length. The new check in qemu
> > appears to have been added since qemu-4.2. This patch
> > includes both fixes since they are located very close
> > together.
> >
> > Signed-off-by: David Hubbard <dmamfmgm@gmail.com
> <mailto:dmamfmgm@gmail.com>>
>
> Wonder if this got lost somehow. Or is it not needed?
>
> Thanks,
>
> /mjt
>
>
> Friendly ping! Gerd, can you chime in with how you would like to
> approach this? I still need this patch to unblock my qemu workflow -
> custom OS development.
>
>
> Can I please ask for an update on this? I'm attempting to figure out if
> this patch has been rejected and I need to resubmit / rework it at HEAD?
>
>
> > diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
> > index d73b53f33c..a53808126f 100644
> > --- a/hw/usb/hcd-ohci.c
> > +++ b/hw/usb/hcd-ohci.c
> > @@ -927,6 +927,11 @@ static int ohci_service_td(OHCIState *ohci,
> > struct ohci_ed *ed)
> > case OHCI_TD_DIR_SETUP:
> > str = "setup";
> > pid = USB_TOKEN_SETUP;
> > + if (OHCI_BM(ed->flags, ED_EN) > 0) { /* setup only
> allowed to ep 0 */
> > + trace_usb_ohci_td_bad_pid(str, ed->flags, td.flags);
> > + ohci_die(ohci);
> > + return 1;
> > + }
> > break;
I made a comment on April 18 but it is not showing on the list...
https://lore.kernel.org/qemu-devel/593072d7-614b-4197-9c9a-12bb70c31d31@linaro.org/
It was:
> Please split in 2 different patches.
Even if closely related, it simplifies the workflow to have
single fix in single commit; for example if one is invalid,
we can revert it and not the other.
> > default:
> > trace_usb_ohci_td_bad_direction(dir);
> > @@ -936,8 +941,8 @@ static int ohci_service_td(OHCIState
> *ohci, struct
> > ohci_ed *ed)
> > if ((td.cbp & 0xfffff000) != (td.be <http://td.be>
> & 0xfffff000)) {
> > len = (td.be <http://td.be> & 0xfff) + 0x1001 -
> (td.cbp & 0xfff);
> > } else {
> > - if (td.cbp > td.be <http://td.be>) {
> > - trace_usb_ohci_iso_td_bad_cc_overrun(td.cbp,
> td.be <http://td.be>);
> > + if (td.cbp > td.be <http://td.be> + 1) {
> > + trace_usb_ohci_td_bad_buf(td.cbp, td.be
> <http://td.be>);
> > ohci_die(ohci);
> > return 1;
> > }
> > diff --git a/hw/usb/trace-events b/hw/usb/trace-events
> > index ed7dc210d3..b47d082fa3 100644
> > --- a/hw/usb/trace-events
> > +++ b/hw/usb/trace-events
> > @@ -28,6 +28,8 @@ usb_ohci_iso_td_data_overrun(int ret,
> ssize_t len)
> > "DataOverrun %d > %zu"
> > usb_ohci_iso_td_data_underrun(int ret) "DataUnderrun %d"
> > usb_ohci_iso_td_nak(int ret) "got NAK/STALL %d"
> > usb_ohci_iso_td_bad_response(int ret) "Bad device response %d"
> > +usb_ohci_td_bad_buf(uint32_t cbp, uint32_t be) "Bad cbp =
> 0x%x > be = 0x%x"
> > +usb_ohci_td_bad_pid(const char *s, uint32_t edf, uint32_t
> tdf) "Bad
> > pid %s: ed.flags 0x%x td.flags 0x%x"
> > usb_ohci_port_attach(int index) "port #%d"
> > usb_ohci_port_detach(int index) "port #%d"
> > usb_ohci_port_wakeup(int index) "port #%d"
> >
>
next prev parent reply other threads:[~2024-05-08 9:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-06 7:13 hw/usb/hcd-ohci: Fix #1510, #303: pid not IN or OUT Cord Amfmgm
2024-04-18 15:43 ` Michael Tokarev
2024-04-19 15:00 ` Cord Amfmgm
2024-04-24 20:43 ` Cord Amfmgm
2024-05-07 20:20 ` Cord Amfmgm
2024-05-08 8:44 ` Thomas Huth
2024-05-08 9:53 ` Philippe Mathieu-Daudé [this message]
2024-05-08 15:28 ` Cord Amfmgm
2024-05-09 0:32 ` Cord Amfmgm
2024-05-09 17:48 ` Peter Maydell
2024-05-09 18:16 ` Cord Amfmgm
2024-05-09 20:37 ` BALATON Zoltan
2024-05-10 7:08 ` Cord Amfmgm
2024-05-11 10:25 ` Peter Maydell
2024-05-12 16:24 ` Cord Amfmgm
-- strict thread matches above, loose matches on Subject: below --
2024-02-06 7:02 Cord Amfmgm
2024-02-06 7:05 ` Cord Amfmgm
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8dadea4d-ab16-4102-93e6-61559fb5b00c@linaro.org \
--to=philmd@linaro.org \
--cc=dmamfmgm@gmail.com \
--cc=kraxel@redhat.com \
--cc=mjt@tls.msk.ru \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).