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USB: avoid urb->pipe in usbfs
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This patch (as948) removes most of the references to urb->pipe from
the usbfs routines in devio.c.  The one tricky aspect is in
snoop_urb(), which can be called before the URB is submitted and which
uses usb_urb_dir_in().  For this to work properly, the URB's direction
flag must be set manually in proc_do_submiturb().

The patch also fixes a minor bug; the wValue, wIndex, and wLength
fields were snooped in proc_do_submiturb() without conversion from
le16 to CPU-byte-ordering.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Alan Stern authored and Greg Kroah-Hartman committed Oct 12, 2007
1 parent 4326ed0 commit 93cf9b9
Showing 1 changed file with 41 additions and 28 deletions.
69 changes: 41 additions & 28 deletions drivers/usb/core/devio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -289,10 +289,8 @@ static void snoop_urb(struct urb *urb, void __user *userurb)
if (!usbfs_snoop)
return;

if (urb->pipe & USB_DIR_IN)
dev_info(&urb->dev->dev, "direction=IN\n");
else
dev_info(&urb->dev->dev, "direction=OUT\n");
dev_info(&urb->dev->dev, "direction=%s\n",
usb_urb_dir_in(urb) ? "IN" : "OUT");
dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
urb->transfer_buffer_length);
Expand Down Expand Up @@ -910,6 +908,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
struct usb_ctrlrequest *dr = NULL;
unsigned int u, totlen, isofrmlen;
int ret, ifnum = -1;
int is_in;

if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
URB_NO_FSBR|URB_ZERO_PACKET))
Expand All @@ -924,16 +923,18 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
if ((ret = checkintf(ps, ifnum)))
return ret;
}
if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
else
ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
is_in = 1;
ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
} else {
is_in = 0;
ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
}
if (!ep)
return -ENOENT;
switch(uurb->type) {
case USBDEVFS_URB_TYPE_CONTROL:
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_CONTROL)
if (!usb_endpoint_xfer_control(&ep->desc))
return -EINVAL;
/* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
Expand All @@ -952,23 +953,32 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
kfree(dr);
return ret;
}
uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
uurb->number_of_packets = 0;
uurb->buffer_length = le16_to_cpup(&dr->wLength);
uurb->buffer += 8;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
is_in = 1;
uurb->endpoint |= USB_DIR_IN;
} else {
is_in = 0;
uurb->endpoint &= ~USB_DIR_IN;
}
if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
uurb->buffer, uurb->buffer_length)) {
kfree(dr);
return -EFAULT;
}
snoop(&ps->dev->dev, "control urb: bRequest=%02x "
"bRrequestType=%02x wValue=%04x "
"wIndex=%04x wLength=%04x\n",
dr->bRequest, dr->bRequestType, dr->wValue,
dr->wIndex, dr->wLength);
dr->bRequest, dr->bRequestType,
__le16_to_cpup(&dr->wValue),
__le16_to_cpup(&dr->wIndex),
__le16_to_cpup(&dr->wLength));
break;

case USBDEVFS_URB_TYPE_BULK:
switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
switch (usb_endpoint_type(&ep->desc)) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_ISOC:
return -EINVAL;
Expand All @@ -977,7 +987,8 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
uurb->number_of_packets = 0;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
uurb->buffer, uurb->buffer_length))
return -EFAULT;
snoop(&ps->dev->dev, "bulk urb\n");
break;
Expand All @@ -986,8 +997,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
/* arbitrary limit */
if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
return -EINVAL;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_ISOC)
if (!usb_endpoint_xfer_isoc(&ep->desc))
return -EINVAL;
isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
Expand All @@ -1014,12 +1024,12 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,

case USBDEVFS_URB_TYPE_INTERRUPT:
uurb->number_of_packets = 0;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_INT)
if (!usb_endpoint_xfer_int(&ep->desc))
return -EINVAL;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
uurb->buffer, uurb->buffer_length))
return -EFAULT;
snoop(&ps->dev->dev, "interrupt urb\n");
break;
Expand All @@ -1039,8 +1049,11 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
return -ENOMEM;
}
as->urb->dev = ps->dev;
as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
as->urb->transfer_flags = uurb->flags;
as->urb->pipe = (uurb->type << 30) |
__create_pipe(ps->dev, uurb->endpoint & 0xf) |
(uurb->endpoint & USB_DIR_IN);
as->urb->transfer_flags = uurb->flags |
(is_in ? URB_DIR_IN : URB_DIR_OUT);
as->urb->transfer_buffer_length = uurb->buffer_length;
as->urb->setup_packet = (unsigned char*)dr;
as->urb->start_frame = uurb->start_frame;
Expand Down Expand Up @@ -1070,13 +1083,13 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
as->uid = current->uid;
as->euid = current->euid;
security_task_getsecid(current, &as->secid);
if (!(uurb->endpoint & USB_DIR_IN)) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
if (!is_in) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
as->urb->transfer_buffer_length)) {
free_async(as);
return -EFAULT;
}
}
snoop(&as->urb->dev->dev, "submit urb\n");
snoop_urb(as->urb, as->userurb);
async_newpending(as);
if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
Expand Down Expand Up @@ -1126,7 +1139,7 @@ static int processcompl(struct async *as, void __user * __user *arg)
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;

if (usb_pipeisoc(urb->pipe)) {
if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
Expand Down Expand Up @@ -1240,7 +1253,7 @@ static int processcompl_compat(struct async *as, void __user * __user *arg)
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;

if (usb_pipeisoc(urb->pipe)) {
if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
Expand Down

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