![Linus Torvalds](/assets/img/avatar_default.png)
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
646 lines
18 KiB
C
646 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* devices.c
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* (C) Copyright 1999 Randy Dunlap.
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* (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>.
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* (proc file per device)
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* (C) Copyright 1999 Deti Fliegl (new USB architecture)
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*
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*************************************************************
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*
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* <mountpoint>/devices contains USB topology, device, config, class,
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* interface, & endpoint data.
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*
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* I considered using /dev/bus/usb/device# for each device
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* as it is attached or detached, but I didn't like this for some
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* reason -- maybe it's just too deep of a directory structure.
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* I also don't like looking in multiple places to gather and view
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* the data. Having only one file for ./devices also prevents race
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* conditions that could arise if a program was reading device info
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* for devices that are being removed (unplugged). (That is, the
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* program may find a directory for devnum_12 then try to open it,
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* but it was just unplugged, so the directory is now deleted.
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* But programs would just have to be prepared for situations like
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* this in any plug-and-play environment.)
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*
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* 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch>
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* Converted the whole proc stuff to real
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* read methods. Now not the whole device list needs to fit
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* into one page, only the device list for one bus.
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* Added a poll method to /sys/kernel/debug/usb/devices, to wake
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* up an eventual usbd
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* 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch>
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* Turned into its own filesystem
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* 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk>
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* Converted file reading routine to dump to buffer once
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* per device, not per bus
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/gfp.h>
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#include <linux/poll.h>
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#include <linux/usb.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/usb/hcd.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include "usb.h"
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/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
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#define ALLOW_SERIAL_NUMBER
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static const char format_topo[] =
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/* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */
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"\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n";
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static const char format_string_manufacturer[] =
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/* S: Manufacturer=xxxx */
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"S: Manufacturer=%.100s\n";
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static const char format_string_product[] =
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/* S: Product=xxxx */
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"S: Product=%.100s\n";
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#ifdef ALLOW_SERIAL_NUMBER
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static const char format_string_serialnumber[] =
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/* S: SerialNumber=xxxx */
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"S: SerialNumber=%.100s\n";
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#endif
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static const char format_bandwidth[] =
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/* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */
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"B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n";
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static const char format_device1[] =
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/* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */
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"D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n";
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static const char format_device2[] =
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/* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */
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"P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n";
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static const char format_config[] =
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/* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */
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"C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n";
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static const char format_iad[] =
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/* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */
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"A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n";
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static const char format_iface[] =
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/* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/
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"I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n";
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static const char format_endpt[] =
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/* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */
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"E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n";
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/*
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* Wait for an connect/disconnect event to happen. We initialize
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* the event counter with an odd number, and each event will increment
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* the event counter by two, so it will always _stay_ odd. That means
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* that it will never be zero, so "event 0" will never match a current
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* event, and thus 'poll' will always trigger as readable for the first
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* time it gets called.
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*/
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static struct device_connect_event {
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atomic_t count;
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wait_queue_head_t wait;
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} device_event = {
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.count = ATOMIC_INIT(1),
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.wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait)
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};
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struct class_info {
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int class;
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char *class_name;
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};
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static const struct class_info clas_info[] = {
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/* max. 5 chars. per name string */
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{USB_CLASS_PER_INTERFACE, ">ifc"},
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{USB_CLASS_AUDIO, "audio"},
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{USB_CLASS_COMM, "comm."},
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{USB_CLASS_HID, "HID"},
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{USB_CLASS_PHYSICAL, "PID"},
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{USB_CLASS_STILL_IMAGE, "still"},
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{USB_CLASS_PRINTER, "print"},
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{USB_CLASS_MASS_STORAGE, "stor."},
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{USB_CLASS_HUB, "hub"},
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{USB_CLASS_CDC_DATA, "data"},
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{USB_CLASS_CSCID, "scard"},
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{USB_CLASS_CONTENT_SEC, "c-sec"},
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{USB_CLASS_VIDEO, "video"},
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{USB_CLASS_WIRELESS_CONTROLLER, "wlcon"},
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{USB_CLASS_MISC, "misc"},
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{USB_CLASS_APP_SPEC, "app."},
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{USB_CLASS_VENDOR_SPEC, "vend."},
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{-1, "unk."} /* leave as last */
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};
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/*****************************************************************/
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void usbfs_conn_disc_event(void)
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{
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atomic_add(2, &device_event.count);
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wake_up(&device_event.wait);
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}
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static const char *class_decode(const int class)
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{
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int ix;
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for (ix = 0; clas_info[ix].class != -1; ix++)
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if (clas_info[ix].class == class)
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break;
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return clas_info[ix].class_name;
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}
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static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
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const struct usb_endpoint_descriptor *desc)
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{
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char dir, unit, *type;
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unsigned interval, bandwidth = 1;
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if (start > end)
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return start;
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dir = usb_endpoint_dir_in(desc) ? 'I' : 'O';
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if (speed == USB_SPEED_HIGH)
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bandwidth = usb_endpoint_maxp_mult(desc);
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/* this isn't checking for illegal values */
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switch (usb_endpoint_type(desc)) {
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case USB_ENDPOINT_XFER_CONTROL:
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type = "Ctrl";
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if (speed == USB_SPEED_HIGH) /* uframes per NAK */
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interval = desc->bInterval;
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else
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interval = 0;
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dir = 'B'; /* ctrl is bidirectional */
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break;
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case USB_ENDPOINT_XFER_ISOC:
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type = "Isoc";
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interval = 1 << (desc->bInterval - 1);
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break;
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case USB_ENDPOINT_XFER_BULK:
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type = "Bulk";
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if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
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interval = desc->bInterval;
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else
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interval = 0;
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break;
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case USB_ENDPOINT_XFER_INT:
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type = "Int.";
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if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER)
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interval = 1 << (desc->bInterval - 1);
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else
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interval = desc->bInterval;
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break;
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default: /* "can't happen" */
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return start;
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}
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interval *= (speed == USB_SPEED_HIGH ||
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speed >= USB_SPEED_SUPER) ? 125 : 1000;
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if (interval % 1000)
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unit = 'u';
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else {
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unit = 'm';
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interval /= 1000;
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}
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start += sprintf(start, format_endpt, desc->bEndpointAddress, dir,
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desc->bmAttributes, type,
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usb_endpoint_maxp(desc) *
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bandwidth,
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interval, unit);
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return start;
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}
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static char *usb_dump_interface_descriptor(char *start, char *end,
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const struct usb_interface_cache *intfc,
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const struct usb_interface *iface,
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int setno)
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{
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const struct usb_interface_descriptor *desc;
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const char *driver_name = "";
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int active = 0;
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if (start > end)
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return start;
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desc = &intfc->altsetting[setno].desc;
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if (iface) {
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driver_name = (iface->dev.driver
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? iface->dev.driver->name
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: "(none)");
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active = (desc == &iface->cur_altsetting->desc);
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}
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start += sprintf(start, format_iface,
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active ? '*' : ' ', /* mark active altsetting */
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desc->bInterfaceNumber,
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desc->bAlternateSetting,
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desc->bNumEndpoints,
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desc->bInterfaceClass,
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class_decode(desc->bInterfaceClass),
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desc->bInterfaceSubClass,
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desc->bInterfaceProtocol,
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driver_name);
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return start;
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}
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static char *usb_dump_interface(int speed, char *start, char *end,
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const struct usb_interface_cache *intfc,
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const struct usb_interface *iface, int setno)
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{
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const struct usb_host_interface *desc = &intfc->altsetting[setno];
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int i;
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start = usb_dump_interface_descriptor(start, end, intfc, iface, setno);
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for (i = 0; i < desc->desc.bNumEndpoints; i++) {
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if (start > end)
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return start;
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start = usb_dump_endpoint_descriptor(speed,
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start, end, &desc->endpoint[i].desc);
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}
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return start;
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}
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static char *usb_dump_iad_descriptor(char *start, char *end,
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const struct usb_interface_assoc_descriptor *iad)
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{
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if (start > end)
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return start;
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start += sprintf(start, format_iad,
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iad->bFirstInterface,
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iad->bInterfaceCount,
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iad->bFunctionClass,
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class_decode(iad->bFunctionClass),
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iad->bFunctionSubClass,
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iad->bFunctionProtocol);
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return start;
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}
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/* TBD:
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* 0. TBDs
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* 1. marking active interface altsettings (code lists all, but should mark
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* which ones are active, if any)
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*/
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static char *usb_dump_config_descriptor(char *start, char *end,
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const struct usb_config_descriptor *desc,
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int active, int speed)
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{
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int mul;
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if (start > end)
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return start;
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if (speed >= USB_SPEED_SUPER)
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mul = 8;
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else
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mul = 2;
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start += sprintf(start, format_config,
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/* mark active/actual/current cfg. */
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active ? '*' : ' ',
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desc->bNumInterfaces,
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desc->bConfigurationValue,
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desc->bmAttributes,
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desc->bMaxPower * mul);
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return start;
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}
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static char *usb_dump_config(int speed, char *start, char *end,
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const struct usb_host_config *config, int active)
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{
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int i, j;
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struct usb_interface_cache *intfc;
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struct usb_interface *interface;
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if (start > end)
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return start;
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if (!config)
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/* getting these some in 2.3.7; none in 2.3.6 */
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return start + sprintf(start, "(null Cfg. desc.)\n");
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start = usb_dump_config_descriptor(start, end, &config->desc, active,
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speed);
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for (i = 0; i < USB_MAXIADS; i++) {
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if (config->intf_assoc[i] == NULL)
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break;
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start = usb_dump_iad_descriptor(start, end,
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config->intf_assoc[i]);
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}
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for (i = 0; i < config->desc.bNumInterfaces; i++) {
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intfc = config->intf_cache[i];
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interface = config->interface[i];
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for (j = 0; j < intfc->num_altsetting; j++) {
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if (start > end)
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return start;
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start = usb_dump_interface(speed,
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start, end, intfc, interface, j);
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}
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}
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return start;
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}
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/*
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* Dump the different USB descriptors.
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*/
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static char *usb_dump_device_descriptor(char *start, char *end,
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const struct usb_device_descriptor *desc)
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{
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u16 bcdUSB = le16_to_cpu(desc->bcdUSB);
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u16 bcdDevice = le16_to_cpu(desc->bcdDevice);
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if (start > end)
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return start;
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start += sprintf(start, format_device1,
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bcdUSB >> 8, bcdUSB & 0xff,
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desc->bDeviceClass,
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class_decode(desc->bDeviceClass),
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desc->bDeviceSubClass,
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desc->bDeviceProtocol,
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desc->bMaxPacketSize0,
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desc->bNumConfigurations);
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if (start > end)
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return start;
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start += sprintf(start, format_device2,
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le16_to_cpu(desc->idVendor),
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le16_to_cpu(desc->idProduct),
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bcdDevice >> 8, bcdDevice & 0xff);
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return start;
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}
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/*
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* Dump the different strings that this device holds.
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*/
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static char *usb_dump_device_strings(char *start, char *end,
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struct usb_device *dev)
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{
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if (start > end)
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return start;
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if (dev->manufacturer)
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start += sprintf(start, format_string_manufacturer,
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dev->manufacturer);
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if (start > end)
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goto out;
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if (dev->product)
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start += sprintf(start, format_string_product, dev->product);
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if (start > end)
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goto out;
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#ifdef ALLOW_SERIAL_NUMBER
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if (dev->serial)
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start += sprintf(start, format_string_serialnumber,
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dev->serial);
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#endif
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out:
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return start;
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}
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static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
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{
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int i;
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if (start > end)
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return start;
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start = usb_dump_device_descriptor(start, end, &dev->descriptor);
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if (start > end)
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return start;
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start = usb_dump_device_strings(start, end, dev);
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for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
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if (start > end)
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return start;
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start = usb_dump_config(dev->speed,
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start, end, dev->config + i,
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/* active ? */
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(dev->config + i) == dev->actconfig);
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}
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return start;
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}
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#ifdef PROC_EXTRA /* TBD: may want to add this code later */
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static char *usb_dump_hub_descriptor(char *start, char *end,
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const struct usb_hub_descriptor *desc)
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{
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int leng = USB_DT_HUB_NONVAR_SIZE;
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unsigned char *ptr = (unsigned char *)desc;
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if (start > end)
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return start;
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start += sprintf(start, "Interface:");
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while (leng && start <= end) {
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start += sprintf(start, " %02x", *ptr);
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ptr++; leng--;
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}
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*start++ = '\n';
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return start;
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}
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static char *usb_dump_string(char *start, char *end,
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const struct usb_device *dev, char *id, int index)
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{
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if (start > end)
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return start;
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start += sprintf(start, "Interface:");
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if (index <= dev->maxstring && dev->stringindex &&
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dev->stringindex[index])
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start += sprintf(start, "%s: %.100s ", id,
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dev->stringindex[index]);
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return start;
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}
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#endif /* PROC_EXTRA */
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/*****************************************************************/
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/* This is a recursive function. Parameters:
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* buffer - the user-space buffer to write data into
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* nbytes - the maximum number of bytes to write
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* skip_bytes - the number of bytes to skip before writing anything
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* file_offset - the offset into the devices file on completion
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* The caller must own the device lock.
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*/
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static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
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loff_t *skip_bytes, loff_t *file_offset,
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struct usb_device *usbdev, struct usb_bus *bus,
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int level, int index, int count)
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{
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int chix;
|
|
int ret, cnt = 0;
|
|
int parent_devnum = 0;
|
|
char *pages_start, *data_end, *speed;
|
|
unsigned int length;
|
|
ssize_t total_written = 0;
|
|
struct usb_device *childdev = NULL;
|
|
|
|
/* don't bother with anything else if we're not writing any data */
|
|
if (*nbytes <= 0)
|
|
return 0;
|
|
|
|
if (level > MAX_TOPO_LEVEL)
|
|
return 0;
|
|
/* allocate 2^1 pages = 8K (on i386);
|
|
* should be more than enough for one device */
|
|
pages_start = (char *)__get_free_pages(GFP_NOIO, 1);
|
|
if (!pages_start)
|
|
return -ENOMEM;
|
|
|
|
if (usbdev->parent && usbdev->parent->devnum != -1)
|
|
parent_devnum = usbdev->parent->devnum;
|
|
/*
|
|
* So the root hub's parent is 0 and any device that is
|
|
* plugged into the root hub has a parent of 0.
|
|
*/
|
|
switch (usbdev->speed) {
|
|
case USB_SPEED_LOW:
|
|
speed = "1.5"; break;
|
|
case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */
|
|
case USB_SPEED_FULL:
|
|
speed = "12"; break;
|
|
case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */
|
|
case USB_SPEED_HIGH:
|
|
speed = "480"; break;
|
|
case USB_SPEED_SUPER:
|
|
speed = "5000"; break;
|
|
case USB_SPEED_SUPER_PLUS:
|
|
speed = "10000"; break;
|
|
default:
|
|
speed = "??";
|
|
}
|
|
data_end = pages_start + sprintf(pages_start, format_topo,
|
|
bus->busnum, level, parent_devnum,
|
|
index, count, usbdev->devnum,
|
|
speed, usbdev->maxchild);
|
|
/*
|
|
* level = topology-tier level;
|
|
* parent_devnum = parent device number;
|
|
* index = parent's connector number;
|
|
* count = device count at this level
|
|
*/
|
|
/* If this is the root hub, display the bandwidth information */
|
|
if (level == 0) {
|
|
int max;
|
|
|
|
/* super/high speed reserves 80%, full/low reserves 90% */
|
|
if (usbdev->speed == USB_SPEED_HIGH ||
|
|
usbdev->speed >= USB_SPEED_SUPER)
|
|
max = 800;
|
|
else
|
|
max = FRAME_TIME_MAX_USECS_ALLOC;
|
|
|
|
/* report "average" periodic allocation over a microsecond.
|
|
* the schedules are actually bursty, HCDs need to deal with
|
|
* that and just compute/report this average.
|
|
*/
|
|
data_end += sprintf(data_end, format_bandwidth,
|
|
bus->bandwidth_allocated, max,
|
|
(100 * bus->bandwidth_allocated + max / 2)
|
|
/ max,
|
|
bus->bandwidth_int_reqs,
|
|
bus->bandwidth_isoc_reqs);
|
|
|
|
}
|
|
data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256,
|
|
usbdev);
|
|
|
|
if (data_end > (pages_start + (2 * PAGE_SIZE) - 256))
|
|
data_end += sprintf(data_end, "(truncated)\n");
|
|
|
|
length = data_end - pages_start;
|
|
/* if we can start copying some data to the user */
|
|
if (length > *skip_bytes) {
|
|
length -= *skip_bytes;
|
|
if (length > *nbytes)
|
|
length = *nbytes;
|
|
if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) {
|
|
free_pages((unsigned long)pages_start, 1);
|
|
return -EFAULT;
|
|
}
|
|
*nbytes -= length;
|
|
*file_offset += length;
|
|
total_written += length;
|
|
*buffer += length;
|
|
*skip_bytes = 0;
|
|
} else
|
|
*skip_bytes -= length;
|
|
|
|
free_pages((unsigned long)pages_start, 1);
|
|
|
|
/* Now look at all of this device's children. */
|
|
usb_hub_for_each_child(usbdev, chix, childdev) {
|
|
usb_lock_device(childdev);
|
|
ret = usb_device_dump(buffer, nbytes, skip_bytes,
|
|
file_offset, childdev, bus,
|
|
level + 1, chix - 1, ++cnt);
|
|
usb_unlock_device(childdev);
|
|
if (ret == -EFAULT)
|
|
return total_written;
|
|
total_written += ret;
|
|
}
|
|
return total_written;
|
|
}
|
|
|
|
static ssize_t usb_device_read(struct file *file, char __user *buf,
|
|
size_t nbytes, loff_t *ppos)
|
|
{
|
|
struct usb_bus *bus;
|
|
ssize_t ret, total_written = 0;
|
|
loff_t skip_bytes = *ppos;
|
|
int id;
|
|
|
|
if (*ppos < 0)
|
|
return -EINVAL;
|
|
if (nbytes <= 0)
|
|
return 0;
|
|
if (!access_ok(buf, nbytes))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&usb_bus_idr_lock);
|
|
/* print devices for all busses */
|
|
idr_for_each_entry(&usb_bus_idr, bus, id) {
|
|
/* recurse through all children of the root hub */
|
|
if (!bus_to_hcd(bus)->rh_registered)
|
|
continue;
|
|
usb_lock_device(bus->root_hub);
|
|
ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos,
|
|
bus->root_hub, bus, 0, 0, 0);
|
|
usb_unlock_device(bus->root_hub);
|
|
if (ret < 0) {
|
|
mutex_unlock(&usb_bus_idr_lock);
|
|
return ret;
|
|
}
|
|
total_written += ret;
|
|
}
|
|
mutex_unlock(&usb_bus_idr_lock);
|
|
return total_written;
|
|
}
|
|
|
|
/* Kernel lock for "lastev" protection */
|
|
static __poll_t usb_device_poll(struct file *file,
|
|
struct poll_table_struct *wait)
|
|
{
|
|
unsigned int event_count;
|
|
|
|
poll_wait(file, &device_event.wait, wait);
|
|
|
|
event_count = atomic_read(&device_event.count);
|
|
if (file->f_version != event_count) {
|
|
file->f_version = event_count;
|
|
return EPOLLIN | EPOLLRDNORM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations usbfs_devices_fops = {
|
|
.llseek = no_seek_end_llseek,
|
|
.read = usb_device_read,
|
|
.poll = usb_device_poll,
|
|
};
|