| Bug ID |
10825
|
| Summary |
USB HID report descriptor input elements decoded improperly
|
| Product |
Wireshark
|
| Version |
1.12.2
|
| Hardware |
x86-64
|
| OS |
Gentoo
|
| Status |
UNCONFIRMED
|
| Severity |
Major
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
[email protected]
|
| Reporter |
[email protected]
|
Build Information:
Version 1.12.2 (Git Rev Unknown from unknown)
Copyright 1998-2014 Gerald Combs <[email protected]> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) with GTK+ 3.12.2, with Cairo 1.12.16, with Pango 1.36.5, with
GLib 2.40.0, with libpcap, with libz 1.2.8, with POSIX capabilities (Linux),
with libnl 3, without SMI, without c-ares, without ADNS, without Lua, without
Python, with GnuTLS 2.12.23, with Gcrypt 1.5.4, without Kerberos, without
GeoIP,
without PortAudio, without AirPcap.
Running on Linux 3.17.7-gentoo, with locale en_CA.UTF-8, with libpcap version
1.6.2, with libz 1.2.8, GnuTLS 2.12.23, Gcrypt 1.5.4.
Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz
Built using gcc 4.8.3.
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
The bits in an Input main item (excluding the item header) in a USB HID report
descriptor are interpreted as if they were all exactly inverted. As an example,
the two bytes 0x81 0x02 (found in my mouse) decode as follows in Wireshark:
Main item (Input)
Header
.... ..01 = bSize: 1 byte (1)
.... 00.. = bType: Main (0)
1000 .... = bTag: Input (0x08)
.... .... 0 = Data/constant: Constant
.... ...1 . = Data type: Array
.... ..0. . = Coordinates: Relative
.... .0.. . = Min/max wraparound: Wrap
.... 0... . = Physical relationship to data: Nonlinear
...0 .... . = Preferred state: No preferred state
..0. .... . = Has null position: Null state
.0.. .... . = [Reserved]: False
Bits or bytes: Buffered bytes (default, no second byte present)
In actual fact, according to both the HID class specification and also basic
common sense, these bytes mean the exact opposite: an input main item of type
Data, Variable, Absolute, No Wrap, Linear, Preferred State, No Null Position,
Bit Field.
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