https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7524
Summary: GSM classmark3 decode wrong
Product: Wireshark
Version: 1.8.0
Platform: x86
OS/Version: Windows 7
Status: NEW
Severity: Major
Priority: Low
Component: Dissection engine (libwireshark)
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: dingli2001@xxxxxxxx
Created attachment 8839
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8839
pcap file contain 8-PSK Struct
Build Information:
wireshark 1.8.0 (SVN Rev 43431 from /trunk-1.8)
Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> 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 (32-bit) with GTK+ 2.24.10, with Cairo 1.10.2, with Pango 1.30.0, with
GLib 2.32.2, with WinPcap (4_1_2), with libz 1.2.5, without POSIX capabilities,
with SMI 0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS
2.12.18, with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built Jun 21 2012), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.12.18, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 10.0 build 40219
wireshark 1.8.0 (SVN Rev 43431 from /trunk-1.8)
Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> 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 (32-bit) with GTK+ 2.24.10, with Cairo 1.10.2, with Pango 1.30.0, with
GLib 2.32.2, with WinPcap (4_1_2), with libz 1.2.5, without POSIX capabilities,
with SMI 0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS
2.12.18, with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built Jun 21 2012), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.12.18, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 10.0 build 40219
--
when decode 8-PSK struct in classmark3,
gsm_a.classmark3.8_psk_rf_power_capability_1 and
gsm_a.classmark3.8_psk_rf_power_capability_2 isn't fixed length
it isn't presence when the first bit is 0
in spec 3gpp TS24.008 section 10.5.1.7
< 8-PSK Struct> : :=
< Modulation Capability : bit >
{ 0 | 1 < 8-PSK RF Power Capability 1: bit(2) > }
{ 0 | 1 < 8-PSK RF Power Capability 2: bit(2) > }
if the bits is 00001, should be decoded as:
Modulation Capability =0
8-PSK RF Power Capability 1 not presence
8-PSK RF Power Capability 2 not presence
and 01 should be used by following fields in classmark3
in current version ,it is decode:
Modulation Capability =0
8-PSK RF Power Capability 1 =00
8-PSK RF Power Capability 2 =01
this 8-PSK struct bug will eat more bits and cause all following fields are
decoded wrong
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