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From Nicolas Lécureuil <nicolas.lecure...@siveo.net>
Subject Re: Segfault with guacamole 0.9.14
Date Wed, 27 Jun 2018 14:20:27 GMT
> Le 27 juin 2018 à 16:11, Nick Couchman <vnick@apache.org> a écrit :
> 
> 
> 
>     On Wed, Jun 27, 2018 at 10:01 AM Nicolas Lécureuil <nicolas.lecureuil@siveo.net
mailto:nicolas.lecureuil@siveo.net > wrote:
> 
>         > > 
> >         Hi,
> > 
> >         i rebuilded guacd 0.9.14 ( using my own build debs )
> > 
> >         # dpkg -l | grep guac
> >         ii  guacamole                               0.9.14-4                   
                all          HTML5 web application for accessing remote desktops
> >         ii  guacamole-auth-mysql                    0.9.14-1                   
                all          Guacamole Mysql Identification
> >         ii  guacd                                   0.9.14-1                   
                amd64        HTML5 web application for accessing remote desktops (proxy daemon)
> >         ii  guacd-dbgsym                            0.9.14-1                   
                amd64        Debug symbols for guacd
> >         ii  libguac-client-rdp0:amd64               0.9.14-1                   
                amd64        HTML5 web application for accessing remote desktops (RDP support)
> >         ii  libguac-client-rdp0-dbgsym:amd64        0.9.14-1                   
                amd64        Debug symbols for libguac-client-rdp0
> >         ii  libguac-client-ssh0:amd64               0.9.14-1                   
                amd64        HTML5 web application for accessing remote desktops (SSH support)
> >         ii  libguac-client-ssh0-dbgsym:amd64        0.9.14-1                   
                amd64        Debug symbols for libguac-client-ssh0
> >         ii  libguac-client-vnc0:amd64               0.9.14-1                   
                amd64        HTML5 web application for accessing remote desktops (VNC support)
> >         ii  libguac-client-vnc0-dbgsym:amd64        0.9.14-1                   
                amd64        Debug symbols for libguac-client-vnc0
> >         ii  libguac-dev:amd64                       0.9.14-1                   
                amd64        Guacamole proxy daemon (core library headers)
> >         ii  libguac11:amd64                         0.9.14-1                   
                amd64        HTML5 web application for accessing remote desktops (library)
> >         ii  libguac11-dbgsym:amd64                  0.9.14-1                   
                amd64        Debug symbols for libguac11
> > 
> >     > 
>     What version of the libvncserver/libvncclient are you building against? 
> 
>         > > 
> > 
> > 
> >         Each time i use the vnc plugin i can see a segfault in the logs.
> > 
> >         Jun 27 14:48:28 pulsemaster kernel: [712278.556955] guacd[25572]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:49:35 pulsemaster kernel: [712345.817333] guacd[25612]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:50:41 pulsemaster kernel: [712412.051393] guacd[25655]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:51:47 pulsemaster kernel: [712477.883688] guacd[25700]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:52:54 pulsemaster kernel: [712544.755122] guacd[25746]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:54:03 pulsemaster kernel: [712613.432083] guacd[25794]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:55:08 pulsemaster kernel: [712678.871467] guacd[25836]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:55:29 pulsemaster kernel: [712699.432836] guacd[25883]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:57:39 pulsemaster kernel: [712829.633618] guacd[26029]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:58:35 pulsemaster kernel: [712885.994620] guacd[26072]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >         Jun 27 14:59:20 pulsemaster kernel: [712931.152907] guacd[26119]: segfault
at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > 
> >         I use a debian stretch.
> >         The vnc server is installed on a windows 10 ( TightVNC )
> > 
> >     >     Any special configuration for VNC?  Are you trying to use encryption?
 Anything else different about your VNC server configuration?  Have you tried against other
VNC servers on other target?
> 
>     -Nick 
> 

> 
> 
>     What version of the libvncserver/libvncclient are you building against?
> 

# dpkg -l | grep vncclient
ii libvncclient1:amd64 0.9.11+dfsg-1+deb9u1 amd64 API to write one's own VNC server - client
library

> 
>     Any special configuration for VNC? 
> 


for the client, this is nothing special


> 
>     Are you trying to use encryption? 
> 

No encryption


> 
>     Anything else different about your VNC server configuration? 
> 

no password, trought reverse ssh with ssh-key without passphrase


> 
>     Have you tried against other VNC servers on other target?
> 

No, only tightvnc as this is the plugin we use on our software


in the logs i can see:

Jun 27 16:10:31 pulsemaster guacd[24552]: Creating new client for protocol "vnc"
Jun 27 16:10:31 pulsemaster guacd[24552]: Connection ID is "$2b73afc9-4268-4f26-8942-5ddf0024536c"
Jun 27 16:10:31 pulsemaster guacd[29002]: Cursor rendering: local
Jun 27 16:10:31 pulsemaster guacd[29002]: User "@ae1d47fe-24e6-4557-ad07-2178e528524f" joined
connection "$2b73afc9-4268-4f26-8942-5ddf0024536c" (1 users now present)
Jun 27 16:10:31 pulsemaster guacd[29002]: Listening for connections on port 65408
Jun 27 16:10:31 pulsemaster guacd[29002]: -listennofork: Listening on port 65408
Jun 27 16:10:31 pulsemaster guacd[29002]: -listennofork: Command line errors are not reported
until a connection comes in.
Jun 27 16:10:34 pulsemaster guacd[28941]: User is not responding.
Jun 27 16:10:34 pulsemaster guacd[24552]: Connection "$12c5328c-c127-453d-bc9c-f631bf8e90f8"
removed.
Jun 27 16:10:34 pulsemaster kernel: [717204.421339] guacd[28944]: segfault at 10 ip 00007f9ead26c692
sp 00007f9eaec7ad10 error 4 in libguac-client-vnc.so.0.0.0[7f9ead264000+13000]

 Cordialement,

Nicolas Lécureuil

Web: http://www.siveo.net

 

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