Re: [Libvncserver-common] buffer overflow...probably in libvncserver

[Christian B. <chr...@go...>]

Rob,

Would you be so kind a give me the exact libvncserver version as well?

Thanks,

   Christian

Am Tue, 31 May 2016 20:47:01 -0400
schrieb Rob <rp...@co...>:

> I use an ssh tunnel to connect to my desktops from a remote location.
> 
> commands are
> 
> /usr/bin/x11vnc -display :0.0 -ncache 0 -forever -rfbport 5900 -v 
> ~/.vnc0 2>&1 &
> /usr/bin/x11vnc -display :0.1 -ncache 0 -forever -rfbport 5901 -v 
> ~/.vnc0 2>&1 &
> 
> sometimes on the first connection...sometimes on the (n)th connection 
> either instance may core dump with
> 
> the VNC desktop is:      blackbox.localdomain:1
> PORT=5901
> *** buffer overflow detected ***: /usr/bin/x11vnc terminated
> ======= Backtrace: =========
> /lib64/libc.so.6(__fortify_fail+0x37)[0x7f768315b597]
> /lib64/libc.so.6(+0x10c750)[0x7f7683159750]
> /lib64/libc.so.6(+0x10e507)[0x7f768315b507]
> /lib64/libvncserver.so.0(rfbProcessNewConnection+0x114)[0x7f7685af7764]
> /lib64/libvncserver.so.0(rfbCheckFds+0x3f8)[0x7f7685af7c98]
> /lib64/libvncserver.so.0(rfbProcessEvents+0x1d)[0x7f7685aeec3d]
> /usr/bin/x11vnc[0x4a0951]
> /usr/bin/x11vnc[0x463d8a]
> /usr/bin/x11vnc[0x410c0a]
> /lib64/libc.so.6(__libc_start_main+0xf5)[0x7f768306eb15]
> /usr/bin/x11vnc[0x41b201]
> ======= Memory map: ========
> .
> .
> .
> caught signal: 6
> 31/05/2016 14:09:24 deleted 60 tile_row polling images.
> 
> 
> This is a similar use case, and exactly the same error as was reported 
> in the ubuntu and debian lists as far back as 2014.
> 
> I'm using CentoOS 7 which is up to date at x11vnc 0.9.13
> 
> I AM SERVING A 1920x1080 DISPLAY!!! for each screen.  The thing that 
> immediately comes to mind is whether the server was compiled to take 
> into account the larger screen buffers.
> 
> Does anyone care to address this "known bug"?
> 
> 
> 
> 
> 
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