VNC patch for Xserver 1.3
Stefan Dirsch
sndirsch at suse.de
Wed Oct 17 04:08:06 PDT 2007
On Thu, Aug 23, 2007 at 04:31:02PM +0200, Stefan Dirsch wrote:
> Thanks. Unfortunately the Xserver crashes immediately now.
>
> (gdb) run
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x2ab337bb4290 (LWP 4737)]
> 0x00000000004a0bdc in xf86CollectInputOptions ()
> (gdb) bt
> #0 0x00000000004a0bdc in xf86CollectInputOptions ()
> #1 0x00002ab338d5a019 in xf86rfbKeybInit ()
> from /usr/lib64/xorg/modules//extensions/libvnc.so
> #2 0x0000000000467fdc in InitInput ()
> #3 0x0000000000439931 in main ()
> (gdb) quit
Tried again with X.Org 7.3 and current xf4vnc CVS. Still crashing. :-)
Here are the results of my investigations.
Backtrace:
0: X(xf86SigHandler+0x6a) [0x48ce3a]
1: /lib64/libc.so.6 [0x2b2b2e271ba0]
2: /lib64/libc.so.6(strlen+0x40) [0x2b2b2e2b6ba0]
3: X(xf86ActivateDevice+0x59) [0x47b389]
4: X(InitInput+0x4d) [0x46785d]
5: X(main+0x370) [0x436210]
6: /lib64/libc.so.6(__libc_start_main+0xf4) [0x2b2b2e25eb24]
7: X(FontFileCompleteXLFD+0x259) [0x435659]
Program received signal SIGSEGV, Segmentation fault.
0x00002b587f48eba0 in strlen () from /lib64/libc.so.6
(gdb) bt
#0 0x00002b587f48eba0 in strlen () from /lib64/libc.so.6
#1 0x000000000047b389 in xf86ActivateDevice (local=0x8be9d0)
at xf86Xinput.c:158
#2 0x000000000046785d in InitInput (argc=<value optimized out>,
argv=<value optimized out>) at xf86Init.c:960
#3 0x0000000000436210 in main (argc=1, argv=0x7fff2ce5c1a8, envp=0x83a090)
at main.c:397
158 local->atom = MakeAtom(local->type_name,
159 strlen(local->type_name),
160 TRUE);
(gdb) p* local
$3 = {next = 0x8be900, name = 0x7ef4d0 "Mouse[3]", flags = 78,
device_control = 0x2b0c70993820 <xf86rfbMouseControlProc>, read_input = 0,
control_proc = 0, close_proc = 0, switch_mode = 0, conversion_proc = 0,
reverse_conversion_proc = 0, set_device_valuators = 0, fd = -1, atom = 0,
dev = 0x0, private = 0x0, private_flags = 0, first = 0, last = 0, old_x = 0,
old_y = 0, type_name = 0x0, always_core_feedback = 0x2b0c709acb3c,
conf_idev = 0x0, drv = 0x7f5000, module = 0x0, options = 0x0,
history_size = 256}
Looks like the pInfo structure gets not filled properly. I'm not sure,
where this is done. Here is the configuration I'm currently using.
Section "InputDevice"
Driver "rfbkeyb"
Identifier "Keyboard[2]"
Option "InputFashion" "VNC"
EndSection
Section "InputDevice"
Driver "rfbmouse"
Identifier "Mouse[3]"
Option "InputFashion" "VNC"
EndSection
Section "ServerLayout"
[...]
InputDevice "Keyboard[2]" "ExtraKeyboard"
InputDevice "Mouse[3]" "ExtraPointer"
EndSection
You get different results for pInfo for a regular mouse section and of
course no crashes.
Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "Buttons" "5"
Option "Device" "/dev/input/mice"
Option "Name" "MX310"
Option "Protocol" "ExplorerPS/2"
Option "Vendor" "Logitech"
Option "ZAxisMapping" "4 5"
EndSection
(gdb) p* local
$2 = {next = 0x8b9230, name = 0x7ee9d0 "Mouse[1]", flags = 78,
device_control = 0x2b61f0cebea0 <MouseProc>,
read_input = 0x2b61f0ceb1a0 <MouseReadInput>, control_proc = 0,
close_proc = 0, switch_mode = 0,
conversion_proc = 0x2b61f0ce86a0 <MouseConvert>,
reverse_conversion_proc = 0, set_device_valuators = 0, fd = -1, atom = 0,
dev = 0x0, private = 0x8be180, private_flags = 0, first = 0, last = 0,
old_x = 0, old_y = 0, type_name = 0x2b61f0cedd55 "MOUSE",
always_core_feedback = 0x0, conf_idev = 0x7f4e90, drv = 0x808070,
module = 0x8be0a0, options = 0x8bda80, history_size = 256}
Alan, can you at least reproduce this problem?
Best regards,
Stefan
Public Key available
------------------------------------------------------
Stefan Dirsch (Res. & Dev.) SUSE LINUX Products GmbH
Tel: 0911-740 53 0 Maxfeldstraße 5
FAX: 0911-740 53 479 D-90409 Nürnberg
http://www.suse.de Germany
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