Ubuntu
xserver-xorg-input-synaptics package

synaptics driver fails to load (dlopen error)

Bug #54290 reported by Mathieu Bérard
40
Affects Status Importance Assigned to Milestone
xserver-xorg-input-synaptics (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

Relevant part of Xorg.0.log:

(II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so
dlopen: /usr/lib/xorg/modules/input/synaptics_drv.so: undefined symbol: __stack_chk_fail_local
(EE) Failed to load /usr/lib/xorg/modules/input/synaptics_drv.so

This error seems to be somewhat related with gcc's stack smashing protection...

Revision history for this message
Mathieu Bérard (mathieu-berard) wrote :

Workaround:
the driver loads and works correctly if ssp is disabled at build time by
adding '-fno-stack-protector' to CCOPTIONS in the makefile.

Revision history for this message
Adam Israel (aisrael) wrote :

I am also seeing this happen, as of version 0.14-6-0ubuntu1.

Changed in xserver-xorg-input-synaptics:
status: Unconfirmed → Confirmed
Revision history for this message
Mathieu Bérard (mathieu-berard) wrote :

Better-workaround (which keep ssp enabled):
I have no clue about how ssp works but there seems to be a problem related
to the linking stage in the build process.
I have tried to change various ld options with no success...
It seems that gcc knows how to properly invoke ld, so if you pass LD=gcc to the makefile, then gcc is used in the linking stage and calls ld with he good options to deal with ssp.
There is then no trace of this __stack_chk_fail_local symbol in the final binary which loads and work as expected.

Revision history for this message
Rodrigo Novo (rodarvus) wrote :

0.14-6-0ubuntu2 uploaded (with Stack Protection disabled).

Thanks for the report guys!

Changed in xserver-xorg-input-synaptics:
status: Confirmed → Fix Released
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