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Re: [XForms] Problem with fdesign (fdesigns menu bar) (fwd)

From: Clive Stubbings
Subject: Re: [XForms] Problem with fdesign (fdesigns menu bar) (fwd)
Date: Wed, 30 Jun 2021 02:27:35 +0100 (BST)


There has been a regression in the xorg libX11

It is likely this is your issue - it was spotted in one of my xforms programs a 
few weeks ago by one of my users.

XStoreName used to tolerate a NULL pointer (it checked before using it). New 
code has been added ahead of that check.

If your system has recently updated its libraries, thats likely the cause.

I believe it has now been fixed upstream thanks to the person who spotted the 
problem feeding the cause back to the developers and a new version should come 
through in due course.

If you need a quicker fix, hack the library to make sure it doesn't pass a NULL 
pointer to XStoreName.


On Sun, 27 Jun 2021, ternaryd wrote:

On Sat, 26 Jun 2021 15:47:12 -0700
Coby Hochstein <cjh39@cox.net> wrote:


when I load fdesign and click on the "File"
menu bar fdesign segmentation faults.
I'm running xforms-1.2.4

(gdb) run
Starting program: /usr/local/bin/fdesign
[Thread debugging using libthread_db enabled]
Using host libthread_db library

Program received signal SIGSEGV, Segmentation
strlen () at ../sysdeps/arm/armv6/strlen.S:26
26 ../sysdeps/arm/armv6/strlen.S: No such
file or directory.

Any idea ?

fdesign is calculating the string length of a
string pointing to NULL.

Use a version of fdesign compiled with debugging
enabled, run it again until crash, and check the
coredump in gdb. Use the "up" command until you
reach a stack level belonging to fdesign (or
xforms). You should see which pointer is NULL.
Then you can try to figure out, why it is NULL
and how to fix it.

   $ ulimit -c unlimited
   $ ./fdesign ...
   $ gdb ./fdesign coredump
   (gdb> up

you can query the value of any variable at the
time of the crash with

   (gdb) p varname



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