Markus Kuhn writes:
> I believe that somewhere between main() is started and tgetent() is
> called, an xterm bug causes a static variable of libtermcap to be
> overwritten. How do I find whether and where this happens, if it happens
> only when I use the Red Hat precompiled shared-library version of
> libtermcap without debugging info? In other words, I don't even have the
> address of is_malloc to watch it.
Here is how I'd do it:
- Become root; you can't debug setuid/setgid executables without being
root.
- Retrieve the patched source from RedHat CDs or their ftp server.
- gdb xterm
(gdb) disassemble tgetent
This should tell you the address of the is_malloced variable.
- Now set a hardware watchpoint on this address.
(gdb) break main
(gdb) run
(gdb) watch *(int*) 0xAddress_of_is_malloced
(gdb) continue
Bruno
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