[New-bugs-announce] [issue3645] readline module Crashs on OpenBSD/amd64

Henry Precheur report at bugs.python.org
Fri Aug 22 07:41:09 CEST 2008

New submission from Henry Precheur <henry at precheur.org>:

$ python2.5                                                            
Python 2.5.2 (r252:60911, Jun 16 2008, 15:20:47)                       
[GCC 3.3.5 (propolice)] on openbsd4                                    
Type "help", "copyright", "credits" or "license" for more information. 
>>> def complete(text, state):                                         
...     print 'complete %r %d' % (text, state)                         
...     if text == 'i' and state == 0:                                 
...         return 'import'                                            
...     else:                                                          
...         return None                                                
>>> import readline; readline.parse_and_bind("tab: complete")
>>> readline.set_completer(complete)                                   
>>> i<TAB> # <TAB> is press the tab key                                
complete 'i' 0                                                         
complete 'i' 1                                                         
Segmentation fault (core dumped)                                       
The problem is that Python is using a function present in libreadline  
but not declared in readline/readline.h: completion_matches. Instead of
using rl_completion_matches.                                           
Therefor the return type of completion_matches was an int which is     
32bits on amd64 but the function was supposed to returns a pointer which
is 64 bits. So when the pointer had a "high" value, it was truncated.  
The problem is fixed by adding libcurses to AC_CHECK_LIB when checking
for functions in libreadline since libreadline depends on curses. This
makes Python use the correct functions declared on readline.h with a   
correct return type.

Patch is attached.

(Others versions of Python should also be affected)

components: Library (Lib)
files: patch.configure.in
messages: 71723
nosy: henry.precheur
severity: normal
status: open
title: readline module Crashs on OpenBSD/amd64
type: crash
versions: Python 2.5
Added file: http://bugs.python.org/file11206/patch.configure.in

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