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Bug #9461 imap_open crash when connecting to nntp with username and password
Submitted: 2001-02-26 08:36 UTC Modified: 2001-05-27 15:35 UTC
From: bo at erichsen dot com Assigned:
Status: Closed Package: IMAP related
PHP Version: 4.0 Latest CVS (26/02/2001) OS: linux
Private report: No CVE-ID: None
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From: bo at erichsen dot com
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 [2001-02-26 08:36 UTC] bo at erichsen dot com 
function that causes crash
<?php>
imap_open('{newsserver/nntp}'.'test.test','username','password') || die("can't connect: ".imap_last_error());
</php>


backtrace from gdb ( i know it says nothing but i did as described in the backtrace faq.)
#0  0x0 in ?? ()

I have a problem with imap_open:
I can do imap_open on nntp server that has no authentication. But when i try on
a nntpserver that requires a password.. php dumps core (signal 11 gdb backtrace
is #0 0x0 in ?? ()) ( i executed the cgi version of php to be sure that apache
has nothing to do with it.)
i tested c-client with the mtest program and it worked perfectly.
I've tried to compile php4 with -enable-debug but i'm not so experienced with
gdb so when i load the core-file i still get no symbols or references to the
instruction that causes the problem.
it should be simple to test:


try to connect to a nntp server without username and password
try to connect to a nntp server that requires username and password


i have looked through the c-client code and the php4 extension and i could
imagine the problem might be in mm_login but i'm not certain.


the server is running:
php4.0.5-dev latest cvs
linux 2.2.12-20smp
imap (imap-2001.BETA.SNAP-0102201858) also tried (imap-4.7c)
All help is appreciated and if anybody wants more information or maybe a test
nntp account i can provide that (just send me a mail bo@erichsen.com).

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 [2001-05-02 16:49 UTC] chagenbu@php.net 
From:  James Treleaven <jametrel@enoreo.on.ca> 

Like the author of bug #9461, I also tracked the problem down to mm_login() in ext/imap/php_imap.c [that is where my stack was getting stomped].  I replaced the later two calls to strncpy() in the function, with calls to strcpy(), and now I can use the function to login to news servers with no 
problem! 

The code in mm_login() looks correct to me - but I cannot believe that there is a bug in Linux's libc.a:strncpy(). I have a web based gateway up and running with hundreds of user's using my modified imap_open() to successfully connect to nntp with their usernames and passwords (we always require authentication).  My modification seems to be a good workaround - but I don't know why.
 [2001-05-03 15:32 UTC] chagenbu@php.net 
Can you try 4.0.6-cvs and see if Andi's strlcopy change had any affect on this?
 [2001-05-27 15:35 UTC] sniper@php.net 
Should be fixed in CVS and soon to be released 4.0.6.

Try PHP 4.0.6RC1: 

http://www.php.net/~andi/php-4.0.6RC1.tar.gz

--Jani
 
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