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Bug #20108 $a = "boo"; printf("%580.58s\n", $a); Segfaults
Submitted: 2002-10-26 13:13 UTC Modified: 2002-10-26 15:45 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: jeroen at unfix dot org Assigned: iliaa (profile)
Status: Closed Package: Reproducible crash
PHP Version: 4.0CVS-2002-10-20 OS: Linux and NetBSD
Private report: No CVE-ID: None
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 [2002-10-26 13:13 UTC] jeroen at unfix dot org 
The oops:
8<-------------
jeroen@noc:~$ ulimit -c unlimited
jeroen@noc:~$ php4
<?php $a = "boo"; printf("%580.58s\n", $a); ?>
Segmentation fault (core dumped)
------------->8

The system:
8<-------------
jeroen@noc:~$ uname -a
Linux noc 2.4.18 #1 Wed May 29 22:19:46 CEST 2002 i686 Intel(R) Celeron(TM) CPU
               1200MHz GenuineIntel GNU/Linux
------------->8
It's Debian unstable, current as of 26-Oct-2002

Relevant Debian packages:
ii  libc6          2.3.1-3
ii  php4-cgi       4.2.3-3

Backtrace:
8<--------------
(gdb) bt
#0  0x402711af in mallopt () from /lib/libc.so.6
#1  0x4027001f in realloc () from /lib/libc.so.6
#2  0x080dd7a3 in _erealloc ()
#3  0x080a6b6a in php_if_stat ()
#4  0x080a8804 in zif_user_printf ()
#5  0x0810c060 in execute ()
#6  0x080ea428 in zend_execute_scripts ()
#7  0x080664cd in php_execute_script ()
#8  0x08064363 in main ()
#9  0x4021b9d3 in __libc_start_main () from /lib/libc.so.6
(gdb) q
-------------->8

I've also tested it on NetBSD, which also segfaulted apache and gave back a whole lot of wrong things (buffer from previous sessions).

OpenBSD 3.1 + FreeBSD 4.6-RELEASE didn't have this problem
so this could quite well be glibc related, see the traceback above.

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 [2002-10-26 15:13 UTC] msopacua@php.net 
Somewhat reproduced with BSDi 4.2. Not a segfault, but garbage output.

added testcase to CVS.
Updated version.
 [2002-10-26 15:25 UTC] jeroen at unfix dot org 
I just re-tested this on a FreeBSD 4.6-RELEASE again and:

------------------------->8
jeroen@hog:~$ uname -a
<?php $a = "boo"; printf("%580.58s\n", $a); ?>
X-Powered-By: PHP/4.1.1
Content-type: text/html

                                                                                                                                                                                                                                                
------------------------->8
Notice the many \n's, this could be an empty buffer...
Which is the same I got on OpenBSD 3.1...
 [2002-10-26 15:45 UTC] iliaa@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

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