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Bug #26551 PHP script goes into infinite loop, providing overflow in backtrace
Submitted: 2003-12-07 17:41 UTC Modified: 2003-12-14 21:16 UTC
From: phyre at rogers dot com Assigned:
Status: No Feedback Package: Scripting Engine problem
PHP Version: 4.3.4 OS: Linux
Private report: No CVE-ID: None
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From: phyre at rogers dot com
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 [2003-12-07 17:41 UTC] phyre at rogers dot com
PHP script which worked perfectly with 4.3.2 configured identically now goes into infinite loop at 99.9% CPU.  There is no strace activity.

GDB Backtrace claims overflow error as follows.

Actual result:
(gdb) bt
#0  xbuf_resize (xbuf=0xbffe2850, add=1) at /usr/src/WWW-2003.12.01/php-4.3.4/main/spprintf.c:127
#1  0x0813c9e8 in xbuf_format_converter (xbuf=0xbffe2850, fmt=0x1 <Address 0x1 out of bounds>, 
    ap=0xbffe317c "??\035\b|?.\b\016\020\035\b") at /usr/src/WWW-2003.12.01/php-4.3.4/main/spprintf.c:272
#2  0x0813d3b6 in vspprintf (pbuf=0x1, max_len=3221104720, format=0xbffe2850 "t@1\b\200", ap=0xbffe2850 "t@1\b\200")
    at /usr/src/WWW-2003.12.01/php-4.3.4/main/spprintf.c:638
#3  0x08139ae1 in php_error_cb (type=-1073862576, 
    error_filename=0x82e7f74 "/adm/vhosts/www/code/process_statistics/process_stats.php", 
    error_lineno=137445501, format=0xbffe2850 "t@1\b\200", args=0xbffe2850 "t@1\b\200")
    at /usr/src/WWW-2003.12.01/php-4.3.4/main/main.c:601


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 [2003-12-07 18:14 UTC] phyre at rogers dot com
This is with 4.3.2.  Seems it doesn't work there either.  Find the error messages a bit alarming however.

(gdb) bt
#0  0x08141b20 in _zval_dtor (zvalue=0x8225ae4) at /usr/src/php-4.3.2/Zend/zend_variables.c:37
#1  0x0813b8fb in _zval_ptr_dtor (zval_ptr=0x8225ae4) at /usr/src/php-4.3.2/Zend/zend_execute_API.c:291
#2  0x081467ec in zend_hash_add_or_update (ht=0x81c9c4c, arKey=0x816ea2b "php_errormsg", nKeyLength=13, pData=0xbffe2580, 
    nDataSize=4, pDest=0x0, flag=1) at /usr/src/php-4.3.2/Zend/zend_hash.c:249
#3  0x0811baab in php_error_cb (type=136467492, 
    error_filename=0x821a084 "/adm/vhosts/www/code/process_statistics/process_stats.php", error_lineno=23, 
    format=0x3 <Address 0x3 out of bounds>, args=0x3 <Address 0x3 out of bounds>) at /usr/src/php-4.3.2/main/main.c:726
(gdb) quit

0  0x0811e302 in xbuf_init (xbuf=0xbffe2510, max_len=1024) at /usr/src/php-4.3.2/main/spprintf.c:160
#1  0x0811ecb1 in vspprintf (pbuf=0xbffe2578, max_len=1024, format=0x400 <Address 0x400 out of bounds>, 
    ap=0x400 <Address 0x400 out of bounds>) at /usr/src/php-4.3.2/main/spprintf.c:614
#2  0x0811b7d1 in php_error_cb (type=-1073863408, 
    error_filename=0x821a084 "/adm/vhosts/www/code/process_statistics/process_stats.php", error_lineno=24, 
    format=0x400 <Address 0x400 out of bounds>, args=0x400 <Address 0x400 out of bounds>) at /usr/src/php-4.3.2/main/main.c:604
(gdb) quit
 [2003-12-07 22:38 UTC]
Could you please provide the shortest possible PHP code that can be used to duplicate the problem.
 [2003-12-14 21:16 UTC]
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.

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