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Bug #49823 Segmentation fault after infinite recursion loop, affects <= 5.2.11
Submitted: 2009-10-09 14:27 UTC Modified: 2009-10-09 14:31 UTC
From: radek dot karpowicz at gmail dot com Assigned:
Status: Not a bug Package: Reproducible crash
PHP Version: 5.2.11 OS: Gentoo/Linux
Private report: No CVE-ID: None
View Developer Edit
 [2009-10-09 14:27 UTC] radek dot karpowicz at gmail dot com 
Description:
------------
After running php into infinite recursion loop by defining function and executing it, binary will output segmentation fault.

Same bug here: #15522

http://bugs.php.net/bug.php?id=15522

Why it's not patched since 4.1.1?

Reproduce code:
---------------
<?php
function foo() {

  foo();
}

foo();
?>

Expected result:
----------------
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 261900 bytes) in /bug.php on line 4

Actual result:
--------------
Segmentation fault

GDB Trace:

Starting program: /php-5.2.11/sapi/cli/php -f /bug.php
[Thread debugging using libthread_db enabled]
[New Thread 0xb7be16c0 (LWP 832)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7be16c0 (LWP 832)]
0x082d8a25 in zend_mm_check_ptr (heap=0x845f1d8, ptr=0x852040c, silent=1, __zend_filename=0x8432a34 "/php-5.2.11/Zend/zend_vm_execute.h", __zend_lineno=766, __zend_orig_filename=0x0, __zend_orig_lineno=0)
    at /home/radekk/tmp/php-5.2.11/Zend/zend_alloc.c:1439
1439			if (memcmp(end_magic, &_mem_block_end_magic, END_MAGIC_SIZE)==0) {

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AllCommentsChangesGit/SVN commitsRelated reports
 [2009-10-09 14:28 UTC] pajoye@php.net 
See the other bug reports about that to get an explanation > bogus.
 [2009-10-09 14:31 UTC] radek dot karpowicz at gmail dot com 
There should be something like max_depth_level for functions... In php 5.3 it works fine.
 
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