#50399 [NEW]: segfault when using SAPI
From: ikickdogsforfun at hotmail dot com
Operating system: Debian 5
PHP version: 5.3.1
PHP Bug Type: Scripting Engine problem
Bug description: segfault when using SAPI
Description:
------------
When using PHP SAPI and values have been added to the global $_SERVER
variable, shutdown segfaults in zend_gc. If I remove the setting of the
global variables it doesn't seg fault.
This is possibly not a fault the SAPI, but I've been unable to resolve,
removing the destroy and free commands in shutdown function doesn't stop it
from segfaulting.
Reproduce code:
---------------
The entire source code file is available at
https://crispycrisp.org/php.txt this is the function
that causes a segfault
in shutdown if it has been called:
void php_set_superglobal_server(char *name, char *val)
{
zend_first_try {
HashTable* locals = &EG(symbol_table);
zval *type;
/* Fetch $_SERVER from the global scope */
zend_hash_find(locals, "_SERVER", sizeof("_SERVER"),
(void**)&SERVER);
ALLOC_INIT_ZVAL(type);
ZVAL_STRING(type, val, 1);
ZEND_SET_SYMBOL(Z_ARRVAL_PP(SERVER), name, type);
} zend_end_try();
}
Expected result:
----------------
No segfault
Actual result:
--------------
==17605== Thread 2:
==17605== Invalid read of size 4
==17605== at 0x43B4BB9: gc_remove_zval_from_buffer (zend_gc.h:189)
==17605== by 0x438E18F: _zval_ptr_dtor (zend_execute_API.c:434)
==17605== by 0x43A4C7D: zend_hash_destroy (zend_hash.c:526)
==17605== by 0x804A88A: php_shutdown (php.c:143)
==17605== by 0x804A955: php (php.c:168)
==17605== by 0x8049D94: parsing_request (handler.c:180)
==17605== by 0x80496FE: handle (handler.c:25)
==17605== by 0x4032F3A: start_thread (in /lib/libpthread-2.7.so)
==17605== by 0x4793BED: clone (in /lib/libc-2.7.so)
==17605== Address 0x1c is not stack'd, malloc'd or (recently) free'd
==17605==
==17605== Process terminating with default action of signal 11 (SIGSEGV)
==17605== Access not within mapped region at address 0x1C
==17605== at 0x43B4BB9: gc_remove_zval_from_buffer (zend_gc.h:189)
==17605== by 0x438E18F: _zval_ptr_dtor (zend_execute_API.c:434)
==17605== by 0x43A4C7D: zend_hash_destroy (zend_hash.c:526)
==17605== by 0x804A88A: php_shutdown (php.c:143)
==17605== by 0x804A955: php (php.c:168)
==17605== by 0x8049D94: parsing_request (handler.c:180)
==17605== by 0x80496FE: handle (handler.c:25)
==17605== by 0x4032F3A: start_thread (in /lib/libpthread-2.7.so)
==17605== by 0x4793BED: clone (in /lib/libc-2.7.so)
--
Edit bug report at http://bugs.php.net/?id=50399&edit=1
--
Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=50399&r=trysnapshot52
Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=50399&r=trysnapshot53
Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=50399&r=trysnapshot60
Fixed in SVN: http://bugs.php.net/fix.php?id=50399&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=50399&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=50399&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=50399&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=50399&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=50399&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=50399&r=support
Expected behavior: http://bugs.php.net/fix.php?id=50399&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=50399&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=50399&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=50399&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=50399&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=50399&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=50399&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=50399&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=50399&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=50399&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=50399&r=mysqlcfg
Thread (8 messages)
- ikickdogsforfun at hotmail dot com