Public bug reported:
When xcache is loaded a s a PHP extension:
extension=xcache.so
Any attempt to execute an ionCube-encoded file crashes PHP w/backtrace
like this:
#0 zm_shutdown_xcache (type=<value optimized out>, module_number=53) at
/build/buildd/php5-xcache-1.3.1/xcache.c:2968
#1 0x000000000069c2df in module_destructor (module=0xf0d3a0) at
/build/buildd/php5-5.3.3/Zend/zend_API.c:2098
#2 0x00000000006a30e1 in zend_hash_apply_deleter (ht=0xdc0760, p=0xf0d340) at
/build/buildd/php5-5.3.3/Zend/zend_hash.c:813
#3 0x00000000006a3368 in zend_hash_graceful_reverse_destroy (ht=0xdc0760) at
/build/buildd/php5-5.3.3/Zend/zend_hash.c:848
#4 0x0000000000697045 in zend_shutdown () at
/build/buildd/php5-5.3.3/Zend/zend.c:831
#5 0x00000000006427ed in php_module_shutdown () at
/build/buildd/php5-5.3.3/main/main.c:2166
#6 0x000000000072625f in main (argc=-1969359736, argv=0x0) at
/build/buildd/php5-5.3.3/sapi/cli/php_cli.c:1391
This happens because xCache does not validate the result of
zend_extension *ext = zend_get_extension(XCACHE_NAME);
called in zm_shutdown_xcache (PHP_MSHUTDOWN_FUNCTION(xcache))
I don't know what ionCube Loader does but
zend_get_extension(XCACHE_NAME) returns NULL in this case.
When xcache tries to dereference a NULL pointer in
if (ext->shutdown) {
we get a crash.
---
Ubuntu: 10.10 AMD64
xCache: 1.3.0, 1.3.1
** Affects: xcache (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/688041
Title:
xcache crashes during module shutdown when used together with ionCube Loader
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