File php-5.2.17-CVE-2011-4885.patch of Package php-5.2.15

From b912b2e02d02534380e32d642f139cbdc76a0b09 Mon Sep 17 00:00:00 2001
From: "Vojtech Vitek (V-Teq)" <vvitek@redhat.com>
Date: Thu, 5 Jan 2012 11:45:12 +0100
Subject: [PATCH] Add max_input_vars directive to prevent attacks based on
 hash collisions

Based on:
http://svn.php.net/viewvc?view=revision&revision=321038
http://svn.php.net/viewvc?view=revision&revision=321040
http://svn.php.net/viewvc?view=revision&revision=321335
---
 main/main.c          |    1 +
 main/php_globals.h   |    2 ++
 main/php_variables.c |   20 ++++++++++++++++----
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/main/php_variables.c b/main/php_variables.c
index c70544c..5e0b677 100644
--- a/main/php_variables.c
+++ b/main/php_variables.c
@@ -179,9 +179,14 @@ PHPAPI void php_register_variable_ex(char *var, zval *val, zval *track_vars_arra
 				}
 				if (zend_symtable_find(symtable1, escaped_index, index_len + 1, (void **) &gpc_element_p) == FAILURE
 					|| Z_TYPE_PP(gpc_element_p) != IS_ARRAY) {
-					MAKE_STD_ZVAL(gpc_element);
-					array_init(gpc_element);
-					zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p);
+					if (zend_hash_num_elements(symtable1) <= PG(max_input_vars)) {
+						if (zend_hash_num_elements(symtable1) == PG(max_input_vars)) {
+							php_error_docref(NULL TSRMLS_CC, E_WARNING, "Input variables exceeded %ld. To increase the limit change max_input_vars in php.ini.", PG(max_input_vars));
+						}
+						MAKE_STD_ZVAL(gpc_element);
+						array_init(gpc_element);
+						zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p);
+					}
 				}
 				if (index != escaped_index) {
 					efree(escaped_index);
@@ -224,7 +229,14 @@ plain_var:
 				zend_symtable_exists(symtable1, escaped_index, index_len + 1)) {
 				zval_ptr_dtor(&gpc_element);
 			} else {
-				zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p);
+				if (zend_hash_num_elements(symtable1) <= PG(max_input_vars)) {
+					if (zend_hash_num_elements(symtable1) == PG(max_input_vars)) {
+						php_error_docref(NULL TSRMLS_CC, E_WARNING, "Input variables exceeded %ld. To increase the limit change max_input_vars in php.ini.", PG(max_input_vars));
+					}
+					zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p);
+				} else {
+					zval_ptr_dtor(&gpc_element);
+				}
 			}
 			if (escaped_index != index) {
 				efree(escaped_index);
-- 
1.7.6.2

--- php-5.2.17/main/main.c.orig	2010-06-19 22:47:24.000000000 +0200
+++ php-5.2.17/main/main.c	2012-02-08 12:29:58.164985316 +0100
@@ -436,6 +436,7 @@
 	STD_PHP_INI_ENTRY("post_max_size",			"8M",		PHP_INI_SYSTEM|PHP_INI_PERDIR,		OnUpdateLong,			post_max_size,			sapi_globals_struct,sapi_globals)
 	STD_PHP_INI_ENTRY("upload_tmp_dir",			NULL,		PHP_INI_SYSTEM,		OnUpdateStringUnempty,	upload_tmp_dir,			php_core_globals,	core_globals)
 	STD_PHP_INI_ENTRY("max_input_nesting_level", "64",		PHP_INI_SYSTEM|PHP_INI_PERDIR,		OnUpdateLongGEZero,	max_input_nesting_level,			php_core_globals,	core_globals)
+	STD_PHP_INI_ENTRY("max_input_vars",                     "1000",         PHP_INI_SYSTEM|PHP_INI_PERDIR,          OnUpdateLong,   max_input_vars,                                         php_core_globals,       core_globals)
 
 	STD_PHP_INI_ENTRY("user_dir",				NULL,		PHP_INI_SYSTEM,		OnUpdateString,			user_dir,				php_core_globals,	core_globals)
 	STD_PHP_INI_ENTRY("variables_order",		"EGPCS",	PHP_INI_SYSTEM|PHP_INI_PERDIR,		OnUpdateStringUnempty,	variables_order,		php_core_globals,	core_globals)
--- php-5.2.17/main/php_globals.h.orig	2010-01-03 10:23:27.000000000 +0100
+++ php-5.2.17/main/php_globals.h	2012-02-08 12:30:59.184987601 +0100
@@ -160,6 +160,7 @@
 	zend_bool com_initialized;
 #endif
 	long max_input_nesting_level;
+	long max_input_vars;
 	zend_bool in_user_include;
 	zend_bool in_error_log;
 };