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From 6517ac845b4ed91cd8762d3aa22de5f3c9b0e067 Mon Sep 17 00:00:00 2001 |
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From: "Vojtech Vitek (V-Teq)" <vvitek@redhat.com> |
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Date: Tue, 3 Jan 2012 02:04:09 +0100 |
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Subject: [PATCH] Add max_input_vars directive to prevent attacks based on |
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hash collisions |
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Based on: |
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http://svn.php.net/viewvc?view=revision&revision=321038 |
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http://svn.php.net/viewvc?view=revision&revision=321040 |
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http://svn.php.net/viewvc?view=revision&revision=321335 |
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--- |
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main/main.c | 1 + |
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main/php_globals.h | 2 ++ |
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main/php_variables.c | 20 ++++++++++++++++---- |
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php.ini-development | 3 +++ |
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php.ini-production | 3 +++ |
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5 files changed, 25 insertions(+), 4 deletions(-) |
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diff --git a/main/main.c b/main/main.c |
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index 45751ad..708e772 100644 |
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--- a/main/main.c |
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+++ b/main/main.c |
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@@ -496,6 +496,7 @@ PHP_INI_BEGIN() |
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STD_PHP_INI_ENTRY("post_max_size", "8M", PHP_INI_SYSTEM|PHP_INI_PERDIR, OnUpdateLong, post_max_size, sapi_globals_struct,sapi_globals) |
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STD_PHP_INI_ENTRY("upload_tmp_dir", NULL, PHP_INI_SYSTEM, OnUpdateStringUnempty, upload_tmp_dir, php_core_globals, core_globals) |
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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) |
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+ STD_PHP_INI_ENTRY("max_input_vars", "1000", PHP_INI_SYSTEM|PHP_INI_PERDIR, OnUpdateLongGEZero, max_input_vars, php_core_globals, core_globals) |
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STD_PHP_INI_ENTRY("user_dir", NULL, PHP_INI_SYSTEM, OnUpdateString, user_dir, php_core_globals, core_globals) |
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STD_PHP_INI_ENTRY("variables_order", "EGPCS", PHP_INI_SYSTEM|PHP_INI_PERDIR, OnUpdateStringUnempty, variables_order, php_core_globals, core_globals) |
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diff --git a/main/php_globals.h b/main/php_globals.h |
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index dda28f2..5d898fa 100644 |
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--- a/main/php_globals.h |
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+++ b/main/php_globals.h |
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@@ -170,6 +170,8 @@ struct _php_core_globals { |
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char *mail_log; |
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zend_bool in_error_log; |
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+ |
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+ long max_input_vars; |
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}; |
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diff --git a/main/php_variables.c b/main/php_variables.c |
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index de80b09..9b05793 100644 |
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--- a/main/php_variables.c |
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+++ b/main/php_variables.c |
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@@ -191,9 +191,14 @@ PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars |
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} |
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if (zend_symtable_find(symtable1, escaped_index, index_len + 1, (void **) &gpc_element_p) == FAILURE |
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|| Z_TYPE_PP(gpc_element_p) != IS_ARRAY) { |
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- MAKE_STD_ZVAL(gpc_element); |
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- array_init(gpc_element); |
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- zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p); |
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+ if (zend_hash_num_elements(symtable1) <= PG(max_input_vars)) { |
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+ if (zend_hash_num_elements(symtable1) == PG(max_input_vars)) { |
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+ 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)); |
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+ } |
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+ MAKE_STD_ZVAL(gpc_element); |
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+ array_init(gpc_element); |
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+ zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p); |
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+ } |
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} |
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if (index != escaped_index) { |
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efree(escaped_index); |
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@@ -236,7 +241,14 @@ plain_var: |
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zend_symtable_exists(symtable1, escaped_index, index_len + 1)) { |
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zval_ptr_dtor(&gpc_element); |
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} else { |
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- zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p); |
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+ if (zend_hash_num_elements(symtable1) <= PG(max_input_vars)) { |
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+ if (zend_hash_num_elements(symtable1) == PG(max_input_vars)) { |
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+ 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)); |
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+ } |
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+ zend_symtable_update(symtable1, escaped_index, index_len + 1, &gpc_element, sizeof(zval *), (void **) &gpc_element_p); |
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+ } else { |
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+ zval_ptr_dtor(&gpc_element); |
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+ } |
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} |
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if (escaped_index != index) { |
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efree(escaped_index); |
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diff --git a/php.ini-development b/php.ini-development |
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index 60d1000..12a8783 100644 |
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--- a/php.ini-development |
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+++ b/php.ini-development |
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@@ -453,6 +453,9 @@ max_input_time = 60 |
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; http://php.net/max-input-nesting-level |
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;max_input_nesting_level = 64 |
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+; How many GET/POST/COOKIE input variables may be accepted |
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+; max_input_vars = 1000 |
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+ |
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; Maximum amount of memory a script may consume (128MB) |
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; http://php.net/memory-limit |
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memory_limit = 128M |
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diff --git a/php.ini-production b/php.ini-production |
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index 5ace330..487f823 100644 |
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--- a/php.ini-production |
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+++ b/php.ini-production |
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@@ -453,6 +453,9 @@ max_input_time = 60 |
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; http://php.net/max-input-nesting-level |
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;max_input_nesting_level = 64 |
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+; How many GET/POST/COOKIE input variables may be accepted |
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+; max_input_vars = 1000 |
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+ |
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; Maximum amount of memory a script may consume (128MB) |
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; http://php.net/memory-limit |
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memory_limit = 128M |
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-- |
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1.7.6.2 |
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