Commit message: Fix bug #73807
CVE: CVE-2017-11142
CWE: CWE-400
Vulnerability description: In PHP before 5.6.31, 7.x before 7.0.17, and 7.1.x before 7.1.3, remote attackers could cause a CPU consumption denial of service attack by injecting long form variables, related to main/php_variables.c.

Project: php-src
File: php_variables.c

SAPI_API SAPI_POST_HANDLER_FUNC(php_std_post_handler)
{
	zval *arr = (zval *) arg;
	php_stream *s = SG(request_info).request_body;
	post_var_data_t post_data;

	if (s && SUCCESS == php_stream_rewind(s)) {
		memset(&post_data, 0, sizeof(post_data));

		while (!php_stream_eof(s)) {
			char buf[SAPI_POST_HANDLER_BUFSIZ] = {0};
			size_t len = php_stream_read(s, buf, SAPI_POST_HANDLER_BUFSIZ);

			if (len && len != (size_t) -1) {
				smart_str_appendl(&post_data.str, buf, len);

				if (SUCCESS != add_post_vars(arr, &post_data, 0)) {
					smart_str_free(&post_data.str);
					return;
				}
			}

			if (len != SAPI_POST_HANDLER_BUFSIZ){
				break;
			}
		}

		if (post_data.str.s) {
			add_post_vars(arr, &post_data, 1);
			smart_str_free(&post_data.str);
		}
	}
}

Project: php-src
File: php_variables.c

SAPI_API SAPI_TREAT_DATA_FUNC(php_default_treat_data)
{
	char *res = NULL, *var, *val, *separator = NULL;
	const char *c_var;
	zval array;
	int free_buffer = 0;
	char *strtok_buf = NULL;
	zend_long count = 0;

	ZVAL_UNDEF(&array);
	switch (arg) {
		case PARSE_POST:
		case PARSE_GET:
		case PARSE_COOKIE:
			array_init(&array);
			switch (arg) {
				case PARSE_POST:
					zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_POST]);
					ZVAL_COPY_VALUE(&PG(http_globals)[TRACK_VARS_POST], &array);
					break;
				case PARSE_GET:
					zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_GET]);
					ZVAL_COPY_VALUE(&PG(http_globals)[TRACK_VARS_GET], &array);
					break;
				case PARSE_COOKIE:
					zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_COOKIE]);
					ZVAL_COPY_VALUE(&PG(http_globals)[TRACK_VARS_COOKIE], &array);
					break;
			}
			break;
		default:
			ZVAL_COPY_VALUE(&array, destArray);
			break;
	}

	if (arg == PARSE_POST) {
		sapi_handle_post(&array);
		return;
	}

	if (arg == PARSE_GET) {		/* GET data */
		c_var = SG(request_info).query_string;
		if (c_var && *c_var) {
			res = (char *) estrdup(c_var);
			free_buffer = 1;
		} else {
			free_buffer = 0;
		}
	} else if (arg == PARSE_COOKIE) {		/* Cookie data */
		c_var = SG(request_info).cookie_data;
		if (c_var && *c_var) {
			res = (char *) estrdup(c_var);
			free_buffer = 1;
		} else {
			free_buffer = 0;
		}
	} else if (arg == PARSE_STRING) {		/* String data */
		res = str;
		free_buffer = 1;
	}

	if (!res) {
		return;
	}

	switch (arg) {
		case PARSE_GET:
		case PARSE_STRING:
			separator = (char *) estrdup(PG(arg_separator).input);
			break;
		case PARSE_COOKIE:
			separator = ";\0";
			break;
	}

	var = php_strtok_r(res, separator, &strtok_buf);

	while (var) {
		val = strchr(var, '=');

		if (arg == PARSE_COOKIE) {
			/* Remove leading spaces from cookie names, needed for multi-cookie header where ; can be followed by a space */
			while (isspace(*var)) {
				var++;
			}
			if (var == val || *var == '\0') {
				goto next_cookie;
			}
		}

		if (++count > PG(max_input_vars)) {
			php_error_docref(NULL, E_WARNING, "Input variables exceeded " ZEND_LONG_FMT ". To increase the limit change max_input_vars in php.ini.", PG(max_input_vars));
			break;
		}

		if (val) { /* have a value */
			size_t val_len;
			size_t new_val_len;

			*val++ = '\0';
			php_url_decode(var, strlen(var));
			val_len = php_url_decode(val, strlen(val));
			val = estrndup(val, val_len);
			if (sapi_module.input_filter(arg, var, &val, val_len, &new_val_len)) {
				php_register_variable_safe(var, val, new_val_len, &array);
			}
			efree(val);
		} else {
			size_t val_len;
			size_t new_val_len;

			php_url_decode(var, strlen(var));
			val_len = 0;
			val = estrndup("", val_len);
			if (sapi_module.input_filter(arg, var, &val, val_len, &new_val_len)) {
				php_register_variable_safe(var, val, new_val_len, &array);
			}
			efree(val);
		}
next_cookie:
		var = php_strtok_r(NULL, separator, &strtok_buf);
	}

	if (arg != PARSE_COOKIE) {
		efree(separator);
	}

	if (free_buffer) {
		efree(res);
	}
}

Project: php-src
File: php_variables.c

void _php_import_environment_variables(zval *array_ptr)
{
	char buf[128];
	char **env, *p, *t = buf;
	size_t alloc_size = sizeof(buf);
	unsigned long nlen; /* ptrdiff_t is not portable */

	for (env = environ; env != NULL && *env != NULL; env++) {
		p = strchr(*env, '=');
		if (!p) {				/* malformed entry? */
			continue;
		}
		nlen = p - *env;
		if (nlen >= alloc_size) {
			alloc_size = nlen + 64;
			t = (t == buf ? emalloc(alloc_size): erealloc(t, alloc_size));
		}
		memcpy(t, *env, nlen);
		t[nlen] = '\0';
		php_register_variable(t, p + 1, array_ptr);
	}
	if (t != buf && t != NULL) {
		efree(t);
	}
}

Project: php-src
File: php_variables.c

static inline int add_post_vars(zval *arr, post_var_data_t *vars, zend_bool eof)
{
	uint64_t max_vars = PG(max_input_vars);

	vars->ptr = ZSTR_VAL(vars->str.s);
	vars->end = ZSTR_VAL(vars->str.s) + ZSTR_LEN(vars->str.s);
	while (add_post_var(arr, vars, eof)) {
		if (++vars->cnt > max_vars) {
			php_error_docref(NULL, E_WARNING,
					"Input variables exceeded %" PRIu64 ". "
					"To increase the limit change max_input_vars in php.ini.",
					max_vars);
			return FAILURE;
		}
	}

	if (!eof) {
		memmove(ZSTR_VAL(vars->str.s), vars->ptr, ZSTR_LEN(vars->str.s) = vars->end - vars->ptr);
	}
	return SUCCESS;
}

Project: php-src
File: php_variables.c

static void check_http_proxy(HashTable *var_table)
{
	if (zend_hash_str_exists(var_table, "HTTP_PROXY", sizeof("HTTP_PROXY")-1)) {
		char *local_proxy = getenv("HTTP_PROXY");

		if (!local_proxy) {
			zend_hash_str_del(var_table, "HTTP_PROXY", sizeof("HTTP_PROXY")-1);
		} else {
			zval local_zval;
			ZVAL_STRING(&local_zval, local_proxy);
			zend_hash_str_update(var_table, "HTTP_PROXY", sizeof("HTTP_PROXY")-1, &local_zval);
		}
	}
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_cookie(zend_string *name)
{
	if (PG(variables_order) && (strchr(PG(variables_order),'C') || strchr(PG(variables_order),'c'))) {
		sapi_module.treat_data(PARSE_COOKIE, NULL, NULL);
	} else {
		zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_COOKIE]);
		array_init(&PG(http_globals)[TRACK_VARS_COOKIE]);
	}

	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_COOKIE]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_COOKIE]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_env(zend_string *name)
{
	zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_ENV]);
	array_init(&PG(http_globals)[TRACK_VARS_ENV]);

	if (PG(variables_order) && (strchr(PG(variables_order),'E') || strchr(PG(variables_order),'e'))) {
		php_import_environment_variables(&PG(http_globals)[TRACK_VARS_ENV]);
	}

	check_http_proxy(Z_ARRVAL(PG(http_globals)[TRACK_VARS_ENV]));
	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_ENV]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_ENV]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_files(zend_string *name)
{
	if (Z_TYPE(PG(http_globals)[TRACK_VARS_FILES]) == IS_UNDEF) {
		array_init(&PG(http_globals)[TRACK_VARS_FILES]);
	}

	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_FILES]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_FILES]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_get(zend_string *name)
{
	if (PG(variables_order) && (strchr(PG(variables_order),'G') || strchr(PG(variables_order),'g'))) {
		sapi_module.treat_data(PARSE_GET, NULL, NULL);
	} else {
		zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_GET]);
		array_init(&PG(http_globals)[TRACK_VARS_GET]);
	}

	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_GET]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_GET]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_post(zend_string *name)
{
	if (PG(variables_order) &&
			(strchr(PG(variables_order),'P') || strchr(PG(variables_order),'p')) &&
		!SG(headers_sent) &&
		SG(request_info).request_method &&
		!strcasecmp(SG(request_info).request_method, "POST")) {
		sapi_module.treat_data(PARSE_POST, NULL, NULL);
	} else {
		zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_POST]);
		array_init(&PG(http_globals)[TRACK_VARS_POST]);
	}

	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_POST]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_POST]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static zend_bool php_auto_globals_create_server(zend_string *name)
{
	if (PG(variables_order) && (strchr(PG(variables_order),'S') || strchr(PG(variables_order),'s'))) {
		php_register_server_variables();

		if (PG(register_argc_argv)) {
			if (SG(request_info).argc) {
				zval *argc, *argv;

				if ((argc = zend_hash_str_find_ind(&EG(symbol_table), "argc", sizeof("argc")-1)) != NULL &&
					(argv = zend_hash_str_find_ind(&EG(symbol_table), "argv", sizeof("argv")-1)) != NULL) {
					Z_ADDREF_P(argv);
					zend_hash_str_update(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]), "argv", sizeof("argv")-1, argv);
					zend_hash_str_update(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]), "argc", sizeof("argc")-1, argc);
				}
			} else {
				php_build_argv(SG(request_info).query_string, &PG(http_globals)[TRACK_VARS_SERVER]);
			}
		}

	} else {
		zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_SERVER]);
		array_init(&PG(http_globals)[TRACK_VARS_SERVER]);
	}

	check_http_proxy(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]));
	zend_hash_update(&EG(symbol_table), name, &PG(http_globals)[TRACK_VARS_SERVER]);
	Z_ADDREF(PG(http_globals)[TRACK_VARS_SERVER]);

	return 0; /* don't rearm */
}

Project: php-src
File: php_variables.c

static void php_autoglobal_merge(HashTable *dest, HashTable *src)
{
	zval *src_entry, *dest_entry;
	zend_string *string_key;
	zend_ulong num_key;
	int globals_check = (dest == (&EG(symbol_table)));

	ZEND_HASH_FOREACH_KEY_VAL(src, num_key, string_key, src_entry) {
		if (Z_TYPE_P(src_entry) != IS_ARRAY
			|| (string_key && (dest_entry = zend_hash_find(dest, string_key)) == NULL)
			|| (string_key == NULL && (dest_entry = zend_hash_index_find(dest, num_key)) == NULL)
			|| Z_TYPE_P(dest_entry) != IS_ARRAY) {
			if (Z_REFCOUNTED_P(src_entry)) {
				Z_ADDREF_P(src_entry);
			}
			if (string_key) {
				if (!globals_check || ZSTR_LEN(string_key) != sizeof("GLOBALS") - 1
						|| memcmp(ZSTR_VAL(string_key), "GLOBALS", sizeof("GLOBALS") - 1)) {
					zend_hash_update(dest, string_key, src_entry);
				} else if (Z_REFCOUNTED_P(src_entry)) {
					Z_DELREF_P(src_entry);
				}
			} else {
				zend_hash_index_update(dest, num_key, src_entry);
			}
		} else {
			SEPARATE_ARRAY(dest_entry);
			php_autoglobal_merge(Z_ARRVAL_P(dest_entry), Z_ARRVAL_P(src_entry));
		}
	} ZEND_HASH_FOREACH_END();
}

Project: php-src
File: php_variables.c

PHPAPI void php_build_argv(char *s, zval *track_vars_array)
{
	zval arr, argc, tmp;
	int count = 0;
	char *ss, *space;

	if (!(SG(request_info).argc || track_vars_array)) {
		return;
	}

	array_init(&arr);

	/* Prepare argv */
	if (SG(request_info).argc) { /* are we in cli sapi? */
		int i;
		for (i = 0; i < SG(request_info).argc; i++) {
			ZVAL_STRING(&tmp, SG(request_info).argv[i]);
			if (zend_hash_next_index_insert(Z_ARRVAL(arr), &tmp) == NULL) {
				zend_string_free(Z_STR(tmp));
			}
		}
	} else 	if (s && *s) {
		ss = s;
		while (ss) {
			space = strchr(ss, '+');
			if (space) {
				*space = '\0';
			}
			/* auto-type */
			ZVAL_STRING(&tmp, ss);
			count++;
			if (zend_hash_next_index_insert(Z_ARRVAL(arr), &tmp) == NULL) {
				zend_string_free(Z_STR(tmp));
			}
			if (space) {
				*space = '+';
				ss = space + 1;
			} else {
				ss = space;
			}
		}
	}

	/* prepare argc */
	if (SG(request_info).argc) {
		ZVAL_LONG(&argc, SG(request_info).argc);
	} else {
		ZVAL_LONG(&argc, count);
	}

	if (SG(request_info).argc) {
		Z_ADDREF(arr);
		zend_hash_str_update(&EG(symbol_table), "argv", sizeof("argv")-1, &arr);
		zend_hash_str_add(&EG(symbol_table), "argc", sizeof("argc")-1, &argc);
	}
	if (track_vars_array && Z_TYPE_P(track_vars_array) == IS_ARRAY) {
		Z_ADDREF(arr);
		zend_hash_str_update(Z_ARRVAL_P(track_vars_array), "argv", sizeof("argv")-1, &arr);
		zend_hash_str_update(Z_ARRVAL_P(track_vars_array), "argc", sizeof("argc")-1, &argc);
	}
	zval_ptr_dtor(&arr);
}

Project: php-src
File: php_variables.c

PHPAPI int php_hash_environment(void)
{
	memset(PG(http_globals), 0, sizeof(PG(http_globals)));
	zend_activate_auto_globals();
	if (PG(register_argc_argv)) {
		php_build_argv(SG(request_info).query_string, &PG(http_globals)[TRACK_VARS_SERVER]);
	}
	return SUCCESS;
}

Project: php-src
File: php_variables.c

static inline void php_register_server_variables(void)
{
	zval request_time_float, request_time_long;

	zval_ptr_dtor(&PG(http_globals)[TRACK_VARS_SERVER]);
	array_init(&PG(http_globals)[TRACK_VARS_SERVER]);

	/* Server variables */
	if (sapi_module.register_server_variables) {
		sapi_module.register_server_variables(&PG(http_globals)[TRACK_VARS_SERVER]);
	}

	/* PHP Authentication support */
	if (SG(request_info).auth_user) {
		php_register_variable("PHP_AUTH_USER", SG(request_info).auth_user, &PG(http_globals)[TRACK_VARS_SERVER]);
	}
	if (SG(request_info).auth_password) {
		php_register_variable("PHP_AUTH_PW", SG(request_info).auth_password, &PG(http_globals)[TRACK_VARS_SERVER]);
	}
	if (SG(request_info).auth_digest) {
		php_register_variable("PHP_AUTH_DIGEST", SG(request_info).auth_digest, &PG(http_globals)[TRACK_VARS_SERVER]);
	}

	/* store request init time */
	ZVAL_DOUBLE(&request_time_float, sapi_get_request_time());
	php_register_variable_ex("REQUEST_TIME_FLOAT", &request_time_float, &PG(http_globals)[TRACK_VARS_SERVER]);
	ZVAL_LONG(&request_time_long, zend_dval_to_lval(Z_DVAL(request_time_float)));
	php_register_variable_ex("REQUEST_TIME", &request_time_long, &PG(http_globals)[TRACK_VARS_SERVER]);
}

Project: php-src
File: php_variables.c

PHPAPI void php_register_variable(char *var, char *strval, zval *track_vars_array)
{
	php_register_variable_safe(var, strval, strlen(strval), track_vars_array);
}

Project: php-src
File: php_variables.c

PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars_array)
{
	char *p = NULL;
	char *ip = NULL;		/* index pointer */
	char *index;
	char *var, *var_orig;
	size_t var_len, index_len;
	zval gpc_element, *gpc_element_p;
	zend_bool is_array = 0;
	HashTable *symtable1 = NULL;
	ALLOCA_FLAG(use_heap)

	assert(var_name != NULL);

	if (track_vars_array && Z_TYPE_P(track_vars_array) == IS_ARRAY) {
		symtable1 = Z_ARRVAL_P(track_vars_array);
	}

	if (!symtable1) {
		/* Nothing to do */
		zval_dtor(val);
		return;
	}


	/* ignore leading spaces in the variable name */
	while (*var_name && *var_name==' ') {
		var_name++;
	}

	/*
	 * Prepare variable name
	 */
	var_len = strlen(var_name);
	var = var_orig = do_alloca(var_len + 1, use_heap);
	memcpy(var_orig, var_name, var_len + 1);

	/* ensure that we don't have spaces or dots in the variable name (not binary safe) */
	for (p = var; *p; p++) {
		if (*p == ' ' || *p == '.') {
			*p='_';
		} else if (*p == '[') {
			is_array = 1;
			ip = p;
			*p = 0;
			break;
		}
	}
	var_len = p - var;

	if (var_len==0) { /* empty variable name, or variable name with a space in it */
		zval_dtor(val);
		free_alloca(var_orig, use_heap);
		return;
	}

	/* GLOBALS hijack attempt, reject parameter */
	if (symtable1 == &EG(symbol_table) &&
		var_len == sizeof("GLOBALS")-1 &&
		!memcmp(var, "GLOBALS", sizeof("GLOBALS")-1)) {
		zval_dtor(val);
		free_alloca(var_orig, use_heap);
		return;
	}

	index = var;
	index_len = var_len;

	if (is_array) {
		int nest_level = 0;
		while (1) {
			char *index_s;
			size_t new_idx_len = 0;

			if(++nest_level > PG(max_input_nesting_level)) {
				HashTable *ht;
				/* too many levels of nesting */

				if (track_vars_array) {
					ht = Z_ARRVAL_P(track_vars_array);
					zend_symtable_str_del(ht, var, var_len);
				}

				zval_dtor(val);

				/* do not output the error message to the screen,
				 this helps us to to avoid "information disclosure" */
				if (!PG(display_errors)) {
					php_error_docref(NULL, E_WARNING, "Input variable nesting level exceeded " ZEND_LONG_FMT ". To increase the limit change max_input_nesting_level in php.ini.", PG(max_input_nesting_level));
				}
				free_alloca(var_orig, use_heap);
				return;
			}

			ip++;
			index_s = ip;
			if (isspace(*ip)) {
				ip++;
			}
			if (*ip==']') {
				index_s = NULL;
			} else {
				ip = strchr(ip, ']');
				if (!ip) {
					/* PHP variables cannot contain '[' in their names, so we replace the character with a '_' */
					*(index_s - 1) = '_';

					index_len = 0;
					if (index) {
						index_len = strlen(index);
					}
					goto plain_var;
					return;
				}
				*ip = 0;
				new_idx_len = strlen(index_s);
			}

			if (!index) {
				array_init(&gpc_element);
				if ((gpc_element_p = zend_hash_next_index_insert(symtable1, &gpc_element)) == NULL) {
					zval_ptr_dtor(&gpc_element);
					zval_dtor(val);
					free_alloca(var_orig, use_heap);
					return;
				}
			} else {
				gpc_element_p = zend_symtable_str_find(symtable1, index, index_len);
				if (!gpc_element_p) {
					zval tmp;
					array_init(&tmp);
					gpc_element_p = zend_symtable_str_update_ind(symtable1, index, index_len, &tmp);
				} else {
					if (Z_TYPE_P(gpc_element_p) == IS_INDIRECT) {
						gpc_element_p = Z_INDIRECT_P(gpc_element_p);
					}
					if (Z_TYPE_P(gpc_element_p) != IS_ARRAY) {
						zval_ptr_dtor(gpc_element_p);
						array_init(gpc_element_p);
					}
				}
			}
			symtable1 = Z_ARRVAL_P(gpc_element_p);
			/* ip pointed to the '[' character, now obtain the key */
			index = index_s;
			index_len = new_idx_len;

			ip++;
			if (*ip == '[') {
				is_array = 1;
				*ip = 0;
			} else {
				goto plain_var;
			}
		}
	} else {
plain_var:
		ZVAL_COPY_VALUE(&gpc_element, val);
		if (!index) {
			if ((gpc_element_p = zend_hash_next_index_insert(symtable1, &gpc_element)) == NULL) {
				zval_ptr_dtor(&gpc_element);
			}
		} else {
			/*
			 * According to rfc2965, more specific paths are listed above the less specific ones.
			 * If we encounter a duplicate cookie name, we should skip it, since it is not possible
			 * to have the same (plain text) cookie name for the same path and we should not overwrite
			 * more specific cookies with the less specific ones.
			 */
			if (Z_TYPE(PG(http_globals)[TRACK_VARS_COOKIE]) != IS_UNDEF &&
				symtable1 == Z_ARRVAL(PG(http_globals)[TRACK_VARS_COOKIE]) &&
				zend_symtable_str_exists(symtable1, index, index_len)) {
				zval_ptr_dtor(&gpc_element);
			} else {
				gpc_element_p = zend_symtable_str_update_ind(symtable1, index, index_len, &gpc_element);
			}
		}
	}
	free_alloca(var_orig, use_heap);
}

Project: php-src
File: php_variables.c

PHPAPI void php_register_variable_safe(char *var, char *strval, size_t str_len, zval *track_vars_array)
{
	zval new_entry;
	assert(strval != NULL);

	/* Prepare value */
	ZVAL_NEW_STR(&new_entry, zend_string_init(strval, str_len, 0));
	php_register_variable_ex(var, &new_entry, track_vars_array);
}

Project: php-src
File: php_variables.c

void php_startup_auto_globals(void)
{
	zend_register_auto_global(zend_string_init("_GET", sizeof("_GET")-1, 1), 0, php_auto_globals_create_get);
	zend_register_auto_global(zend_string_init("_POST", sizeof("_POST")-1, 1), 0, php_auto_globals_create_post);
	zend_register_auto_global(zend_string_init("_COOKIE", sizeof("_COOKIE")-1, 1), 0, php_auto_globals_create_cookie);
	zend_register_auto_global(zend_string_init("_SERVER", sizeof("_SERVER")-1, 1), PG(auto_globals_jit), php_auto_globals_create_server);
	zend_register_auto_global(zend_string_init("_ENV", sizeof("_ENV")-1, 1), PG(auto_globals_jit), php_auto_globals_create_env);
	zend_register_auto_global(zend_string_init("_REQUEST", sizeof("_REQUEST")-1, 1), PG(auto_globals_jit), php_auto_globals_create_request);
	zend_register_auto_global(zend_string_init("_FILES", sizeof("_FILES")-1, 1), 0, php_auto_globals_create_files);
}

Project: php-src
File: php_variables.c

zend_bool php_std_auto_global_callback(char *name, uint name_len)
{
	zend_printf("%s\n", name);
	return 0; /* don't rearm */
}