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cf77762970
Stack overflows can be detected as long as C stack frames between two execute_ex() calls use less than zend.reserved_stack_size bytes of stack. The default value of zend.reserved_stack_size accounts for the largest stack users, but MSAN instrumentation increases usage considerably: php_pcre2_match uses more than 200KiB of stack in some MSAN build, compared to 20KiB without MSAN according to -fstack-usage.
82 lines
1.5 KiB
PHP
82 lines
1.5 KiB
PHP
--TEST--
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Stack limit 001 - Stack limit checks with max_allowed_stack_size detection
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--SKIPIF--
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<?php
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if (getenv('SKIP_MSAN')) die("skip msan requires a considerably higher zend.reserved_stack_size due to instrumentation");
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?>
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--EXTENSIONS--
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zend_test
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--INI--
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; The test may use a large amount of memory on systems with a large stack limit
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memory_limit=2G
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--FILE--
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<?php
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var_dump(zend_test_zend_call_stack_get());
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class Test1 {
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public function __destruct() {
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new Test1;
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}
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}
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class Test2 {
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public function __clone() {
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clone $this;
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}
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}
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class Test3 {
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public function __sleep()
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{
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serialize($this);
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}
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}
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function replace() {
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return preg_replace_callback('#.#', function () {
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return replace();
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}, 'x');
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}
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try {
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new Test1;
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} catch (Error $e) {
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echo $e->getMessage(), "\n";
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}
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try {
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clone new Test2;
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} catch (Error $e) {
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echo $e->getMessage(), "\n";
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}
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try {
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serialize(new Test3);
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} catch (Error $e) {
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echo $e->getMessage(), "\n";
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}
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try {
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replace();
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} catch (Error $e) {
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echo $e->getMessage(), "\n";
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}
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?>
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--EXPECTF--
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array(4) {
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["base"]=>
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string(%d) "0x%x"
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["max_size"]=>
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string(%d) "0x%x"
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["position"]=>
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string(%d) "0x%x"
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["EG(stack_limit)"]=>
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string(%d) "0x%x"
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}
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Maximum call stack size of %d bytes reached. Infinite recursion?
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Maximum call stack size of %d bytes reached. Infinite recursion?
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Maximum call stack size of %d bytes reached. Infinite recursion?
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Maximum call stack size of %d bytes reached. Infinite recursion?
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