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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.
29 lines
534 B
PHP
29 lines
534 B
PHP
--TEST--
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Stack limit 009 - Check that we can actually use all the stack
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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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--FILE--
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<?php
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var_dump(zend_test_zend_call_stack_get());
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var_dump(zend_test_zend_call_stack_use_all());
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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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int(%d)
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