Fix GH-18281: making flock flags mutually exclusive. #18315
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devnexen
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mvorisek
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Apr 12, 2025
ext/standard/file.c
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| static inline bool php_is_valid_flock_flag(zend_long s) { | ||
| const zend_long sb = s & ~PHP_LOCK_NB; | ||
| return (sb == PHP_LOCK_UN || sb == PHP_LOCK_SH || | ||
| sb == PHP_LOCK_EX || s == -1); |
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It seems to be an accepted value (a test uses it) even tough it does nothing. I may discard it.
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In my understanding -1 flag implies all flags set, thus more than 1 exclusive flag set, thus it should not be allowed and hence this PR.
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proposing a standard way to detect bitwise values through a new Zend entry.