Bug #81638 [NEW]: a set of functions about file state will not work correctly

From: inhann at qq dot com Operating system: linux PHP version: 7.4.26 Package: Streams related Bug Type: Bug Bug description:a set of functions about file state will not work correctly Description: ------------ any function whose definition is started with FileFunction(PHP_FN in ext/standard/filestat.c will call the system call ,stat , in linux , which will finally return false when recieving a path with more than 20 symbolic links the affected functions are as follows: fileperms、fileinode、filesize、fileowner、filegroup、fileatime、filemtime、filectime、filetype、is_writable、is_readable、is_executable、is_file、is_dir、is_link、file_exists ........ you can read ext/standard/filestat.c to find more Test script: --------------- <?php $f = "/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/etc/passwd"; var_dump(file_exists($f)); readfile($f); ?> file exists but file_exists($f) return false , is_writable、is_readable、is_executable、is_file、is_dir、is_link、file_exists ...... will return false as well Expected result: ---------------- bool(true) the content of /etc/passwd Actual result: -------------- bool(false) the content of /etc/passwd -- Edit bug report at https://bugs.php.net/bug.php?id=81638&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81638&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81638&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81638&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81638&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81638&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81638&r=support Expected behavior: https://bugs.php.net/fix.php?id=81638&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81638&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81638&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81638&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81638&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81638&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81638&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81638&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81638&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81638&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81638&r=mysqlcfg