Bug #79570 [NEW]: ZTS build of PHP 7.3.17 doesn't handle ERANGE for posix_getgrgid and others

From: zboszor at pr dot hu Operating system: Linux PHP version: 7.3.17 Package: POSIX related Bug Type: Bug Bug description:ZTS build of PHP 7.3.17 doesn't handle ERANGE for posix_getgrgid and others Description: ------------ ZTS build of PHP uses getgrnam_r, getgrgid_r, getpwnam_r and getpwuid_r behind their respective posix_* functions. These functions may return ERANGE if the buffer supplied by the caller is too small. sysconf() returns 1024 for _SC_GETGR_R_SIZE_MAX and _SC_GETPW_R_SIZE_MAX. Only posix_getgrnam calling getgrnam_r handles ERANGE properly by retrying with a larger buffer. This was noticed on a system with a group containing many users, so the respective line in /etc/group exceeded 2KB. Test script: --------------- <?php $i = 200; /* a GID that has a very long line in /etc/group */ $data = posix_getgrgid($i); $error_num = posix_get_last_error(); if ($error_num > 0) { echo "\nERROR NUM = $error_num\n"; echo "ERROR MES = " . posix_strerror($error_num) . "\n\n"; } else { printf("%s\n", $data["name"]); } ?> Expected result: ---------------- The group name should be printed. Actual result: -------------- Error number 34 (ERANGE) is printed. -- Edit bug report at https://bugs.php.net/bug.php?id=79570&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79570&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79570&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79570&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79570&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79570&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79570&r=support Expected behavior: https://bugs.php.net/fix.php?id=79570&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79570&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79570&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79570&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79570&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79570&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79570&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79570&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79570&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79570&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79570&r=mysqlcfg