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

Edit report at https://bugs.php.net/bug.php?id=79570&edit=1 ID: 79570 Updated by: nikic@php.net Reported by: zboszor at pr dot hu Summary: ZTS build of PHP 7.3.17 doesn't handle ERANGE for posix_getgrgid and others -Status: Verified +Status: Closed Type: Bug Package: POSIX related Operating System: Linux PHP Version: 7.3.17 Block user comment: N Private report: N New Comment: Automatic comment on behalf of zboszor@pr.hu Revision: http://git.php.net/?p=php-src.git;a=commit;h=6aff9a50cae40582d2571e7aa6f336d5c6a99547 Log: Fixed bug #79570 Previous Comments: ------------------------------------------------------------------------ [2020-06-17 17:59:16] alexdowad@php.net Can you submit the attached patch as a pull request to php-src in GitHub? Perhaps it may get more attention there. If you do not want to do this, I could also submit it on your behalf and credit you in the commit message. ------------------------------------------------------------------------ [2020-05-06 07:10:30] cmb@php.net Thanks for reporting! This has been missed when fixing bug #75696. ------------------------------------------------------------------------ [2020-05-06 06:53:48] zboszor at pr dot hu 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 this bug report at https://bugs.php.net/bug.php?id=79570&edit=1