Bug #75696 [Ver->Csd]: posix_getgrnam fails to print details of group

Edit report at https://bugs.php.net/bug.php?id=75696&edit=1 ID: 75696 Updated by: cmb@php.net Reported by: jas at eecs dot yorku dot ca Summary: posix_getgrnam fails to print details of group -Status: Verified +Status: Closed Type: Bug Package: POSIX related Operating System: CentOS 7.4 PHP Version: 7.2.0 Block user comment: N Private report: N New Comment: Automatic comment on behalf of cmbecker69@gmx.de Revision: http://git.php.net/?p=php-src.git;a=commit;h=2677d438502b68a967d46ffadfadc138070ce762 Log: Fix #75696: posix_getgrnam fails to print details of group Previous Comments: ------------------------------------------------------------------------ [2018-08-24 16:14:15] cmb@php.net <https://github.com/php/php-src/pull/3464> submitted. ------------------------------------------------------------------------ [2018-08-21 15:08:32] cmb@php.net As requinix already said, what apparently happens is that sysconf(_SC_GETGR_R_SIZE_MAX) returns a size which is insufficient (which is allowed by the POSIX spec[1]), and so the following getgrnam_r() fails with ERANGE[2]. posix_getgrnam() could then try again with an increased (doubled?) buffer size. Please try the attached patch (try-again). [1] <http://pubs.opengroup.org/onlinepubs/9699919799/functions/getgrnam.html> [2] <https://github.com/php/php-src/blob/php-7.3.0beta2/ext/posix/posix.c#L1079-L1090> ------------------------------------------------------------------------ [2018-08-21 15:07:54] cmb@php.net The following patch has been added/updated: Patch Name: try-again Revision: 1534864074 URL: https://bugs.php.net/patch-display.php?bug=75696&patch=try-again&revision=1534864074 ------------------------------------------------------------------------ [2018-08-21 14:19:46] jas at eecs dot yorku dot ca Thanks! Just to confirm - it's therefore a bug in PHP since I can't tell it how much buffer to allocate for the call, right? ------------------------------------------------------------------------ [2018-08-21 14:16:35] requinix@php.net 34 is ERANGE. Here it means PHP underestimated the amount of space necessary for a buffer to hold all the information for that group - obviously exhausted by that list of members. It could try again with a larger buffer. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=75696 -- Edit this bug report at https://bugs.php.net/bug.php?id=75696&edit=1