#40760 [NEW]: not honoring mode of shm_attach

From: secker at careviewcom dot com Operating system: Debian 'Etch', kern 2.6.17-2-486 PHP version: 5.2.1 PHP Bug Type: Unknown/Other Function Bug description: not honoring mode of shm_attach Description: ------------ If I create a Shared memory segment using shm_attach with one user, and set it as readable by all users, but only writable by the owner, then other users cannot open the segment via shm_attach, they get permission denied errors. I would guess this is maybe because shm_attach can't open a segment as read-only, and always tried to open it as rw? Reproduce code: --------------- run as someuser1: <?php $f = ftok('somefile', 'I'); $sh = shm_attach($f, 1024000, 0644); ?> works if its not already created by another user... run as someuser2: <?php $f = ftok('somefile', 'I'); $sh = shm_attach($f); ?> Expected result: ---------------- what I would expect is that since I created it as 0644, other users should be able to access it via read-only mode (which I can do if I open it using shmop_open with the read-only flag instead). Actual result: -------------- second user gets "Permission Denied" php warning messages. once again, I think this is mearly a result of shm_attach not actually ever opening an shm as read-only, always read-write... but I might be mistaken. Thanks. -- Edit bug report at http://bugs.php.net/?id=40760&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=40760&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=40760&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=40760&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=40760&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=40760&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=40760&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=40760&r=needscript Try newer version: http://bugs.php.net/fix.php?id=40760&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=40760&r=support Expected behavior: http://bugs.php.net/fix.php?id=40760&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=40760&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=40760&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=40760&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40760&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=40760&r=dst IIS Stability: http://bugs.php.net/fix.php?id=40760&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=40760&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=40760&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=40760&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=40760&r=mysqlcfg