Bug #80492 [Com]: CHMOD does not work

Edit report at https://bugs.php.net/bug.php?id=80492&edit=1 ID: 80492 Comment by: dharman@php.net Reported by: gilperon at gmail dot com Summary: CHMOD does not work Status: Not a bug Type: Bug Package: *General Issues Operating System: CENTOS 7 and 8 PHP Version: 8.0.0 Block user comment: N Private report: N New Comment: Thanks for your interest in making PHP better but this is the correct behaviour. To change a file you need to have permissions or be the owner. However, to remove a file from a directory you need to have permissions for that directory or be the owner of that directory. If you have write permissions for the directory then you can remove files even ones you do not own. This is the correct behaviour of Linux systems and it is not the problem specific to PHP. Previous Comments: ------------------------------------------------------------------------ [2020-12-07 17:46:37] gilperon at gmail dot com peehaa@php.net what? Who says that's how it works? You? Check some example man page of chmod https://linux.die.net/man/1/chmod I checked others too, there is absolutetly nothing saying the permission should not be changed if the owner is not who is requesting the permission change. I AM NOT CHANGING owner, I am chaning the permission. There is no security implication since I can already delete and write to that file. I cant see how you came to the conclusion on your own. ------------------------------------------------------------------------ [2020-12-07 17:33:49] peehaa@php.net This is just how it works. To chmod a file you either need to be the owner or root ------------------------------------------------------------------------ [2020-12-07 17:30:43] gilperon at gmail dot com Description: ------------ This bug happens also on PHP 7.X and 8.X. When using PHP command "chmod(filename,persmission);" on a file owned by "root", PHP will say "Operation not permitted". Alright, it looks fine, since apache runs as "apache" user. HOWEVER I can easily use "unlink", "move_uploaded_file", "file_put_contents" and many other PHP functions on files OWNED BY ROOT and any other user. So why cant "chmod" change the file permission of a file that other PHP functions may well EVEN DELETE OR WRITE to that file, despite being owned by another user on ther server. I can see how this isnt a bug and it took me 3 hours to get to the bottom of it cause I couldnt belive what was happening since I could easily read/write to files but weirdly, "chmod" couldnt change permission. Test script: --------------- chdmod(filename,0777) Expected result: ---------------- permission should be shown Actual result: -------------- OPERATION NOT PERMITTED. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80492&edit=1