test@ubuntu20-04:~$ uname -a Linux ubuntu20-04 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux test@ubuntu20-04:~$ cat /etc/*release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS" NAME="Ubuntu" VERSION="20.04 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04 LTS" VERSION_ID="20.04" HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; VERSION_CODENAME=focal UBUNTU_CODENAME=focal
** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875667 Title: root cannot flock user file in rwt dir if parent gives limited access Status in linux package in Ubuntu: New Bug description: 1. create folder by root 2. add wt permission flags to all in that folder 3. flock a file by user in that folder - success 4. flock the same file by root - error: Permission denied It is somehow important that user have limited access to parent folder (/ in this example). test@ubuntu20-04:~$ sudo rm -rf /t_rwt/ test@ubuntu20-04:~$ sudo mkdir /t_rwt test@ubuntu20-04:~$ sudo chmod a+wt /t_rwt test@ubuntu20-04:~$ flock /t_rwt/file echo aaa aaa test@ubuntu20-04:~$ sudo flock /t_rwt/file echo aaa flock: cannot open lock file /t_rwt/file: Permission denied test@ubuntu20-04:~$ ls -las /t_rwt total 8 4 drwxrwxrwt 2 root root 4096 Apr 28 08:01 . 4 drwxr-xr-x 26 root root 4096 Apr 28 08:00 .. 0 -rw-rw-r-- 1 test test 0 Apr 28 08:01 file test@ubuntu20-04:~$ id uid=1000(test) gid=1000(test) groups=1000(test),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),120(lpadmin),131(lxd),132(sambashare) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875667/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
