This appears to be due to an intentional change in behavior to improve security which I believe was introduced in 19.10. To restore the older behavior, create `/etc/sysctl.d/protect-links.conf` with the contents:
fs.protected_regular = 0 Then restart procps: sudo systemctl restart procps.service To verify run: $ sudo sysctl fs.protected_regular fs.protected_regular = 0 References: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=30aba6656f61ed44cba445a3c0d38b296fa9e8f5 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915797 ** Bug watch added: Debian Bug tracker #915797 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915797 ** Changed in: linux (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1875667 Title: root cannot flock user file in rwt dir if parent gives limited access To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875667/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
