If you are setuid root, then you should be able to write to this file. It is mode 0644, and that is the only thing deciding the perms for it.
Can you provide a sample program that shows the problem? ** Changed in: linux-source-2.6.19 (Ubuntu) Status: Unconfirmed => Needs Info -- /proc/sys/vm/drop_caches should be able to be configured to allow regular user writes https://launchpad.net/bugs/71575 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs