You need root, or CAP_ADMIN. Not really going to make it so you can write to it as normal user, since either of the other options is just as simple.
** Changed in: linux-source-2.6.19 (Ubuntu)
Status: Needs Info => Rejected
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/proc/sys/vm/drop_caches should be able to be configured to allow regular user
writes
https://launchpad.net/bugs/71575
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