Re: [PATCH 0/6] File Sealing & memfd_create()

From: Colin Walters
Date: Thu Apr 10 2014 - 10:50:15 EST


On Thu, Mar 20, 2014 at 11:32 AM, tytso@xxxxxxx wrote:

Looking at your patches, and what files you are modifying, you are
enforcing this in the low-level file system.

I would love for this to be implemented in the filesystem level as well. Something like the ext4 immutable bit, but with the ability to still make hardlinks would be *very* useful for OSTree. And anyone else that uses hardlinks as a data source. The vserver people do something similiar:
http://linux-vserver.org/util-vserver:Vhashify

At the moment I have a read-only bind mount over /usr, but what I really want is to make the individual objects in the object store in /ostree/repo/objects be immutable, so even if a user or app navigates out to /sysroot they still can't mutate them (or the link targets in the visible /usr).




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