linux-kernel - Re: [PATCH 0/6] File Sealing & memfd

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Date:	Thu, 10 Apr 2014 14:45:48 +0000
From:	Colin Walters <walters@...bum.org>
To:	tytso@....edu
Cc:	David Herrmann <dh.herrmann@...il.com>,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <matthew@....cx>,
	Karol Lewandowski <k.lewandowsk@...sung.com>,
	Kay Sievers <kay@...y.org>, Daniel Mack <zonque@...il.com>,
	Lennart Poettering <lennart@...ttering.net>,
	Kristian@...nk.org, john.stultz@...aro.org,
	Greg Kroah-Hartman <greg@...ah.com>, Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	dri-devel@...ts.freedesktop.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ryan Lortie <desrt@...rt.ca>, mtk.manpages@...il.com
Subject: Re: [PATCH 0/6] File Sealing & memfd_create()

On Thu, Mar 20, 2014 at 11:32 AM, tytso@....edu 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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