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Date: Sat, 21 Oct 2017 11:03:02 -0500
From: "Serge E. Hallyn" <serge@...lyn.com>
To: Nicolas Belouin <nicolas@...ouin.fr>
Cc: Jan Kara <jack@...e.com>, Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Kleikamp <shaggy@...nel.org>,
	Mark Fasheh <mfasheh@...sity.com>, Joel Becker <jlbec@...lplan.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Phillip Lougher <phillip@...ashfs.org.uk>,
	Richard Weinberger <richard@....at>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Serge Hallyn <serge@...lyn.com>, Paul Moore <paul@...l-moore.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <james.l.morris@...cle.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	jfs-discussion@...ts.sourceforge.net, ocfs2-devel@....oracle.com,
	linux-unionfs@...r.kernel.org, reiserfs-devel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-api@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [RFC PATCH 1/2] security, capabilities: create CAP_TRUSTED

Quoting Nicolas Belouin (nicolas@...ouin.fr):
> with CAP_SYS_ADMIN being bloated, the usefulness of using it to
> flag a process to be entrusted for e.g reading and writing trusted
> xattr is near zero.
> CAP_TRUSTED aims to provide userland with a way to mark a process as
> entrusted to do specific (not specially admin-centered) actions. It
> would for example allow a process to red/write the trusted xattrs.

You say "for example".  Are you intending to add more uses?  If so, what
are they?  If not, how about renaming it CAP_TRUSTED_XATTR?

What all does allowing writes to trusted xattrs give you?  There are
the overlayfs whiteouts, what else?

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