From owner-freebsd-security@freebsd.org  Wed Dec 28 03:10:57 2016
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Date: Tue, 27 Dec 2016 19:10:56 -0800 (PST)
From: Roger Marquis <marquis@roble.com>
To: freebsd-security@freebsd.org
Subject: Re: /tmp/ecp.* created during kernel build?
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> Found a couple of ecp binaries in /tmp, apparently created concurrent
> with an 11.0 x86_64 kernel build.  Anyone else seen this?  Could they
> be related to a "make buildkernel"?

Confirmed 'make buildkernel' does create these files, apparently via
/usr/src/contrib/elftoolchain/elfcopy/main.c (thanks Adam).

Still odd that these are LSB binaries which don't run on this server and
nothing including cleanworld removed them.  Anyone audited elftoolchain
recently?

Roger