Date: Fri, 24 Mar 2017 13:21:29 +0100 From: Andre Albsmeier <Andre.Albsmeier@siemens.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: Roger Marquis <marquis@roble.com>, freebsd-security@freebsd.org, Ed Maste <emaste@freebsd.org> Subject: Re: /tmp/ecp.* created during kernel build? Message-ID: <20170324122129.GA24947@bali> In-Reply-To: <A7D222D1-48AA-4F9D-97CC-A2D9B7DD7B95@FreeBSD.org> References: <alpine.BSF.2.11.1612271756590.79526@eboyr.pbz> <1612271904400.79526@mx5.roble.com> <A7D222D1-48AA-4F9D-97CC-A2D9B7DD7B95@FreeBSD.org>
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On Wed, 28-Dec-2016 at 12:31:49 +0100, Dimitry Andric wrote: > On 28 Dec 2016, at 04:10, Roger Marquis <marquis@roble.com> wrote: > > > >> 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? > > This looks like a minor bug in elfcopy, when used as objcopy, > specifically when in combination with the --input-target binary flag: > > $ mkdir /tmp/foo > $ export TMPDIR=/tmp/foo > $ ls -l /tmp/foo/ > $ /usr/bin/objcopy --input-target binary --output-target elf64-x86-64-freebsd --binary-architecture i386 cloudabi32_vdso.o bar.o > $ ls -l /tmp/foo > total 12 > -rw-r--r-- 1 dim wheel 10198 2016-12-28 12:29:32 ecp.0xbNAi5i > > E.g. for some reason this does not clean up the temporary file. strip (objcopy) does more curious things: $ cd /tmp $ cp /usr/lib/libc.a . $ strip --strip-debug libc.a $ strip --strip-debug libc.a [1] 960 segmentation fault strip --strip-debug libc.a Interesting is also that libc.a grows(!): Before the strip: -r--r----- 1 andre wheel 2622684 24 Mar 13:18 libc.a After: -r--r----- 1 andre wheel 2713792 24 Mar 13:19 libc.a -Andre > > -Dimitry > -- Never argue with an idiot. They drag you down to their level, then beat you with their experience.
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