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Date: Fri, 18 May 2007 18:04:56 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Peter Jeremy <peterjeremy@optushome.com.au>
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Cc: ports@freebsd.org
Subject: Re: Specs for saving old shared libs
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On Sat, May 19, 2007 at 07:47:30AM +1000, Peter Jeremy wrote:
> On 2007-May-18 17:50:58 +1000, Peter Jeremy <peter@turion.vk2pj.dyndns.org> wrote:
> >Ideally, you also need some way to identify (and remove) old .so files
> >that are no longer referenced by anything.  This is not as easy
> >because there's no record of what ports use what .so's (and no way to
> >track apps outside the ports system).
> 
> OK, my offering to assist with this scans a specified set of file
> trees and reports any executables that reference shared libraries in
> compat or that can't be found:
> 
> #!/bin/sh
> #
> # Find executables using compat libraries
> 
> find -x "$@" -type f -perm +0100 -print0 |\
>     ( xargs -0 ldd 2>&1 >&3 | \
> 	egrep -v "not a dynamic executable|can't read program header|Exec format error" >&2 ) 3>&1 |\
>     awk '/^[^ 	]/ { exe = $0; next }
>          NF != 4 || $3 ~ /\/compat\// || $4 !~ /^\(0x[0-9a-f]*[1-9a-f]/ { print exe, $0}'

For portupgrade users there is the libchk port which also looks for
references to libraries that are not installed.

Unfortunately thesedays there are a lot of false positives on typical
installations because lots of ports set a non-default library search
path at runtime.

Kris