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Date: Thu, 16 Mar 2017 00:50:14 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Shawn Webb <shawn.webb@hardenedbsd.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r315331 - in head/libexec/rtld-elf: . aarch64 amd64
 arm i386 mips powerpc powerpc64 riscv sparc64
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On Wed, Mar 15, 2017 at 05:19:54PM -0400, Shawn Webb wrote:
> On Wed, Mar 15, 2017 at 09:11:58PM +0000, Konstantin Belousov wrote:
> > Author: kib
> > Date: Wed Mar 15 21:11:57 2017
> > New Revision: 315331
> > URL: https://svnweb.freebsd.org/changeset/base/315331
> > 
> > Log:
> >   Implement LD_BIND_NOT knob for rtld.
> >   
> >   From the manpage:
> >   When set to a nonempty string, prevents modifications of the PLT slots
> >   when doing bindings.  As result, each call of the PLT-resolved
> >   function is resolved.  In combination with debug output, this provides
> >   complete account of all bind actions at runtime.
> >   
> >   Same feature exists on Linux and Solaris.
> >   
> >   Sponsored by:	The FreeBSD Foundation
> >   MFC after:	2 weeks
> 
> Hey Kostik,
> 
> I'm curious what the use case is for this. When would someone use
> LD_BIND_NOT?

The commit message explicitely describes the supposed use case, which also
triggered my implementation of the feature.