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Date: Mon, 19 May 2003 14:37:42 -0400 (EDT)
From: Robert Watson <rwatson@FreeBSD.org>
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To: Terry Lambert <tlambert2@mindspring.com>
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Subject: Re: 5.1-RELEASE TODO
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On Mon, 19 May 2003, Terry Lambert wrote:

> Robert Watson wrote:
> >    |-------------------+-------------+---------------+----------------------|
> >    |                   |             |               | Update the run-time  |
> >    | rtld-elf          | --          | Alexander     | link editor (rtld)   |
> >    | thread-safety     |             | Kabaev        | thread-safe with     |
> >    |                   |             |               | libpthread.          |
> >    |-------------------+-------------+---------------+----------------------|
> 
> According to chapter 12 of the "Go Solo 2" book, this is a bogus thing
> to do.  Callers are required to take a critical section over the calls
> to the dl* functions because the dlerror() function uses a static buffer
> that can be overwritten in a multi-threaded environment. 

Sadly, that insight doesn't seem to have influenced the development
practices of a number of major application vendors :-(. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Network Associates Laboratories