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Date: Thu, 16 Dec 2010 17:00:57 +0000 (UTC)
From: Ralf Wildenhues <Ralf.Wildenhues@....de>
To: oss-security@...ts.openwall.com
Subject: Re: Breaking the links: Exploiting the linker
Hello Tim, all,
Tim Brown <timb@...> writes:
>
> In the interests of a thorough peer review I'd be curious what people think
> of the following paper I've been working on Linux and POSIX linkers:
>
> http://www.nth-dimension.org.uk/downloads.php?id=77
Replacing
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/dir/name
with
LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-/dir/name}
changes semantics in a way that are not generally desirable: if I want to
append a directory to the search path, then the latter is not the way to
do it (because it doesn't change the path if the variable is already set).
Rather, I think you meant
LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-$LD_LIBRARY_PATH:}/dir/name
(no quotes are needed on the right hand side of the '=' sign, as the shell
doesn't word-split there).
On page 5, the footnotes have several markup errors resulting in weird PDF
output.
I suggest using the url package for nicer URL typesetting (in case you're
writing this with LaTeX) and the hyperref package with
\hypersetup{pdfborder={0 0 0}} for decent clickable links.
So much for a quick look.
Cheers,
Ralf
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