Re: Matlab & LD_LIBRARY_PATH

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--- Matthew Saltzman <mjs@xxxxxxxxxxxxxxx> wrote:

> On Thu, 3 Aug 2006, Matthew Miller wrote:
> 
> > On Wed, Aug 02, 2006 at 11:48:49PM -0400, David Scriven wrote:
> >> One can set LD_LIBRARY_PATH manually - ie. from the prompt
> >> and things work fine.
> >>
> >> My guess that somewhere it is being UNSET, but I can't figure
> >> out where. This happens on different machines running either
> >> FC4 or FC5.
> >
> > Something must be "sanitizing" it for security reasons.
> Interesting.
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=164869
> 
> I recall running into this sometime around RH9.  I thought I had
> filed a 
> bug, but I can't find it now.  I did find this, though:
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=118262
> 
> And I wonder if the conclusion is relevant:
> 
>    Comment #3 From Jason Vas Dias:
>    This bug is blocked by glibc bug 129682 - no setuid/setgid program
>    can obtain LD_LIBRARY_PATH from the environment of a non-owner
>    invoking user.
> 
>    at could be converted to not require setuid/setgid bits to be set
> -
>    will work on this for next at version.
> 
>    Comment #4 From Jason Vas Dias:
>    It seems the glibc developers consider this not a bug,
>    but a security feature that is unlikely to be changed.
>    So you'll just have to set LD_LIBRARY_PATH manually
>    in your at jobs - it won't be recorded from your
>    invoking environment if you are not root.
> 
> For the reader's convenience:
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=129682
> 
> The question is, when logging in via the display manager, does
> something 
> setuid/setgid get run after .bash_profile?  Then, is there some
> startup 
> script that gets run after that program that could set the
> environment?
> 
> In my experience, logging in not via the display manager results in 
> LD_LIBRARY_PATH being set from .bash_profile as expected.
> 
> -- 
>  		Matthew Saltzman
> 
> Clemson University Math Sciences
> mjs AT clemson DOT edu
> http://www.math.clemson.edu/~mjs
> 
> -- 
> fedora-list mailing list
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> 

Hi Matthew,

There is a work-around - put it in /etc/bashrc and LD_LIBRARY_PATH
is set. Not optimal, but it works!

As far as setting it via /etc/profile - you are correct - booting
into a console (init 3) allows LD_LIBRARY_PATH to be set. Further
if you 'startx' LD_LIBRARY_PATH will still be set in whatever
display manager you are using.

However booting into X11 (init 5) prevents LD_LIBRARY_PATH from
being set.

The fact that you can legimately set it (init 3) would argue
against it being a security issue - it seems to be a mystery
that only people with greater knowledge than I can solve.

DS


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