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Old 12-13-2006, 05:12 AM   #1
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exporting LD_LIBRARY_PATH problem

Hi all,
I've defined and exported LD_LIBRARY_PATH from .bash_profile. It is built as follows (lets assume it's user1):

export ENV1

export ENV2

Everything works well, until I su (no -). After switching to super-user, the environment variables ENV1 and ENV2 are proper:
ENV1 == /home/user1/version
ENV2 == /home/user2/version

However, LD_LIBRARY_PATH is not defined (the bash does not recognize it). I assume the shell treats LD_LIBRARY_PATH in a special way, but I'm not sure how to override it.

Anyone has any ideas?
Old 12-13-2006, 06:26 AM   #2
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You will have to add & export the LD_LIBRARY_PATH in root .bash_profile also, since .bash_profile is user specific

Last edited by sn68; 12-13-2006 at 06:27 AM.
Old 12-13-2006, 09:23 AM   #3
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Please note that I used "su" not "su -". As far as I understand, "su" alone does not invoke the bash scripts. I would like to maintain the environment variables values from user1, while gaining super-user permissions.
ENV1 and ENV2 are retained, while LD_LIBRARY_PATH is lost.

Old 12-14-2006, 09:34 AM   #4
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LD_LIBRARY_PATH is deleted when changing temporarily to root whether it is exported or not. This is done even when using su without the -. It is done, for example, when running a program with the sticky-bit turned on.
How to go around it:
You can create a temporary variable that is a copy of LD_LIBRARY_PATH in the user. In the root's .bashrc set LD_LIBRARY_PATH to the temporary variable (which is maintained passed the su command).
Just remember that this is certainly a security hole which can be exploited by malicious software and you should really-really want to do it.


export, ldlibrarypath

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