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List:       busybox
Subject:    Re: [BusyBox] can only execute from root directory
From:       Brendan J Simon <brendan.simon () ctam ! com ! au>
Date:       2002-07-29 21:09:07
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Fixed.  I stuffed around with the build system sometime ago so that it 
would build in a directory different to the source directoy.  I managed 
to solve this particular problem by adding the / to DYNAMIC_LINKER in 
Rules.mak.  The reason for this is my setting for SHARED_LIB_LOADER is 
not absolute.

Changing build systems can be fraught with much danger.  My new method 
is to create a symlink tree to the sources via a simple script or maybe 
even "cp -s".  This is a lot quicker than rewriting someone else's build 
system and probably much safer.

Cheers,
Brendan Simon.



Brendan J Simon wrote:

>
> I previously posted a message saying that I can't execute programs 
> that are copied to tmpfs filesystem on /tmp.  This message is 
> erroneous.  I found that I can not execute any executable that is not 
> in the root directory.  Well not 100% true.  It seems that busybox 
> (and symlinked friends) work OK from any directory but my apps do 
> not.  I used readelf to try and find some differences.  It seems that 
> the  requesting program interpreter is different.
>
> My apps have: [Requesting program interpreter: lib/ld-uClibc.so.0]
> Busybox has: [Requesting program interpreter: /lib/ld-uClibc.so.0]
>
> Note the missing slash before "lib" which makes it an absolute path 
> rather than a relative path.  I think this is the problem as the error 
> message I get when trying to run my apps from somewhere other than / 
> is "/usr/local/bin/myprog: No such file or directory"
>
> I don't know why the / is missing.  It must have something to do with 
> the install directory not being absolute when I built uClibc.
> Any ideas ???
>
> I can get around it with "-Wl,--dynamic-linker,/lib/ld-uClibc.so.0" 
> but it shouldn't really be necessary.
>
> Cheers,
> Bendan Simon.
>
>
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