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From: Rich Felker <dalias@libc.org>
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Subject: Re: ldd not working on ET_EXEC executables
Date: Mon, 5 Dec 2016 21:33:25 -0500
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On Mon, Dec 05, 2016 at 07:39:32PM -0600, Laine Gholson wrote:
> Hello,
> 
> I am running musl on a ARM platform, and ldd won't work on a executable with the ET_EXEC type.
> 
> running GNU ld 2.25.1, gcc 6.2.0, and musl 1.1.15-git-71-g54991729
> 
>  $ gcc -fPIE -pie test.c -o test-pie
>  $ ldd test-pie
> <no error>
>  $ gcc -fno-PIE -no-pie test.c -o test-nopie
>  $ ldd test-nopie
> ldd: test-nopie: Not a valid dynamic program
>  $ elfedit --output-type DYN test-nopie
>  $ ldd test-nopie
> <no error>
> 
> Any idea why ldd says executables with the ET_EXEC type aren't valid?

strace it; I suspect you'll find that mmap is not honoring the
requested address. This is a bug introduced intentionally by grsec/pax
and perhaps other hardened kernels.

Rich