Force base address for an executable compiled with -fPIE

Asked Jul 19 '14 at 23:10

Active Jul 19 '14 at 23:10

Viewed 71 times

I'm here with a somewhat strange question.

Is there a way to exec a program and specify the VirtualAddress that it should be loaded at?

Example:

a.out is a PIE, with entry point 0x460.

b.out fork & exec's a.out, but tells it, "Hey, I want to you load the .text section at 0x200000, so the entry point is 0x200460".

I looked at the POSIX exec function family, ld.so, and ld-linux.so.2, but didn't see anything that would let be do this.

My immediate solution is to write my own linker, but if there's something that will let me do this already, that would make my life a lot easier.

Thanks!

asked Jul 19 '14 at 23:10

Neil

You could write your own loader: mmap the image, populate the PLT, and call the entry point. – Kerrek SB Jul 19 '14 at 23:16
Yeahhhhh, that's what I was thinking. Just hoping there was an avenue that I wasn't aware of. – Neil Jul 19 '14 at 23:18

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