Re: The address displayed by ldd

From: Kevin Puetz
Date: Sat Mar 12 2005 - 19:21:50 EST

It's the load address of the library, and it's basically not meant to be a
stable value. It will at least depend on the load order and size of the
libraries, and it may in fact be intentionally randomized each run as a
security measure against ret2libc type attacks (PaX, execshield, etc all do
this, as does prelink everytime it re-prelinks libraries). It's entirely
plausible for it to change from run to run, much less machine to machine.

gan_xiao_jun@xxxxxxxxx wrote:

> Hi,
> I have a small question,
> I am not sure if it belongs to kernel.
> I often use ldd to find librarys needed.
> In some systems,the address display by ldd not
> changes,
> But in other systems, it changes.
> What is the reason of the difference?
> Is it cause by some setting in kernel?
> Thanks in advance.
> gan
> __________________________________
> Do you Yahoo!?
> Yahoo! Mail - Find what you need with new enhanced search.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at