Re: binfmt_elf: use ELF_ET_DYN_BASE only for PIE breaks asan

[Kostya Serebryany <kcc@xxxxxxxxxx>]

On Mon, Aug 7, 2017 at 11:59 AM, Kees Cook <keescook@xxxxxxxxxx> wrote:

On Mon, Aug 7, 2017 at 11:56 AM, Kostya Serebryany <kcc@xxxxxxxxxx> wrote:
> Is it possible to implement some userspace<=>kernel interface that will
> allow applications (sanitizers)
> to request *fixed* address ranges from the kernel at startup (so that the
> kernel couldn't refuse)?

Wouldn't building non-PIE accomplish this?

Well, many asan users do need PIE. 

Then, non-PIE only applies to the main executable, all DSOs are still 

PIC and the old change that moved DSOs from 0x7fff to 0x5555 caused us quite a bit of trouble too, even w/o PIE

 

-Kees

--
Kees Cook
Pixel Security