Re: x86: PIE support and option to extend KASLR randomization
From: Kees Cook <hidden>
Date: 2017-09-22 18:57:09
Also in:
kvm, linux-arch, linux-crypto
On Fri, Sep 22, 2017 at 11:38 AM, H. Peter Anvin [off-list ref] wrote:
We lose EBX on 32 bits, but we don't lose RBX on 64 bits - since x86-64 has RIP-relative addressing there is no need for a dedicated PIC register.
FWIW, since gcc 5, the PIC register isn't totally lost. It is now reusable, and that seems to have improved performance: https://gcc.gnu.org/gcc-5/changes.html -Kees -- Kees Cook Pixel Security