Re: [PATCH 0/2] Support HWASAN with Intel LAM

[Uros Bizjak <ubizjak@gmail.com>]

On Mon, Nov 28, 2022 at 4:35 AM Hongtao Liu <crazylht@gmail.com> wrote:
>
> On Fri, Nov 11, 2022 at 9:26 AM liuhongt <hongtao.liu@intel.com> wrote:
> >
> >   2 years ago, ARM folks support HWASAN[1] in GCC[2], and introduced several
> > target hooks(Many thanks to their work) so other backends can do similar
> > things if they have similar feature.
> >   Intel LAM(linear Address Masking)[3 Charpter 14] supports similar feature with
> > the upper bits of pointers can be used as metadata, LAM support two modes:
> >   LAM_U48:bits 48-62 can be used as metadata
> >   LAM_U57:bits 57-62 can be used as metedata.
> >
> > These 2 patches mainly support those target hooks, but HWASAN is not really
> > enabled until the final decision for the LAM kernel interface which may take
> > quite a long time. We have verified our patches with a "fake" interface locally[4], and
> > decided to push the backend patches to the GCC13 to make other HWASAN developper's work
> > easy.
> >
> > [1] https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
> > [2] https://gcc.gnu.org/pipermail/gcc-patches/2020-November/557857.html
> > [3] https://www.intel.com/content/dam/develop/external/us/en/documents/architecture-instruction-set-extensions-programming-reference.pdf
> > [4] https://gitlab.com/x86-gcc/gcc/-/tree/users/intel/lam/master
> >
> >
> > Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
> > Ok for trunk?
> I'll install 2 patches if there's no objections in next 7 days.

FYI, I have no objection.

Uros.