linux-hardening - Re: [RFC/RFT,V2] CFI: Add support for gcc CFI in aarch64

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Date: Wed, 13 Dec 2023 16:48:50 +0800
From: Dan Li <ashimida.1990@...il.com>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Aaron Tomlin <atomlin@...hat.com>, 
	Alexander Potapenko <glider@...gle.com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
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	wanglikun@...iang.com
Subject: Re: [RFC/RFT,V2] CFI: Add support for gcc CFI in aarch64

+ Likun

On Tue, 28 Mar 2023 at 06:18, Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> On Mon, Mar 27, 2023 at 2:30 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > On Sat, Mar 25, 2023 at 01:54:16AM -0700, Dan Li wrote:
> >
> > > In the compiler part[4], most of the content is the same as Sami's
> > > implementation[3], except for some minor differences, mainly including:
> > >
> > > 1. The function typeid is calculated differently and it is difficult
> > > to be consistent.
> >
> > This means there is an effective ABI break between the compilers, which
> > is sad :-( Is there really nothing to be done about this?
>
> I agree, this would be unfortunate, and would also be a compatibility
> issue with rustc where there's ongoing work to support
> clang-compatible CFI type hashes:
>
> https://github.com/rust-lang/rust/pull/105452
>
> Sami