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

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Message-ID: <20230327093016.GB4253@hirez.programming.kicks-ass.net>
Date:   Mon, 27 Mar 2023 11:30:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dan Li <ashimida.1990@...il.com>
Cc:     Aaron Tomlin <atomlin@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
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Subject: Re: [RFC/RFT,V2] CFI: Add support for gcc CFI in aarch64

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?