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

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Message-ID: <20230405114846.udm4yf3xc6wdyexz@ubuntu>
Date:   Wed, 5 Apr 2023 04:48:46 -0700
From:   Dan Li <ashimida.1990@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Aaron Tomlin <atomlin@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
        Brian Gerst <brgerst@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Changbin Du <changbin.du@...el.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Frederic Weisbecker <frederic@...nel.org>,
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Subject: Re: [RFC/RFT,V2] CFI: Add support for gcc CFI in aarch64

On 03/27, Peter Zijlstra 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?

Hi Peter,

I'm not so sure right now. According to Sami's tip, I need to learn more about
related patches. I'll make it ABI compatible in the next version if possible :)

Thanks,
Dan