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Message-ID: <20221219132731.6ng4sz2nv6ujvu7i@ubuntu>
Date: Mon, 19 Dec 2022 05:32:04 -0800
From: Dan Li <ashimida.1990@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
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Mark Rutland <mark.rutland@....com>,
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Subject: Re: [RFC/RFT] CFI: Add support for gcc CFI in aarch64
Hi Peter,
On 12/19, Peter Zijlstra wrote:
> On Sun, Dec 18, 2022 at 10:17:58PM -0800, Dan Li wrote:
>
> > 1. When a typeid mismatch is detected, the cfi_check_failed function
> > will be called instead of the brk instruction. This function needs
> > to be implemented by the compiler user.
> > If there are user mode programs or other systems that want to use
> > this feature, it may be more convenient to use a callback (so this
> > compilation option is set to -fsanitize=cfi instead of kcfi).
>
> This is not going to be acceptible for x86_64.
I'm not familiar enough with the x86_64 platform, could you please
tell me why this is not acceptable? Is there a similar situation
on the arm64 platform?
> > 5. The current implementation of gcc only supports the aarch64 platform.
>
> What, if any, are the plans for x86_64 support?
I'd like to implement something similar on x86_64 later, but
currently I'm doing this in my spare time, so it might take a
little longer. :(
Thanks,
Dan
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