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Date: Mon, 19 Feb 2024 15:54:58 -0800
From: Fangrui Song <>
Cc: William Roberts <>, Anton Korobeynikov <>
Subject: Re: PAC/BTI Support on aarch64

On Mon, Feb 12, 2024 at 10:42 AM Rich Felker <> wrote:
> On Mon, Feb 12, 2024 at 10:38:50AM -0600, William Roberts wrote:
> > Hello,
> >
> > I was just wondering if there was any work being done to support PAC
> > and BTI in aarch64? I could add support but didn't want to duplicate
> > the work.
> I'm not aware of any active work on this, but before writing a full
> implementation, it would be really helpful to start with a basic
> proposal for the scope of changes needed to make it work to assess
> whether these are managable and acceptable cost.
> Rich

Cc +Anton (other messages of this thread can be found at ).

and an lld/ELF patch


contains a prototype.

> We verified that LLVM testsuite compiled with pauth successfully passes on pauth-enabled AArch64 board.

It looks like there will be an LLVM Pointer Authentication discussion
in a few hours:

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