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Date: Thu, 15 Feb 2024 10:18:47 +0100
From: Szabolcs Nagy <nsz@port70.net>
To: enh <enh@google.com>
Cc: Rich Felker <dalias@libc.org>,
	William Roberts <bill.c.roberts@gmail.com>, musl@lists.openwall.com
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Subject: Re: [musl] PAC/BTI Support on aarch64

* enh <enh@google.com> [2024-02-14 16:22:05 -0800]:
> On Wed, Feb 14, 2024 at 4:03=E2=80=AFPM Szabolcs Nagy <nsz@port70.net> wr=
ote:
> > i.e. no equivalent to -Wa,--noexecstack we use for GNU_STACK
> > (this was an oversight, llvm added an option, binutils gas has none).
>=20
> what's the option? (since Android only supports llvm, that might be
> worth considering as a slight cleanup for us...)

-mmark-bti-property
https://releases.llvm.org/16.0.0/tools/clang/docs/ClangCommandLineReference=
=2Ehtml#cmdoption-clang-mmark-bti-property
https://reviews.llvm.org/D81930

> > as far as i know openssl is the reason android does not enable pac:
> > they added the hint instructions incorrectly at first so there are
> > binaries that fail if the hw enables pac.
>=20
> that was one reason why "android does not enable pac" _by default in
> the android target triples for app developers_, yes --- though i think
> we're at the point where we think we should flip that default (not
> least because the number of users whose devices would actually
> _benefit_ from the extra instructions is a lot larger now!):
> https://github.com/android/ndk/issues/1914

i see