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Message-ID: <20240215091847.GB1884416@port70.net>
Date: Thu, 15 Feb 2024 10:18:47 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: enh <enh@...gle.com>
Cc: Rich Felker <dalias@...c.org>,
William Roberts <bill.c.roberts@...il.com>, musl@...ts.openwall.com
Subject: Re: PAC/BTI Support on aarch64
* enh <enh@...gle.com> [2024-02-14 16:22:05 -0800]:
> On Wed, Feb 14, 2024 at 4:03 PM Szabolcs Nagy <nsz@...t70.net> wrote:
> > i.e. no equivalent to -Wa,--noexecstack we use for GNU_STACK
> > (this was an oversight, llvm added an option, binutils gas has none).
>
> 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.html#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.
>
> 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
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