linux-kernel - Re: [RFC 1/9] mm, arm64: Update PR_SET/GET_TAGGED_ADDR

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Message-ID: <03b0f7d0-6b67-c48c-9250-ff4eadc221f2@intel.com>
Date:   Thu, 11 Feb 2021 09:06:12 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Will Deacon <will@...nel.org>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/9] mm, arm64: Update PR_SET/GET_TAGGED_ADDR_CTRL interface

Hi Catalin,

I noticed there are some ELF bits for ARM's BTI feature:

	GNU_PROPERTY_AARCH64_FEATURE_1_BTI

> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/elf.h#n453

There's been talk of needing a similar set of bits on x86 for tagged
pointers (LAM).  Do you have any plans to do something similar (ELF
property bits) for any of the pointer tagging features?