From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9EB4C433DB for ; Wed, 6 Jan 2021 16:32:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C45D23131 for ; Wed, 6 Jan 2021 16:32:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727226AbhAFQci (ORCPT ); Wed, 6 Jan 2021 11:32:38 -0500 Received: from foss.arm.com ([217.140.110.172]:43816 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725800AbhAFQci (ORCPT ); Wed, 6 Jan 2021 11:32:38 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 11169D6E; Wed, 6 Jan 2021 08:31:52 -0800 (PST) Received: from [10.37.8.33] (unknown [10.37.8.33]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EC2883F719; Wed, 6 Jan 2021 08:31:49 -0800 (PST) Subject: Re: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Cc: Catalin Marinas , Will Deacon , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Branislav Rankov , Andrey Konovalov , Will Deacon References: <20210106115519.32222-1-vincenzo.frascino@arm.com> From: Vincenzo Frascino Message-ID: <9a78cd4f-838d-0410-62fa-16e4ab921681@arm.com> Date: Wed, 6 Jan 2021 16:35:29 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210106115519.32222-1-vincenzo.frascino@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/6/21 11:55 AM, Vincenzo Frascino wrote: > This patchset implements the asynchronous mode support for ARMv8.5-A > Memory Tagging Extension (MTE), which is a debugging feature that allows > to detect with the help of the architecture the C and C++ programmatic > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > subset of its address space that is multiple of a 16 bytes granule. MTE > is based on a lock-key mechanism where the lock is the tag associated to > the physical memory and the key is the tag associated to the virtual > address. > When MTE is enabled and tags are set for ranges of address space of a task, > the PE will compare the tag related to the physical memory with the tag > related to the virtual address (tag check operation). Access to the memory > is granted only if the two tags match. In case of mismatch the PE will raise > an exception. > > The exception can be handled synchronously or asynchronously. When the > asynchronous mode is enabled: > - Upon fault the PE updates the TFSR_EL1 register. > - The kernel detects the change during one of the following: > - Context switching > - Return to user/EL0 > - Kernel entry from EL1 > - Kernel exit to EL1 > - If the register has been updated by the PE the kernel clears it and > reports the error. > > The series contains as well an optimization to mte_assign_mem_tag_range(). > > The series is based on linux 5.11-rc2. > > To simplify the testing a tree with the new patches on top has been made > available at [1]. > > [1] https://git.gitlab.arm.com/linux-arm/linux-vf.git mte/v10.async > > Cc: Catalin Marinas > Cc: Will Deacon Will is not in arm anymore :( Sorry Will... I will fix this in v2. > Cc: Dmitry Vyukov > Cc: Andrey Ryabinin > Cc: Alexander Potapenko > Cc: Marco Elver > Cc: Evgenii Stepanov > Cc: Branislav Rankov > Cc: Andrey Konovalov > Signed-off-by: Vincenzo Frascino > > Vincenzo Frascino (4): > kasan, arm64: Add KASAN light mode > arm64: mte: Add asynchronous mode support > arm64: mte: Enable async tag check fault > arm64: mte: Optimize mte_assign_mem_tag_range() > > arch/arm64/include/asm/memory.h | 2 +- > arch/arm64/include/asm/mte-kasan.h | 5 ++- > arch/arm64/include/asm/mte.h | 27 +++++++++++- > arch/arm64/kernel/entry-common.c | 6 +++ > arch/arm64/kernel/mte.c | 67 ++++++++++++++++++++++++++++-- > arch/arm64/lib/mte.S | 15 ------- > include/linux/kasan.h | 1 + > include/linux/kasan_def.h | 39 +++++++++++++++++ > mm/kasan/hw_tags.c | 24 ++--------- > mm/kasan/kasan.h | 2 +- > 10 files changed, 145 insertions(+), 43 deletions(-) > create mode 100644 include/linux/kasan_def.h > -- Regards, Vincenzo