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=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 152E9C433DB for ; Wed, 6 Jan 2021 11:58:12 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7E28123106 for ; Wed, 6 Jan 2021 11:58:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7E28123106 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=8YfV2PEjKvxQfFBzlPuz/cMW/e4nm1XD2P+SRnDrU4Y=; b=NHdRhVEj6LCRyQM1mTHVh2GoI5 1KH7kkoSNrvkOY3nVr/vfb5gJigGXu4pDydfXNXUWLH4skU7ML2dn3L8b8Jg3RJpJTulUGqz151Dy C8AWycyTM/AcLGuluq3uChTjt5mfZOjxnJAFzBVwGq0Q8kuRSV1JDAC6+HDb0n0+XFP4wK1AACb0x Fqv0SUneIGHCt1LAJpvZqxJjqHsYwk6eOyLRkpbOLHDGdKzobK8sIvqPrEeVFWvxfLm+5SKramLyf T/HvVvZf5KBp33ih2Ko/+0ahOLftRmIktUDMW7WCLuhvvLO3EacBV+x/VcwelJR9yj5Gw55Kg9a20 rl6BiYMg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kx7Qh-0003NO-N3; Wed, 06 Jan 2021 11:56:43 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kx7Qe-0003MI-AL for linux-arm-kernel@lists.infradead.org; Wed, 06 Jan 2021 11:56:41 +0000 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 D0D26D6E; Wed, 6 Jan 2021 03:56:38 -0800 (PST) Received: from e119884-lin.cambridge.arm.com (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2F3E53F70D; Wed, 6 Jan 2021 03:56:37 -0800 (PST) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Date: Wed, 6 Jan 2021 11:55:15 +0000 Message-Id: <20210106115519.32222-1-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210106_065640_470290_213E8F1A X-CRM114-Status: GOOD ( 18.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marco Elver , Catalin Marinas , Will Deacon , Branislav Rankov , Alexander Potapenko , Evgenii Stepanov , Andrey Konovalov , Andrey Ryabinin , Vincenzo Frascino , Dmitry Vyukov Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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 -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel