From patchwork Mon Feb 8 16:56:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincenzo Frascino X-Patchwork-Id: 12076055 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=-17.3 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 DA0B6C433E6 for ; Mon, 8 Feb 2021 16:57:44 +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 7203C64E8F for ; Mon, 8 Feb 2021 16:57:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7203C64E8F 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=qYdEZI22Px0Q3U9otfRqtp/3d1/xcH9oXBrHW5O3cmQ=; b=B7vHwyR+2+7w3HiekWg1iTyaZ4 CikJxnqGhYNMssGXUxI+vqTuK9ep3bRmOStymar5hajd8sXp9DVCWhJPXi2zqca7s/kpMbVwRTMmQ gL4WIsfMBejWo4gcgksFurgqIljaihHD1NnzpQQC80l9qs461mytgVXX7HXf+UqwvcGpNueGD7Ke+ R/4gT1InAxgN54ZrjenrTD49N7kK84R8DOmIGACBj9Yq/gzPP4CQhki4u6HxkvhY0zCuOOfIeOEYP t6Seg/5fWN3XVZFNFGjt9bma5BNz9HtSBxpUmCC8WsMNGabQzbkR7OhILC+57l1wFP5mIlDI1ymUe FtWkjORg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l99px-00053M-2w; Mon, 08 Feb 2021 16:56:33 +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 1l99pu-000526-PJ for linux-arm-kernel@lists.infradead.org; Mon, 08 Feb 2021 16:56:32 +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 8829C1FB; Mon, 8 Feb 2021 08:56:27 -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 A519F3F719; Mon, 8 Feb 2021 08:56:25 -0800 (PST) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v12 0/7] arm64: ARMv8.5-A: MTE: Add async mode support Date: Mon, 8 Feb 2021 16:56:10 +0000 Message-Id: <20210208165617.9977-1-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210208_115630_952079_C4465E7B X-CRM114-Status: GOOD ( 22.68 ) 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 , Lorenzo Pieralisi , Catalin Marinas , Branislav Rankov , Alexander Potapenko , Evgenii Stepanov , Andrey Konovalov , Andrey Ryabinin , Andrew Morton , Vincenzo Frascino , Will Deacon , Dmitry Vyukov 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 is based on linux-next/akpm. 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/v11.async.akpm Changes: -------- v12: - Fixed a bug affecting kernel functions allowed to read beyond buffer boundaries. - Added support for save/restore of TFSR_EL1 register during suspend/resume operations. - Rebased on latest linux-next/akpm. v11: - Added patch that disables KUNIT tests in async mode v10: - Rebase on the latest linux-next/akpm - Address review comments. v9: - Rebase on the latest linux-next/akpm - Address review comments. v8: - Address review comments. v7: - Fix a warning reported by kernel test robot. This time for real. v6: - Drop patches that forbid KASAN KUNIT tests when async mode is enabled. - Fix a warning reported by kernel test robot. - Address review comments. v5: - Rebase the series on linux-next/akpm. - Forbid execution for KASAN KUNIT tests when async mode is enabled. - Dropped patch to inline mte_assign_mem_tag_range(). - Address review comments. v4: - Added support for kasan.mode (sync/async) kernel command line parameter. - Addressed review comments. v3: - Exposed kasan_hw_tags_mode to convert the internal KASAN represenetation. - Added dsb() for kernel exit paths in arm64. - Addressed review comments. v2: - Fixed a compilation issue reported by krobot. - General cleanup. Cc: Andrew Morton 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 Cc: Lorenzo Pieralisi Signed-off-by: Vincenzo Frascino Andrey Konovalov (1): kasan: don't run tests in async mode Vincenzo Frascino (6): arm64: mte: Add asynchronous mode support kasan: Add KASAN mode kernel parameter kasan: Add report for async mode arm64: mte: Enable TCO in functions that can read beyond buffer limits arm64: mte: Enable async tag check fault arm64: mte: Save/Restore TFSR_EL1 during suspend Documentation/dev-tools/kasan.rst | 9 +++ arch/arm64/include/asm/memory.h | 3 +- arch/arm64/include/asm/mte-kasan.h | 9 ++- arch/arm64/include/asm/mte.h | 36 +++++++++++ arch/arm64/include/asm/uaccess.h | 19 ++++++ arch/arm64/include/asm/word-at-a-time.h | 4 ++ arch/arm64/kernel/entry-common.c | 6 ++ arch/arm64/kernel/mte.c | 84 ++++++++++++++++++++++++- arch/arm64/kernel/suspend.c | 3 + include/linux/kasan.h | 6 ++ lib/test_kasan.c | 6 +- mm/kasan/hw_tags.c | 52 ++++++++++++++- mm/kasan/kasan.h | 7 ++- mm/kasan/report.c | 17 ++++- 14 files changed, 251 insertions(+), 10 deletions(-)