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=-16.8 required=3.0 tests=BAYES_00, 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 7DE35C433E0 for ; Fri, 15 Jan 2021 12:01:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E50023128 for ; Fri, 15 Jan 2021 12:01:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726455AbhAOMBk (ORCPT ); Fri, 15 Jan 2021 07:01:40 -0500 Received: from foss.arm.com ([217.140.110.172]:36736 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725910AbhAOMBj (ORCPT ); Fri, 15 Jan 2021 07:01:39 -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 7716AED1; Fri, 15 Jan 2021 04:00:53 -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 CB7AD3F70D; Fri, 15 Jan 2021 04:00:51 -0800 (PST) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Cc: Vincenzo Frascino , Catalin Marinas , Will Deacon , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Branislav Rankov , Andrey Konovalov Subject: [PATCH v3 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Date: Fri, 15 Jan 2021 12:00:39 +0000 Message-Id: <20210115120043.50023-1-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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-rc3. 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 Changes: -------- 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: 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 | 47 +++++++++++++++++++++- arch/arm64/kernel/entry-common.c | 11 ++++++ arch/arm64/kernel/mte.c | 63 ++++++++++++++++++++++++++++-- arch/arm64/lib/mte.S | 15 ------- include/linux/kasan.h | 1 + include/linux/kasan_def.h | 10 +++++ mm/kasan/hw_tags.c | 19 ++++++++- mm/kasan/kasan.h | 2 +- 10 files changed, 151 insertions(+), 24 deletions(-) create mode 100644 include/linux/kasan_def.h -- 2.30.0 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=unavailable 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 7FF19C433DB for ; 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Fri, 15 Jan 2021 04:00:51 -0800 (PST) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v3 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Date: Fri, 15 Jan 2021 12:00:39 +0000 Message-Id: <20210115120043.50023-1-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-20210115_070056_014262_394D6D9E X-CRM114-Status: GOOD ( 19.65 ) 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 , Branislav Rankov , Alexander Potapenko , Evgenii Stepanov , Andrey Konovalov , Andrey Ryabinin , Vincenzo Frascino , Will Deacon , 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-rc3. 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 Changes: -------- 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: 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 | 47 +++++++++++++++++++++- arch/arm64/kernel/entry-common.c | 11 ++++++ arch/arm64/kernel/mte.c | 63 ++++++++++++++++++++++++++++-- arch/arm64/lib/mte.S | 15 ------- include/linux/kasan.h | 1 + include/linux/kasan_def.h | 10 +++++ mm/kasan/hw_tags.c | 19 ++++++++- mm/kasan/kasan.h | 2 +- 10 files changed, 151 insertions(+), 24 deletions(-) create mode 100644 include/linux/kasan_def.h -- 2.30.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel