From patchwork Thu Apr 1 23:31:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12179971 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,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,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 86899C43600 for ; Thu, 1 Apr 2021 23:33:59 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 F18AA61158 for ; Thu, 1 Apr 2021 23:33:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F18AA61158 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.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=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Cc:To:From:Subject:Mime-Version:Message-Id:Date: 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=THxJLl15nsFfDQehxKWeUdZYEcW3AYbykkG0Ri74cVs=; b=mlrHcl1qoW8fLNyq6tAtPD/6q+ TFXlKR2oM20qkCeHeq300RtncTBBeUWvZDsX6s96/19K5lGmmqxRNWy1YbIfXirdRg4Sfii7YxmlJ RVkxjh9OHuCN1U6141d3UtqS+qUkB+1Gp06I+BE9f4pN+yVtEmFg4cJBIaK9OUKoLjTrKUzaRG3ZF XSiiETDNo0jOEUyePHe9SfUhv2oF9oBv54gOew/FgIXbGzy5t5w3ZSZsPQNMeldxOjWi5VcB073EW LjEEMwhHPsCLp1MxdAzifXmQExw3xEXdAW4SIFDlq2Wy+rfZ+m+7ObMVrABrfvu6PdJGAB1IWJHuW u5R1gOgA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lS6na-00BLxV-CY; Thu, 01 Apr 2021 23:32:26 +0000 Received: from mail-yb1-xb49.google.com ([2607:f8b0:4864:20::b49]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lS6nU-00BLvC-UE for linux-arm-kernel@lists.infradead.org; Thu, 01 Apr 2021 23:32:23 +0000 Received: by mail-yb1-xb49.google.com with SMTP id f75so7409696yba.8 for ; Thu, 01 Apr 2021 16:32:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=InV0o2ZlUPC6Ozgp8oy9RGMYSJbRTmoBDGoK3rQjBsY=; b=XOFf2TU/bBNAnTMUgJT1Ha9ov7VCwK7nKIEkSptSphT1lbyGKU0V4AUyA2V/MYUHdt mkzURWGQgvRNHgtxk14kZhXPP86rFZaDguPaANlC4nD7W2BOL7M5oaNfN/3RjZThiBRU 8jnfNKkLq8wKnSUDRsG25RI/qzCKFqzZGaau/0vhiuYUIrTzmt0cYGjy/X/r1/CVmcPe 7uvk9kzs5dJgdOB6qGUwJEe+xOIEuE7PV7c/XwCw/pKALImUnREFML4AsuEANkS5T3d1 YPKVhM1RiVWSOK0rBGOOwzBUWjWLGYHjQCP2cHsWej+0lRRgQZH5SoUiEXBTTImPmMz4 EMgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=InV0o2ZlUPC6Ozgp8oy9RGMYSJbRTmoBDGoK3rQjBsY=; b=qO2p6Bsdlt8esydg4RI7BwOObdyYbMirac4u7WxxST0SpoTo1pY5RCOJqiIxWnHgCW jbyilJUxaxRmuGgwsv/ulw+r1R4cj5S0Yvc7ZDmYLqDIZC/V/znSEWRxeexsbKYVm4+m zEekh34pj5Xcq+1vMqy8yviMbwo2Y+htCFHCLAL3VV9YYp3jdPEhFWHj6M0HbIIEBsR6 KqE+AtYYeFAbdCOxsq+d5/hnx/2ZgNXqp5rAjS1uvx9TlaCOoutTdv8PZJxOFp/r4bXH Z0uux8VlYny4ReNzqgfpZh58nwS3wIeerNZPKuh5ky8ubVFIDfgCTY9rus7CcBRPjmwv z8pA== X-Gm-Message-State: AOAM530kpQbDB85PdVaP0QDVVXbUZTUl8ka4O5QcGZ9YgSqGWZgkrO4K IxtGHcylisOhGjmAvwv6ywuxUD/12JolBeYUg3A= X-Google-Smtp-Source: ABdhPJw8U4+8a6xnoKEeF9jnElBn7ZABd4xVWQ50keTIqLwqC9rIV/rzVhLU65O3ettyCtJgo9KPlURBGa5LqGtbTsM= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:4cd1:da86:e91b:70b4]) (user=samitolvanen job=sendgmr) by 2002:a25:790d:: with SMTP id u13mr15103634ybc.427.1617319938477; Thu, 01 Apr 2021 16:32:18 -0700 (PDT) Date: Thu, 1 Apr 2021 16:31:58 -0700 Message-Id: <20210401233216.2540591-1-samitolvanen@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.0.208.g409f899ff0-goog Subject: [PATCH v5 00/18] Add support for Clang CFI From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , "Paul E. McKenney" , Christoph Hellwig , Peter Zijlstra , Sedat Dilek , Mark Rutland , Catalin Marinas , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210402_003221_165784_0965DEA9 X-CRM114-Status: GOOD ( 20.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series adds support for Clang's Control-Flow Integrity (CFI) checking. With CFI, the compiler injects a runtime check before each indirect function call to ensure the target is a valid function with the correct static type. This restricts possible call targets and makes it more difficult for an attacker to exploit bugs that allow the modification of stored function pointers. For more details, see: https://clang.llvm.org/docs/ControlFlowIntegrity.html The first patch contains build system changes and error handling, and implements support for cross-module indirect call checking. The remaining patches address issues caused by the compiler instrumentation. These include fixing known type mismatches, as well as issues with address space confusion and cross-module function address equality. These patches add support only for arm64, but I'll post patches also for x86_64 after we address the remaining issues there, including objtool support. You can also pull this series from https://github.com/samitolvanen/linux.git cfi-v5 Tested-by: Nathan Chancellor --- Changes in v5: - Changed module.lds.S to only include when CFI is enabled to fix the MIPS build. - Added a patch that fixes dynamic ftrace with CFI on arm64. Changes in v4: - Per Mark's suggestion, dropped __pa_function() and renamed __va_function() to function_nocfi(). - Added a comment to function_nocfi() to explain what it does. - Updated the psci patch to use an intermediate variable for the physical address for clarity. Changes in v3: - Added a patch to change list_sort() callers treewide to use const pointers instead of simply removing the internal casts. - Changed cleanup_symbol_name() to return bool. - Changed module.lds.S to drop the .eh_frame section only with CONFIG_CFI_CLANG. - Switched to synchronize_rcu() in update_shadow(). Changes in v2: - Fixed .text merging in module.lds.S. - Added WARN_ON_FUNCTION_MISMATCH() and changed kernel/thread.c and kernel/workqueue.c to use the macro instead. Sami Tolvanen (18): add support for Clang CFI cfi: add __cficanonical mm: add generic function_nocfi macro module: ensure __cfi_check alignment workqueue: use WARN_ON_FUNCTION_MISMATCH kthread: use WARN_ON_FUNCTION_MISMATCH kallsyms: strip ThinLTO hashes from static functions bpf: disable CFI in dispatcher functions treewide: Change list_sort to use const pointers lkdtm: use function_nocfi psci: use function_nocfi for cpu_resume arm64: implement function_nocfi arm64: use function_nocfi with __pa_symbol arm64: add __nocfi to functions that jump to a physical address arm64: add __nocfi to __apply_alternatives arm64: ftrace: use function_nocfi for ftrace_call KVM: arm64: Disable CFI for nVHE arm64: allow CONFIG_CFI_CLANG to be selected Makefile | 17 + arch/Kconfig | 45 +++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/memory.h | 15 + arch/arm64/include/asm/mmu_context.h | 4 +- arch/arm64/kernel/acpi_parking_protocol.c | 3 +- arch/arm64/kernel/alternative.c | 4 +- arch/arm64/kernel/cpu-reset.h | 10 +- arch/arm64/kernel/cpufeature.c | 4 +- arch/arm64/kernel/ftrace.c | 2 +- arch/arm64/kernel/psci.c | 3 +- arch/arm64/kernel/smp_spin_table.c | 3 +- arch/arm64/kvm/hyp/nvhe/Makefile | 6 +- arch/arm64/kvm/vgic/vgic-its.c | 8 +- arch/arm64/kvm/vgic/vgic.c | 3 +- block/blk-mq-sched.c | 3 +- block/blk-mq.c | 3 +- drivers/acpi/nfit/core.c | 3 +- drivers/acpi/numa/hmat.c | 3 +- drivers/clk/keystone/sci-clk.c | 4 +- drivers/firmware/psci/psci.c | 7 +- drivers/gpu/drm/drm_modes.c | 3 +- drivers/gpu/drm/i915/gt/intel_engine_user.c | 3 +- drivers/gpu/drm/i915/gvt/debugfs.c | 2 +- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 3 +- drivers/gpu/drm/radeon/radeon_cs.c | 4 +- .../hw/usnic/usnic_uiom_interval_tree.c | 3 +- drivers/interconnect/qcom/bcm-voter.c | 2 +- drivers/md/raid5.c | 3 +- drivers/misc/lkdtm/usercopy.c | 2 +- drivers/misc/sram.c | 4 +- drivers/nvme/host/core.c | 3 +- .../controller/cadence/pcie-cadence-host.c | 3 +- drivers/spi/spi-loopback-test.c | 3 +- fs/btrfs/raid56.c | 3 +- fs/btrfs/tree-log.c | 3 +- fs/btrfs/volumes.c | 3 +- fs/ext4/fsmap.c | 4 +- fs/gfs2/glock.c | 3 +- fs/gfs2/log.c | 2 +- fs/gfs2/lops.c | 3 +- fs/iomap/buffered-io.c | 3 +- fs/ubifs/gc.c | 7 +- fs/ubifs/replay.c | 4 +- fs/xfs/scrub/bitmap.c | 4 +- fs/xfs/xfs_bmap_item.c | 4 +- fs/xfs/xfs_buf.c | 6 +- fs/xfs/xfs_extent_busy.c | 4 +- fs/xfs/xfs_extent_busy.h | 3 +- fs/xfs/xfs_extfree_item.c | 4 +- fs/xfs/xfs_refcount_item.c | 4 +- fs/xfs/xfs_rmap_item.c | 4 +- include/asm-generic/bug.h | 16 + include/asm-generic/vmlinux.lds.h | 20 +- include/linux/bpf.h | 4 +- include/linux/cfi.h | 41 +++ include/linux/compiler-clang.h | 3 + include/linux/compiler_types.h | 8 + include/linux/init.h | 6 +- include/linux/list_sort.h | 7 +- include/linux/mm.h | 10 + include/linux/module.h | 13 +- include/linux/pci.h | 4 +- init/Kconfig | 2 +- kernel/Makefile | 4 + kernel/cfi.c | 329 ++++++++++++++++++ kernel/kallsyms.c | 55 ++- kernel/kthread.c | 3 +- kernel/module.c | 43 +++ kernel/workqueue.c | 2 +- lib/list_sort.c | 17 +- lib/test_list_sort.c | 3 +- net/tipc/name_table.c | 4 +- scripts/Makefile.modfinal | 2 +- scripts/module.lds.S | 19 +- 75 files changed, 759 insertions(+), 113 deletions(-) create mode 100644 include/linux/cfi.h create mode 100644 kernel/cfi.c base-commit: 6905b1dc3c32a094f0da61bd656a740f0a97d592