From patchwork Fri Mar 12 00:49:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12133483 X-Patchwork-Delegate: bpf@iogearbox.net 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 C0344C4361A for ; Fri, 12 Mar 2021 00:50:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA6C864FB9 for ; Fri, 12 Mar 2021 00:50:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231458AbhCLAuS (ORCPT ); Thu, 11 Mar 2021 19:50:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231655AbhCLAtu (ORCPT ); Thu, 11 Mar 2021 19:49:50 -0500 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59F1AC061574 for ; Thu, 11 Mar 2021 16:49:50 -0800 (PST) Received: by mail-qv1-xf4a.google.com with SMTP id h12so16470230qvm.9 for ; Thu, 11 Mar 2021 16:49:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=x7nmddhtCAFSgIOj2697qGLSdd5adJgwaMu7EWSa7uE=; b=Xh/nq41/9MEWxm6t2iYy7IPJewLjv0iS/7KYlIJdOJ3bOfF46JUZMMZbt/Lbf7/LKe 0C1tO2vPCIwQ5PGJSYXZJ039Dvi3EAoKQxVkFOcDDW/pgCQxSf5VfmNszsM1rX066DfV ABqN34EZoCufg1IuApfGtoKYh4hGj4odHN2v6D0PPbtcxnhTw5RJfO/aIZwlt02AZCo2 HzHNQ6tS4vuStQQN4mpWyf+FUX+6L5uoIMBHOzFVAksdP/fKz3Mbmqp3eMuDvo3Z6d4F sEuuF7s32uR5mzuuW48zmaIsJUCAxpxJgvCXO0Q3ix21UAaACo2gUAOvee/rcFn3OFF1 XAhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=x7nmddhtCAFSgIOj2697qGLSdd5adJgwaMu7EWSa7uE=; b=HqPp+nafMHld21CMR+nUhhH6mUoxQ0cEf02pCVnZxTysuALUoxbpSXUQlyjETl/geP luiVuuMBC/ahWhl7la0Hbb/CBt/dqdwcUXEUC9HZNpXFHC1Wr4nY5hucZ8uDXESE077s 9JTPTcJTdB89CrKHXbo6/wksJzwWxM0gNuSYYclVMulFpqn9s0R+6TU2vP+Tb5fLPNF0 Qyw7niapbds5JnlwmyjVMpssYoKB8ImG3j5UfZ2KhIBwn8JLXshxV799aejLj4Ig41QQ 5iy5JWkEwbGbuWf5FBvfZTePRwcl3Ijnpcn5dtS3ZbpLh7koqT/dFpv+y9Ps8We9Xd8h V4cg== X-Gm-Message-State: AOAM530pPCz0+K5u1Ob2RiLb9yABfR3PH5yjb8R4izPMgTobPf0Hs1Hh 0GawtjRCIvWZ/qNhOrr2mT6T4mUn9SqmlxXCphI= X-Google-Smtp-Source: ABdhPJwmptuqD0+7nMK5L7NKwSOAsdIsIjIk7X0BlSf+Uv+Hui3fWlJBQOKwQ25g86AaX73W7AVFnXUyawNQmB/PfgY= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c86b:8269:af92:55a]) (user=samitolvanen job=sendgmr) by 2002:ad4:4904:: with SMTP id bh4mr9878463qvb.53.1615510189517; Thu, 11 Mar 2021 16:49:49 -0800 (PST) Date: Thu, 11 Mar 2021 16:49:17 -0800 In-Reply-To: <20210312004919.669614-1-samitolvanen@google.com> Message-Id: <20210312004919.669614-16-samitolvanen@google.com> Mime-Version: 1.0 References: <20210312004919.669614-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog Subject: [PATCH 15/17] arm64: add __nocfi to __apply_alternatives From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , 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, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org __apply_alternatives makes indirect calls to functions whose address is taken in assembly code using the alternative_cb macro. With non-canonical CFI, the compiler won't replace these function references with the jump table addresses, which trips CFI. Disable CFI checking in the function to work around the issue. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kernel/alternative.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 1184c44ea2c7..abc84636af07 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -133,8 +133,8 @@ static void clean_dcache_range_nopatch(u64 start, u64 end) } while (cur += d_size, cur < end); } -static void __apply_alternatives(void *alt_region, bool is_module, - unsigned long *feature_mask) +static void __nocfi __apply_alternatives(void *alt_region, bool is_module, + unsigned long *feature_mask) { struct alt_instr *alt; struct alt_region *region = alt_region;