From patchwork Thu Mar 18 17:11:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12148831 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, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 599E6C432C3 for ; Thu, 18 Mar 2021 17:12:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 453CA64EF2 for ; Thu, 18 Mar 2021 17:12:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232377AbhCRRMP (ORCPT ); Thu, 18 Mar 2021 13:12:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232398AbhCRRLq (ORCPT ); Thu, 18 Mar 2021 13:11:46 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61EDEC06174A for ; Thu, 18 Mar 2021 10:11:46 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id y26so23010161pga.10 for ; Thu, 18 Mar 2021 10:11:46 -0700 (PDT) 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=qy/qpaQcjeJGAGSX/SJfdvrV6+xztRS9WV/l31kV3fo=; b=c2hTTF5tVw2Zkjg2BQ/t8/oPhiKF2nLKpbN6o85lqbzdLuNwgLxdZtapB3jgv7Jtjn 5PPpgX2oj4cWhKsE+uMWJ510PLIzgH3HaO2mO51+/aXSn9MltdR+iyxrSmFuV8/OuxCq HEI4OcimcN242vISpRy0KAcVRLzmHZ/l71eQW7cg9ktaf+xkDMqexVxFVlz/23ieFoQE hk4tlgYSkhKIeFY1jby3Py3Ch++ovSOcAKpWSL5Sh/N7Jj48vC8xq9Vdd5eimNRIuQfl m5cjcZifAhB80labrIm2se6EWEROyemU19ZF5F75p0aKuw1WLupxSw9+ozFe9rhyZnj1 shcg== 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=qy/qpaQcjeJGAGSX/SJfdvrV6+xztRS9WV/l31kV3fo=; b=Iy6y0vi6R94/KuohrBeSE7lct9aw1IpbelT5KDinX4QjUtKgbl/vdnfk1PgWH1VtT2 MUN5oZr9AEEfwtQoRDVZ//cua033Rg1KQD/vSd1PuJOjgFbpuO+Ly5plI+kdetsXvqBC Deo0gF9lYjGHhObJWKf1A268FycxrONE8FlhwIriynmmFQD8R6OJ6BCrrAxpqRaHbSiu 3/ZOoRvfkBpWUxo0p9yjSuiTgBmpttM9XfCsFZZJKbj3XF8totHonV003hELro0JP+10 vzFQTQQoBo3ZrB0Vb45A16Wftlv9/HFyRTcz3LiPk292l5wsMOwggGvCRBCwlpn2hsXz wkhA== X-Gm-Message-State: AOAM533QiKh3buwq1tyS7LxbivzK2NQgyB3zORf0UkB2QMFvDDk6u5GW Yh2kMiu9ee4HtQHa0BVUZmd2emlR8zm5qKcakpQ= X-Google-Smtp-Source: ABdhPJzCXMFhAa2NKV6IDoPedF109qURHLuK0r/JIiSgzJgQstBmygmx77tZs7udLN2dCC5RnEr52xTHcy2QbI0lfG8= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c0d7:a7ba:fb41:a35a]) (user=samitolvanen job=sendgmr) by 2002:a17:90b:fcb:: with SMTP id gd11mr1106688pjb.0.1616087505409; Thu, 18 Mar 2021 10:11:45 -0700 (PDT) Date: Thu, 18 Mar 2021 10:11:08 -0700 In-Reply-To: <20210318171111.706303-1-samitolvanen@google.com> Message-Id: <20210318171111.706303-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20210318171111.706303-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v2 14/17] arm64: add __nocfi to functions that jump to a physical address 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 , 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 Disable CFI checking for functions that switch to linear mapping and make an indirect call to a physical address, since the compiler only understands virtual addresses and the CFI check for such indirect calls would always fail. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/include/asm/mmu_context.h | 2 +- arch/arm64/kernel/cpu-reset.h | 8 ++++---- arch/arm64/kernel/cpufeature.c | 2 +- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index 16cc9a694bb2..270ba8761a23 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -119,7 +119,7 @@ static inline void cpu_install_idmap(void) * Atomically replaces the active TTBR1_EL1 PGD with a new VA-compatible PGD, * avoiding the possibility of conflicting TLB entries being allocated. */ -static inline void cpu_replace_ttbr1(pgd_t *pgdp) +static inline void __nocfi cpu_replace_ttbr1(pgd_t *pgdp) { typedef void (ttbr_replace_func)(phys_addr_t); extern ttbr_replace_func idmap_cpu_replace_ttbr1; diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h index dfba8cf921e5..a05bda363272 100644 --- a/arch/arm64/kernel/cpu-reset.h +++ b/arch/arm64/kernel/cpu-reset.h @@ -13,10 +13,10 @@ void __cpu_soft_restart(unsigned long el2_switch, unsigned long entry, unsigned long arg0, unsigned long arg1, unsigned long arg2); -static inline void __noreturn cpu_soft_restart(unsigned long entry, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2) +static inline void __noreturn __nocfi cpu_soft_restart(unsigned long entry, + unsigned long arg0, + unsigned long arg1, + unsigned long arg2) { typeof(__cpu_soft_restart) *restart; diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 7ec1c2ccdc0b..473212ff4d70 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1443,7 +1443,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, } #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 -static void +static void __nocfi kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) { typedef void (kpti_remap_fn)(int, int, phys_addr_t);