From patchwork Wed Mar 31 21:27:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12176453 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 C3FE6C41538 for ; Wed, 31 Mar 2021 21:28:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A787861078 for ; Wed, 31 Mar 2021 21:28:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232866AbhCaV2W (ORCPT ); Wed, 31 Mar 2021 17:28:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232874AbhCaV1x (ORCPT ); Wed, 31 Mar 2021 17:27:53 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AAE7AC061574 for ; Wed, 31 Mar 2021 14:27:52 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id t24so2381030qkg.3 for ; Wed, 31 Mar 2021 14:27:52 -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=qCxq1N1gA7TwxAMFKmL7hLg9EO4lnSukatZLoaD+FFE=; b=KeQedqCHSppeGUQMSB3qvddKepeNQHx1p1/VSfzMSylvv0LONVB89TrLW3prq8oZLd GBGSMaPvGJnxYeqpyXqf46YXoIA4BadxdCS+/OCujIT/cSSW4RH6HuseJGcAaYs/B2h0 VPCq2Yot/QxDNIrN078Op8TpVyvUgNLnqtUsZWFs4jkRLeq3QIubrq+hsNm8jw0/sNbu x6ydT94rlxQyzBBmMXhSg1nR2cT5jJEpSyTDeTKaFhRS7JORrsdmSYdEe1cmftX7I5J0 WBiVyhSq+sZPQBRPdqZ0g2ebTLAodY/JCdgVHrXBLyUi190r5xfaOS+yUqmC2AQgYhO3 ejSg== 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=qCxq1N1gA7TwxAMFKmL7hLg9EO4lnSukatZLoaD+FFE=; b=SzeJcrJumguPqioKdnXqSTfB4gMzmAdfJuZf6KxVJXV3KFO4/AjF6YFfEkf9B/cJ8t UgSNR+XSTep0XupOHnAoz/LP07UFDe90oif9aXYfqWWWvJChMXckwdeqZlBNrW3LVjLu dv6XoG3dAESrg12vSPy+FxRLqrQM3ZSt8tMvtBLr3HjHiKkTzysqJ3n0v6Nc+n6240Xd kx0XdFZ9lzxwFmvI5rM0xgWgeVFxYiWvaG/ZsaZ5pwHVi2g6jEGo+LqVkKRkSE/FLgW0 t9YVRxYeLozZQXCtw5P70HrCmuLIEGkI3idI7P1vUkUxxUTw4+PpEg3CApYqu6azmvGG hEqA== X-Gm-Message-State: AOAM531j+euJsz7pmqUUqRUwrsYUoc+n2pJz/5sY7EOch7/5SosEC1IG wHzYTlDgQigQMdYndzB/dwt6cNxUdWcQk44rDpI= X-Google-Smtp-Source: ABdhPJx7XX2KOGLVRiBBOLjdMcWGg8SbFNRL+HOjMTa79TjDOvRh955y/RHVoyp83P6xuYihqrO7IRPK/3G0aLsMx0w= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:7933:7015:a5d5:3835]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:b04:: with SMTP id u4mr5243055qvj.0.1617226071830; Wed, 31 Mar 2021 14:27:51 -0700 (PDT) Date: Wed, 31 Mar 2021 14:27:18 -0700 In-Reply-To: <20210331212722.2746212-1-samitolvanen@google.com> Message-Id: <20210331212722.2746212-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20210331212722.2746212-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v4 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 , Peter Zijlstra , Sedat Dilek , 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 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 386b96400a57..d3cef9133539 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 f3adc574f969..9a7b1262ef17 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 ac616c59ae92..1cd7877deada 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1446,7 +1446,7 @@ 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);