From patchwork Fri Mar 12 00:49:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12133479 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=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 9110AC432C3 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 70F4F64F92 for ; Fri, 12 Mar 2021 00:50:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231527AbhCLAuR (ORCPT ); Thu, 11 Mar 2021 19:50:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231321AbhCLAtr (ORCPT ); Thu, 11 Mar 2021 19:49:47 -0500 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6BD7C061765 for ; Thu, 11 Mar 2021 16:49:46 -0800 (PST) Received: by mail-qk1-x749.google.com with SMTP id 130so17026355qkm.0 for ; Thu, 11 Mar 2021 16:49:46 -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=ke/VK9feKGHIOdGZ0pPiwCA0H+8ezangCBgEAIc7UY8=; b=VEua8fI/YdbAAV+4vZE9LkkG6NVxbYTi4fRLVAQJzfNMohxQByrtWWMZlXvS9RQ8nE GCrQlGX4ECvM7L+7ShVYOcebSOytlurJV/W9GzVfy61t+13vR6iXIT3v1UZ+jyY1BeYR wQBYv8Oduzu+jPwNxOmMrTIBK+k2MNhOngjZrb+3mtmR/N463wuAVgjpNO6QMyDQdlGp fI74iB6pZmXATCWJHIMEIE1ELSESldUwtkUQ2woIlKymiMBAFWY/gPsczmQVWcgpL4RE PHiq5RzAAWrUYckK7pQsqJHgN14P5xf7CIR+jMOOtqlEeil1THtozna5tLtZEutzgSAp /elQ== 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=ke/VK9feKGHIOdGZ0pPiwCA0H+8ezangCBgEAIc7UY8=; b=VSej+Q0OHLr8P4Wr3LgrU4sLpc6lERVHXz3oASMJIdDl661l+q/udF3bHuA8guDEBm Ot9gaAIcdKEc3r5HN1wijWxxwb1SB1gBV8ao8hhZsYKz8HvHR/bIFvWQCl9zjSPsyHGX djB2gNKjlMENsYkKXTFuCJOYHvumIeL3pzlh4+6ehkBCXkYGxTmFddJbHcQ/XQgLPUgO EtfV0TJuuM7OJOKbcUxVpxiNP3uLgU57dzbfNFA9ZiZoanQ1+avICJf/69aevMJLWCUK tCEi+xZtY4iTz/Wh/IAYE0DjEqJOKnjnWqX4UFqTHoSpmmg3MbHDwkDgj1eQF8xRrTdu 6rFg== X-Gm-Message-State: AOAM530+KVTVlzHWUdS1LcegrDRbIJgNAjsBh9EeaDixPcZLaNm4t/PZ KBWfiXHmxvvkDShGJjGnXnRMlJ9//IVct1ZKfP8= X-Google-Smtp-Source: ABdhPJw9/Or/m/d2Vf6GucTmLluSf9xWrzOAepUCSiA4XOaY4VEMXGgCLe1+OE/2N7m70B9Io8cg6/HlLs/UXYJfABA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c86b:8269:af92:55a]) (user=samitolvanen job=sendgmr) by 2002:ad4:5901:: with SMTP id ez1mr9997276qvb.38.1615510185992; Thu, 11 Mar 2021 16:49:45 -0800 (PST) Date: Thu, 11 Mar 2021 16:49:15 -0800 In-Reply-To: <20210312004919.669614-1-samitolvanen@google.com> Message-Id: <20210312004919.669614-14-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 13/17] arm64: use __pa_function 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 With CONFIG_CFI_CLANG, the compiler replaces function address references with the address of the function's CFI jump table entry. This means that __pa_symbol(function) returns the physical address of the jump table entry, which can lead to address space confusion as the jump table points to the function's virtual address. Therefore, use the __pa_function() macro to ensure we are always taking the address of the actual function instead. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/include/asm/mmu_context.h | 2 +- arch/arm64/kernel/acpi_parking_protocol.c | 2 +- arch/arm64/kernel/cpu-reset.h | 2 +- arch/arm64/kernel/cpufeature.c | 2 +- arch/arm64/kernel/psci.c | 3 ++- arch/arm64/kernel/smp_spin_table.c | 2 +- 6 files changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index 70ce8c1d2b07..519d535532be 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -157,7 +157,7 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp) ttbr1 |= TTBR_CNP_BIT; } - replace_phys = (void *)__pa_symbol(idmap_cpu_replace_ttbr1); + replace_phys = (void *)__pa_function(idmap_cpu_replace_ttbr1); cpu_install_idmap(); replace_phys(ttbr1); diff --git a/arch/arm64/kernel/acpi_parking_protocol.c b/arch/arm64/kernel/acpi_parking_protocol.c index e7c941d8340d..e7f3af6043c5 100644 --- a/arch/arm64/kernel/acpi_parking_protocol.c +++ b/arch/arm64/kernel/acpi_parking_protocol.c @@ -99,7 +99,7 @@ static int acpi_parking_protocol_cpu_boot(unsigned int cpu) * that read this address need to convert this address to the * Boot-Loader's endianness before jumping. */ - writeq_relaxed(__pa_symbol(secondary_entry), &mailbox->entry_point); + writeq_relaxed(__pa_function(secondary_entry), &mailbox->entry_point); writel_relaxed(cpu_entry->gic_cpu_id, &mailbox->cpu_id); arch_send_wakeup_ipi_mask(cpumask_of(cpu)); diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h index ed50e9587ad8..dfba8cf921e5 100644 --- a/arch/arm64/kernel/cpu-reset.h +++ b/arch/arm64/kernel/cpu-reset.h @@ -22,7 +22,7 @@ static inline void __noreturn cpu_soft_restart(unsigned long entry, unsigned long el2_switch = !is_kernel_in_hyp_mode() && is_hyp_mode_available(); - restart = (void *)__pa_symbol(__cpu_soft_restart); + restart = (void *)__pa_function(__cpu_soft_restart); cpu_install_idmap(); restart(el2_switch, entry, arg0, arg1, arg2); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 066030717a4c..7ec1c2ccdc0b 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1460,7 +1460,7 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) if (arm64_use_ng_mappings) return; - remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); + remap_fn = (void *)__pa_function(idmap_kpti_install_ng_mappings); cpu_install_idmap(); remap_fn(cpu, num_online_cpus(), __pa_symbol(swapper_pg_dir)); diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index 62d2bda7adb8..bfb1a6f8282d 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -38,7 +38,8 @@ static int __init cpu_psci_cpu_prepare(unsigned int cpu) static int cpu_psci_cpu_boot(unsigned int cpu) { - int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry)); + int err = psci_ops.cpu_on(cpu_logical_map(cpu), + __pa_function(secondary_entry)); if (err) pr_err("failed to boot CPU%d (%d)\n", cpu, err); diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c index 056772c26098..a80ff9092e86 100644 --- a/arch/arm64/kernel/smp_spin_table.c +++ b/arch/arm64/kernel/smp_spin_table.c @@ -88,7 +88,7 @@ static int smp_spin_table_cpu_prepare(unsigned int cpu) * boot-loader's endianness before jumping. This is mandated by * the boot protocol. */ - writeq_relaxed(__pa_symbol(secondary_holding_pen), release_addr); + writeq_relaxed(__pa_function(secondary_holding_pen), release_addr); __flush_dcache_area((__force void *)release_addr, sizeof(*release_addr));