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Thu, 07 Sep 2017 10:37:08 -0700 (PDT) Received: from localhost.localdomain ([8.24.24.129]) by smtp.gmail.com with ESMTPSA id t127sm94404iod.26.2017.09.07.10.37.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 Sep 2017 10:37:07 -0700 (PDT) From: Tycho Andersen To: linux-kernel@vger.kernel.org Subject: [PATCH v6 05/11] arm64/mm: Add support for XPFO Date: Thu, 7 Sep 2017 11:36:03 -0600 Message-Id: <20170907173609.22696-6-tycho@docker.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170907173609.22696-1-tycho@docker.com> References: <20170907173609.22696-1-tycho@docker.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170907_103749_506330_9AF3EE8C X-CRM114-Status: GOOD ( 16.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marco Benatto , Tycho Andersen , kernel-hardening@lists.openwall.com, linux-mm@kvack.org, Juerg Haefliger , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Juerg Haefliger Enable support for eXclusive Page Frame Ownership (XPFO) for arm64 and provide a hook for updating a single kernel page table entry (which is required by the generic XPFO code). v6: use flush_tlb_kernel_range() instead of __flush_tlb_one() CC: linux-arm-kernel@lists.infradead.org Signed-off-by: Juerg Haefliger Signed-off-by: Tycho Andersen --- arch/arm64/Kconfig | 1 + arch/arm64/mm/Makefile | 2 ++ arch/arm64/mm/xpfo.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index dfd908630631..44fa44ef02ec 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -121,6 +121,7 @@ config ARM64 select SPARSE_IRQ select SYSCTL_EXCEPTION_TRACE select THREAD_INFO_IN_TASK + select ARCH_SUPPORTS_XPFO help ARM 64-bit (AArch64) Linux support. diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile index 9b0ba191e48e..22e5cab543d8 100644 --- a/arch/arm64/mm/Makefile +++ b/arch/arm64/mm/Makefile @@ -11,3 +11,5 @@ KASAN_SANITIZE_physaddr.o += n obj-$(CONFIG_KASAN) += kasan_init.o KASAN_SANITIZE_kasan_init.o := n + +obj-$(CONFIG_XPFO) += xpfo.o diff --git a/arch/arm64/mm/xpfo.c b/arch/arm64/mm/xpfo.c new file mode 100644 index 000000000000..678e2be848eb --- /dev/null +++ b/arch/arm64/mm/xpfo.c @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2017 Hewlett Packard Enterprise Development, L.P. + * Copyright (C) 2016 Brown University. All rights reserved. + * + * Authors: + * Juerg Haefliger + * Vasileios P. Kemerlis + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include +#include + +#include + +/* + * Lookup the page table entry for a virtual address and return a pointer to + * the entry. Based on x86 tree. + */ +static pte_t *lookup_address(unsigned long addr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + + pgd = pgd_offset_k(addr); + if (pgd_none(*pgd)) + return NULL; + + pud = pud_offset(pgd, addr); + if (pud_none(*pud)) + return NULL; + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + return NULL; + + return pte_offset_kernel(pmd, addr); +} + +/* Update a single kernel page table entry */ +inline void set_kpte(void *kaddr, struct page *page, pgprot_t prot) +{ + pte_t *pte = lookup_address((unsigned long)kaddr); + + set_pte(pte, pfn_pte(page_to_pfn(page), prot)); +} + +inline void xpfo_flush_kernel_tlb(struct page *page, int order) +{ + unsigned long kaddr = (unsigned long)page_address(page); + unsigned long size = PAGE_SIZE; + + flush_tlb_kernel_range(kaddr, kaddr + (1 << order) * size); +}