81 lines
3 KiB
Diff
81 lines
3 KiB
Diff
From 0692cf84257a92f7be9553af55d65c668e2b3bc8 Mon Sep 17 00:00:00 2001
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From: Dave Hansen <dave.hansen@linux.intel.com>
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Date: Mon, 4 Dec 2017 15:08:03 +0100
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Subject: [PATCH 214/233] x86/mm/pti: Add Kconfig
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Finally allow CONFIG_PAGE_TABLE_ISOLATION to be enabled.
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PARAVIRT generally requires that the kernel not manage its own page tables.
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It also means that the hypervisor and kernel must agree wholeheartedly
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about what format the page tables are in and what they contain.
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PAGE_TABLE_ISOLATION, unfortunately, changes the rules and they
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can not be used together.
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I've seen conflicting feedback from maintainers lately about whether they
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want the Kconfig magic to go first or last in a patch series. It's going
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last here because the partially-applied series leads to kernels that can
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not boot in a bunch of cases. I did a run through the entire series with
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CONFIG_PAGE_TABLE_ISOLATION=y to look for build errors, though.
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[ tglx: Removed SMP and !PARAVIRT dependencies as they not longer exist ]
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Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: David Laight <David.Laight@aculab.com>
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Cc: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: Eduardo Valentin <eduval@amazon.com>
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Cc: Greg KH <gregkh@linuxfoundation.org>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: Juergen Gross <jgross@suse.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Will Deacon <will.deacon@arm.com>
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Cc: aliguori@amazon.com
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Cc: daniel.gruss@iaik.tugraz.at
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Cc: hughd@google.com
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Cc: keescook@google.com
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Cc: linux-mm@kvack.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 385ce0ea4c078517fa51c261882c4e72fba53005)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit ce12963b837e809f6ae048587d9377a298c1094d)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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security/Kconfig | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/security/Kconfig b/security/Kconfig
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index 305b496ff6a3..91cb8f611a0d 100644
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--- a/security/Kconfig
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+++ b/security/Kconfig
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@@ -96,6 +96,16 @@ config SECURITY_NETWORK
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implement socket and networking access controls.
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If you are unsure how to answer this question, answer N.
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+config PAGE_TABLE_ISOLATION
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+ bool "Remove the kernel mapping in user mode"
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+ depends on X86_64 && !UML
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+ help
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+ This feature reduces the number of hardware side channels by
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+ ensuring that the majority of kernel addresses are not mapped
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+ into userspace.
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+
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+ See Documentation/x86/pagetable-isolation.txt for more details.
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+
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config SECURITY_INFINIBAND
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bool "Infiniband Security Hooks"
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depends on SECURITY && INFINIBAND
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--
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2.14.2
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