81 lines
3 KiB
Diff
81 lines
3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Dave Hansen <dave.hansen@linux.intel.com>
|
|
Date: Mon, 4 Dec 2017 15:08:03 +0100
|
|
Subject: [PATCH] x86/mm/pti: Add Kconfig
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
CVE-2017-5754
|
|
|
|
Finally allow CONFIG_PAGE_TABLE_ISOLATION to be enabled.
|
|
|
|
PARAVIRT generally requires that the kernel not manage its own page tables.
|
|
It also means that the hypervisor and kernel must agree wholeheartedly
|
|
about what format the page tables are in and what they contain.
|
|
PAGE_TABLE_ISOLATION, unfortunately, changes the rules and they
|
|
can not be used together.
|
|
|
|
I've seen conflicting feedback from maintainers lately about whether they
|
|
want the Kconfig magic to go first or last in a patch series. It's going
|
|
last here because the partially-applied series leads to kernels that can
|
|
not boot in a bunch of cases. I did a run through the entire series with
|
|
CONFIG_PAGE_TABLE_ISOLATION=y to look for build errors, though.
|
|
|
|
[ tglx: Removed SMP and !PARAVIRT dependencies as they not longer exist ]
|
|
|
|
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
Cc: Andy Lutomirski <luto@kernel.org>
|
|
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
Cc: Borislav Petkov <bp@alien8.de>
|
|
Cc: Brian Gerst <brgerst@gmail.com>
|
|
Cc: David Laight <David.Laight@aculab.com>
|
|
Cc: Denys Vlasenko <dvlasenk@redhat.com>
|
|
Cc: Eduardo Valentin <eduval@amazon.com>
|
|
Cc: Greg KH <gregkh@linuxfoundation.org>
|
|
Cc: H. Peter Anvin <hpa@zytor.com>
|
|
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
Cc: Juergen Gross <jgross@suse.com>
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
Cc: Will Deacon <will.deacon@arm.com>
|
|
Cc: aliguori@amazon.com
|
|
Cc: daniel.gruss@iaik.tugraz.at
|
|
Cc: hughd@google.com
|
|
Cc: keescook@google.com
|
|
Cc: linux-mm@kvack.org
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
(cherry picked from commit 385ce0ea4c078517fa51c261882c4e72fba53005)
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
(cherry picked from commit ce12963b837e809f6ae048587d9377a298c1094d)
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
---
|
|
security/Kconfig | 10 ++++++++++
|
|
1 file changed, 10 insertions(+)
|
|
|
|
diff --git a/security/Kconfig b/security/Kconfig
|
|
index 305b496ff6a3..91cb8f611a0d 100644
|
|
--- a/security/Kconfig
|
|
+++ b/security/Kconfig
|
|
@@ -96,6 +96,16 @@ config SECURITY_NETWORK
|
|
implement socket and networking access controls.
|
|
If you are unsure how to answer this question, answer N.
|
|
|
|
+config PAGE_TABLE_ISOLATION
|
|
+ bool "Remove the kernel mapping in user mode"
|
|
+ depends on X86_64 && !UML
|
|
+ help
|
|
+ This feature reduces the number of hardware side channels by
|
|
+ ensuring that the majority of kernel addresses are not mapped
|
|
+ into userspace.
|
|
+
|
|
+ See Documentation/x86/pagetable-isolation.txt for more details.
|
|
+
|
|
config SECURITY_INFINIBAND
|
|
bool "Infiniband Security Hooks"
|
|
depends on SECURITY && INFINIBAND
|
|
--
|
|
2.14.2
|
|
|