linux-kernel - [PATCH 4.15 034/202] [Variant 3/Meltdown] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT

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Date:   Thu, 15 Feb 2018 16:15:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Laura Abbott <labbott@...hat.com>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 4.15 034/202] [Variant 3/Meltdown] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@....com>


Commit 084eb77cd3a8 upstream.

Add a Kconfig entry to control use of the entry trampoline, which allows
us to unmap the kernel whilst running in userspace and improve the
robustness of KASLR.

Reviewed-by: Mark Rutland <mark.rutland@....com>
Tested-by: Laura Abbott <labbott@...hat.com>
Tested-by: Shanker Donthineni <shankerd@...eaurora.org>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/Kconfig |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -843,6 +843,19 @@ config FORCE_MAX_ZONEORDER
 	  However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
 	  4M allocations matching the default size used by generic code.
 
+config UNMAP_KERNEL_AT_EL0
+	bool "Unmap kernel when running in userspace (aka \"KAISER\")"
+	default y
+	help
+	  Some attacks against KASLR make use of the timing difference between
+	  a permission fault which could arise from a page table entry that is
+	  present in the TLB, and a translation fault which always requires a
+	  page table walk. This option defends against these attacks by unmapping
+	  the kernel whilst running in userspace, therefore forcing translation
+	  faults for all of kernel space.
+
+	  If unsure, say Y.
+
 menuconfig ARMV8_DEPRECATED
 	bool "Emulate deprecated/obsolete ARMv8 instructions"
 	depends on COMPAT