| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.15 016/202] [Variant 3/Meltdown] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN | Date | Thu, 15 Feb 2018 16:15:16 +0100 |
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4.15-stable review patch. If anyone has any objections, please let me know.
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From: Will Deacon <will.deacon@arm.com>
Commit 376133b7edc2 upstream.
We're about to rework the way ASIDs are allocated, switch_mm is implemented and low-level kernel entry/exit is handled, so keep the ARM64_SW_TTBR0_PAN code out of the way whilst we do the heavy lifting.
It will be re-enabled in a subsequent patch.
Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Tested-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/arm64/Kconfig | 1 + 1 file changed, 1 insertion(+)
--- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -920,6 +920,7 @@ endif config ARM64_SW_TTBR0_PAN bool "Emulate Privileged Access Never using TTBR0_EL1 switching" + depends on BROKEN # Temporary while switch_mm is reworked help Enabling this option prevents the kernel from accessing user-space memory directly by pointing TTBR0_EL1 to a reserved
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