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* [folded-merged] arm64-mte-add-in-kernel-tag-fault-handler-fix.patch removed from -mm tree
@ 2020-12-18 20:08 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2020-12-18 20:08 UTC (permalink / raw)
  To: mm-commits, vincenzo.frascino, glider, aryabinin, andreyknvl,
	catalin.marinas


The patch titled
     Subject: arm64: mte: ensure CONFIG_ARM64_PAN is enabled with MTE
has been removed from the -mm tree.  Its filename was
     arm64-mte-add-in-kernel-tag-fault-handler-fix.patch

This patch was dropped because it was folded into arm64-mte-add-in-kernel-tag-fault-handler.patch

------------------------------------------------------
From: Catalin Marinas <catalin.marinas@arm.com>
Subject: arm64: mte: ensure CONFIG_ARM64_PAN is enabled with MTE

The uaccess routines like get/put_user() rely on the user TCF0 mode
setting for tag checking.  However, if CONFIG_ARM64_PAN is disabled, these
routines would use the standard LDR/STR instructions and therefore the
kernel TCF mode.  In 5.10, the kernel TCF==0, so no tag checking, but this
will change with the in-kernel MTE support.

Make ARM64_MTE depend on ARM64_PAN.

Link: https://lkml.kernel.org/r/20201203102628.GB2224@gaia
Fixes: 89b94df9dfb1 ("arm64: mte: Kconfig entry")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/Kconfig |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm64/Kconfig~arm64-mte-add-in-kernel-tag-fault-handler-fix
+++ a/arch/arm64/Kconfig
@@ -1650,6 +1650,8 @@ config ARM64_MTE
 	default y
 	depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI
 	depends on AS_HAS_ARMV8_5
+	# Required for tag checking in the uaccess routines
+	depends on ARM64_PAN
 	select ARCH_USES_HIGH_VMA_FLAGS
 	help
 	  Memory Tagging (part of the ARMv8.5 Extensions) provides
_

Patches currently in -mm which might be from catalin.marinas@arm.com are

arm64-mte-add-in-kernel-tag-fault-handler.patch


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2020-12-18 20:08 [folded-merged] arm64-mte-add-in-kernel-tag-fault-handler-fix.patch removed from -mm tree akpm

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