[OpenWrt-Devel] [PATCH 02/10] kernel: Activate CONFIG_ARM64_SW_TTBR0_PAN

Hauke Mehrtens hauke at hauke-m.de
Fri May 3 16:51:59 EDT 2019 

This activates "Emulate Privileged Access Never using TTBR0_EL1
switching" on ARM64.

This should prevent the kernel from reading code from user space in
kernel context.

Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/armvirt/64/config-default        | 1 -
 target/linux/brcm2708/bcm2710/config-4.14     | 1 -
 target/linux/generic/config-4.14              | 1 +
 target/linux/generic/config-4.19              | 1 +
 target/linux/layerscape/armv8_64b/config-4.14 | 1 -
 target/linux/mediatek/mt7622/config-4.14      | 1 -
 target/linux/mvebu/cortexa53/config-default   | 1 -
 target/linux/mvebu/cortexa72/config-default   | 1 -
 target/linux/octeontx/config-4.14             | 1 -
 target/linux/sunxi/cortexa53/config-4.14      | 1 -
 target/linux/sunxi/cortexa53/config-4.19      | 1 -
 11 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/target/linux/armvirt/64/config-default b/target/linux/armvirt/64/config-default
index e5c05b3160..23d038cbb6 100644
--- a/target/linux/armvirt/64/config-default
+++ b/target/linux/armvirt/64/config-default
@@ -43,7 +43,6 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 CONFIG_ARM64_UAO=y
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/brcm2708/bcm2710/config-4.14 b/target/linux/brcm2708/bcm2710/config-4.14
index 9faf7f762a..00e3c0c2e5 100644
--- a/target/linux/brcm2708/bcm2710/config-4.14
+++ b/target/linux/brcm2708/bcm2710/config-4.14
@@ -60,7 +60,6 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 CONFIG_ARM64_UAO=y
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/generic/config-4.14 b/target/linux/generic/config-4.14
index e607c6dc80..f9834b8cf8 100644
--- a/target/linux/generic/config-4.14
+++ b/target/linux/generic/config-4.14
@@ -285,6 +285,7 @@ CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
 # CONFIG_ARM64_ERRATUM_845719 is not set
 # CONFIG_ARM64_ERRATUM_858921 is not set
 # CONFIG_ARM64_RELOC_TEST is not set
+CONFIG_ARM64_SW_TTBR0_PAN=y
 # CONFIG_ARM_APPENDED_DTB is not set
 # CONFIG_ARM_ARCH_TIMER is not set
 # CONFIG_ARM_BIG_LITTLE_CPUFREQ is not set
diff --git a/target/linux/generic/config-4.19 b/target/linux/generic/config-4.19
index 7e1528f517..dc392ebb56 100644
--- a/target/linux/generic/config-4.19
+++ b/target/linux/generic/config-4.19
@@ -296,6 +296,7 @@ CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
 # CONFIG_ARM64_ERRATUM_858921 is not set
 # CONFIG_ARM64_RAS_EXTN is not set
 # CONFIG_ARM64_RELOC_TEST is not set
+CONFIG_ARM64_SW_TTBR0_PAN=y
 # CONFIG_ARM_APPENDED_DTB is not set
 # CONFIG_ARM_ARCH_TIMER is not set
 # CONFIG_ARM_BIG_LITTLE_CPUFREQ is not set
diff --git a/target/linux/layerscape/armv8_64b/config-4.14 b/target/linux/layerscape/armv8_64b/config-4.14
index 782da4e3fb..b925c3c03e 100644
--- a/target/linux/layerscape/armv8_64b/config-4.14
+++ b/target/linux/layerscape/armv8_64b/config-4.14
@@ -65,7 +65,6 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 CONFIG_ARM64_UAO=y
 CONFIG_ARM64_VA_BITS=48
 # CONFIG_ARM64_VA_BITS_39 is not set
diff --git a/target/linux/mediatek/mt7622/config-4.14 b/target/linux/mediatek/mt7622/config-4.14
index 86951e198a..58ab6642fc 100644
--- a/target/linux/mediatek/mt7622/config-4.14
+++ b/target/linux/mediatek/mt7622/config-4.14
@@ -53,7 +53,6 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 CONFIG_ARM64_UAO=y
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/mvebu/cortexa53/config-default b/target/linux/mvebu/cortexa53/config-default
index 674a294460..b0dd2ee39e 100644
--- a/target/linux/mvebu/cortexa53/config-default
+++ b/target/linux/mvebu/cortexa53/config-default
@@ -37,7 +37,6 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 # CONFIG_ARM64_UAO is not set
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/mvebu/cortexa72/config-default b/target/linux/mvebu/cortexa72/config-default
index 61c3998bb1..8598471f4c 100644
--- a/target/linux/mvebu/cortexa72/config-default
+++ b/target/linux/mvebu/cortexa72/config-default
@@ -37,7 +37,6 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 # CONFIG_ARM64_UAO is not set
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/octeontx/config-4.14 b/target/linux/octeontx/config-4.14
index 09d22d517f..8925ead14d 100644
--- a/target/linux/octeontx/config-4.14
+++ b/target/linux/octeontx/config-4.14
@@ -55,7 +55,6 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 CONFIG_ARM64_UAO=y
 CONFIG_ARM64_VA_BITS=48
 # CONFIG_ARM64_VA_BITS_39 is not set
diff --git a/target/linux/sunxi/cortexa53/config-4.14 b/target/linux/sunxi/cortexa53/config-4.14
index b46c4aa414..adb71fca7e 100644
--- a/target/linux/sunxi/cortexa53/config-4.14
+++ b/target/linux/sunxi/cortexa53/config-4.14
@@ -35,7 +35,6 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 # CONFIG_ARM64_UAO is not set
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
diff --git a/target/linux/sunxi/cortexa53/config-4.19 b/target/linux/sunxi/cortexa53/config-4.19
index a35c84b905..2f79acdbc8 100644
--- a/target/linux/sunxi/cortexa53/config-4.19
+++ b/target/linux/sunxi/cortexa53/config-4.19
@@ -37,7 +37,6 @@ CONFIG_ARM64_PA_BITS_48=y
 # CONFIG_ARM64_PTDUMP_DEBUGFS is not set
 # CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET is not set
 CONFIG_ARM64_SSBD=y
-# CONFIG_ARM64_SW_TTBR0_PAN is not set
 # CONFIG_ARM64_UAO is not set
 CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
-- 
2.20.1


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