kernel: add missing ARM64_SSBD symbol

In 4.14.57, a new symbol for Spectre v4 mitigation was introduced for
ARM64. Add this symbol to all ARM64 targets using kernel 4.14.

This mitigates CVE-2018-3639 on ARM64.

Signed-off-by: Stijn Tintel <[email protected]>

target/linux/armvirt/64/config-default

@@ -42,6 +42,7 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP is not set
 # 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

target/linux/mediatek/mt7622/config-4.14

@@ -52,6 +52,7 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_CORE is not set
 # 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

target/linux/mvebu/cortexa53/config-default

@@ -36,6 +36,7 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_CORE is not set
 # 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

target/linux/mvebu/cortexa72/config-default

@@ -36,6 +36,7 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_CORE is not set
 # 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

target/linux/octeontx/config-4.14

@@ -54,6 +54,7 @@ CONFIG_ARM64_PAN=y
 # CONFIG_ARM64_PTDUMP_CORE is not set
 # 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

target/linux/sunxi/cortexa53/config-default

@@ -35,6 +35,7 @@ CONFIG_ARM64_PAGE_SHIFT=12
 # CONFIG_ARM64_PTDUMP_CORE is not set
 # 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