[PATCH] ArmVirtPkg/ArmVirt.dsc.inc: AARCH64: enable DXE image protection feature

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Enable the new DXE image protection for all image, i.e., FV images but
also external images that originate from disk or the network, such as
OS loaders.

This complements work that is underway on the arm64/Linux kernel side,
to emit the OS loader with 4 KB section alignment, and a suitable split
between code and data.

http://marc.info/?l=linux-arm-kernel&m=148655557227819

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmVirtPkg/ArmVirt.dsc.inc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ArmVirtPkg/ArmVirt.dsc.inc b/ArmVirtPkg/ArmVirt.dsc.inc
index dbd6678accde..c0d5e7c6aa6d 100644
--- a/ArmVirtPkg/ArmVirt.dsc.inc
+++ b/ArmVirtPkg/ArmVirt.dsc.inc
@@ -17,6 +17,9 @@ [Defines]
   DEFINE DEBUG_PRINT_ERROR_LEVEL = 0x8000004F
   DEFINE TTY_TERMINAL            = FALSE
 
+[BuildOptions.common.EDKII.DXE_DRIVER,BuildOptions.common.EDKII.UEFI_DRIVER,BuildOptions.common.EDKII.UEFI_APPLICATION]
+  GCC:*_*_AARCH64_DLINK_FLAGS = -z common-page-size=0x1000
+
 [BuildOptions.common.EDKII.DXE_RUNTIME_DRIVER]
   GCC:*_*_ARM_DLINK_FLAGS = -z common-page-size=0x1000
   GCC:*_*_AARCH64_DLINK_FLAGS = -z common-page-size=0x10000
@@ -380,6 +383,13 @@ [PcdsFixedAtBuild.common]
 [PcdsFixedAtBuild.ARM]
   gEmbeddedTokenSpaceGuid.PcdPrePiCpuMemorySize|40
 
+[PcdsFixedAtBuild.AARCH64]
+  #
+  # Enable strict image permissions for all images. (This applies
+  # only to images that were built with >= 4 KB section alignment.)
+  #
+  gEfiMdeModulePkgTokenSpaceGuid.PcdImageProtectionPolicy|0x3
+
 [Components.common]
   #
   # Networking stack
-- 
2.7.4