[edk2-devel] [RFC 11/13] ArmVirtPkg/ArmVirtQemu: Use read-only memory region type for code flash

[Ard Biesheuvel]

Map the code flash with read-only attributes so we can execute from it
even under a memory protection regime that enables WXN, making all
writable memory regions non-executable by default.

Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
 ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c b/ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c
index aa083cec2082..a5324b1e4eed 100644
--- a/ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c
+++ b/ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c
@@ -115,7 +115,7 @@ ArmVirtGetMemoryMap (
   VirtualMemoryTable[2].PhysicalBase = PcdGet64 (PcdFvBaseAddress);
   VirtualMemoryTable[2].VirtualBase  = VirtualMemoryTable[2].PhysicalBase;
   VirtualMemoryTable[2].Length       = FixedPcdGet32 (PcdFvSize);
-  VirtualMemoryTable[2].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
+  VirtualMemoryTable[2].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_RO;
 
   // End of Table
   ZeroMem (&VirtualMemoryTable[3], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
-- 
2.39.1



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