[edk2-devel] [PATCH v2 1/3] MdeModulePkg: ImagePropertiesRecordLib: Use SectionAlignment for CodeSize

["Oliver Smith-Denny" <osde@linux.microsoft.com>]

When an ImageRecord is stored by ImagePropertiesRecordLib, it reports the
CodeSegmentSize as the SizeOfRawData from the image. However, the image
as loaded into memory is aligned to the SectionAlignment, so
SizeOfRawData is under the actual size in memory. This is important,
because the memory attributes table uses these image records to create
its entries and it will report that the alignment of an image is
incorrect, even though the actual image is correct.

This was discovered on ARM64, which has a 64k runtime page granularity
alignment, which is backed by a 64k section alignment for
DXE_RUNTIME_DRIVERs. The runtime code and data was correctly being
loaded into memory, however the memory attribute table was incorrectly
reporting misaligned ranges to the OS, causing attributes to be
ignored for these sections for OSes using greater than 4k pages.

This patch correctly aligns the CodeSegmentSize to the SectionAlignment
and the corresponding memory attribute table entries are now correctly
aligned and pointing to the right places in memory.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Taylor Beebe <taylor.d.beebe@gmail.com>

Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
---
 MdeModulePkg/Library/ImagePropertiesRecordLib/ImagePropertiesRecordLib.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Library/ImagePropertiesRecordLib/ImagePropertiesRecordLib.c b/MdeModulePkg/Library/ImagePropertiesRecordLib/ImagePropertiesRecordLib.c
index e53ce086c54c..763a8d65d565 100644
--- a/MdeModulePkg/Library/ImagePropertiesRecordLib/ImagePropertiesRecordLib.c
+++ b/MdeModulePkg/Library/ImagePropertiesRecordLib/ImagePropertiesRecordLib.c
@@ -1090,7 +1090,9 @@ CreateImagePropertiesRecord (
       ImageRecordCodeSection->Signature = IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE;
 
       ImageRecordCodeSection->CodeSegmentBase = (UINTN)ImageBase + Section[Index].VirtualAddress;
-      ImageRecordCodeSection->CodeSegmentSize = Section[Index].SizeOfRawData;
+      // We still need to align the VirtualSize to the SectionAlignment because MSVC does not do
+      // this when creating a PE image. It expects the loader to do this.
+      ImageRecordCodeSection->CodeSegmentSize = ALIGN_VALUE (Section[Index].Misc.VirtualSize, SectionAlignment);
 
       InsertTailList (&ImageRecord->CodeSegmentList, &ImageRecordCodeSection->Link);
       ImageRecord->CodeSegmentCount++;
-- 
2.40.1



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