ovmf: fix CVE-2024-38796

Backport a fix from upstream to resolve CVE-2024-38796

    tianocore/edk2@c95233b

Signed-off-by: Hongxu Jia <[email protected]>

meta/recipes-core/ovmf/ovmf/0001-MdePkg-Fix-overflow-issue-in-BasePeCoffLib.patch

@@ -0,0 +1,37 @@
+From c4d6af8428375c0343fcfd20bf1465e6d4be4690 Mon Sep 17 00:00:00 2001
+From: Doug Flick <[email protected]>
+Date: Fri, 22 Nov 2024 17:44:27 +0800
+Subject: [PATCH] MdePkg: Fix overflow issue in BasePeCoffLib
+
+The RelocDir->Size is a UINT32 value, and RelocDir->VirtualAddress is
+also a UINT32 value. The current code does not check for overflow when
+adding RelocDir->Size to RelocDir->VirtualAddress. This patch adds a
+check to ensure that the addition does not overflow.
+
+Signed-off-by: Doug Flick <[email protected]>
+Authored-by: sriraamx gobichettipalayam <[email protected]>
+
+CVE: CVE-2024-38796
+Upstream-Status: Backport [https://github.com/tianocore/edk2/commit/c95233b8525ca6828921affd1496146cff262e65]
+
+Signed-off-by: Hongxu Jia <[email protected]>
+---
+ MdePkg/Library/BasePeCoffLib/BasePeCoff.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/MdePkg/Library/BasePeCoffLib/BasePeCoff.c b/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
+index 6d8d9faeb8..2339b111b5 100644
+--- a/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
++++ b/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
+@@ -1014,7 +1014,7 @@ PeCoffLoaderRelocateImage (
+     RelocDir = &Hdr.Te->DataDirectory[0];
+   }
+
+-  if ((RelocDir != NULL) && (RelocDir->Size > 0)) {
++  if ((RelocDir != NULL) && (RelocDir->Size > 0) && (RelocDir->Size - 1 < MAX_UINT32 - RelocDir->VirtualAddress)) {
+     RelocBase    = (EFI_IMAGE_BASE_RELOCATION *)PeCoffLoaderImageAddress (ImageContext, RelocDir->VirtualAddress, TeStrippedOffset);
+     RelocBaseEnd = (EFI_IMAGE_BASE_RELOCATION *)PeCoffLoaderImageAddress (
+                                                   ImageContext,
+-- 
+2.34.1
+

meta/recipes-core/ovmf/ovmf_git.bb

@@ -53,6 +53,7 @@ SRC_URI = "gitsm://github.com/tianocore/edk2.git;branch=master;protocol=https \
            file://CVE-2022-36765-0001.patch \
            file://CVE-2022-36765-0002.patch \
            file://CVE-2022-36765-0003.patch \
+           file://0001-MdePkg-Fix-overflow-issue-in-BasePeCoffLib.patch \
            "
 
 PV = "edk2-stable202202"