BaseTools: Fix Section header size larger than elf file size bug

Add the logic to handle the case that Section header size larger than
elf file size.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/C/GenFw/Elf32Convert.c

@@ -674,6 +674,9 @@ WriteSections32 (
       switch (Shdr->sh_type) {
       case SHT_PROGBITS:
         /* Copy.  */
+        if (Shdr->sh_offset + Shdr->sh_size > mFileBufferSize) {
+          return FALSE;
+        }
         memcpy(mCoffFile + mCoffSectionsOffset[Idx],
               (UINT8*)mEhdr + Shdr->sh_offset,
               Shdr->sh_size);

BaseTools/Source/C/GenFw/Elf64Convert.c

@@ -670,6 +670,9 @@ WriteSections64 (
       switch (Shdr->sh_type) {
       case SHT_PROGBITS:
         /* Copy.  */
+        if (Shdr->sh_offset + Shdr->sh_size > mFileBufferSize) {
+          return FALSE;
+        }
         memcpy(mCoffFile + mCoffSectionsOffset[Idx],
               (UINT8*)mEhdr + Shdr->sh_offset,
               (size_t) Shdr->sh_size);

BaseTools/Source/C/GenFw/ElfConvert.c

@@ -1,7 +1,7 @@
 /** @file
 Elf convert solution
 
-Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
 
 This program and the accompanying materials are licensed and made available 
 under the terms and conditions of the BSD License which accompanies this 
@@ -57,6 +57,11 @@ UINT32 mCoffOffset;
 //
 UINT32 mTableOffset;
 
+//
+//mFileBufferSize
+//
+UINT32 mFileBufferSize;
+
 //
 //*****************************************************************************
 // Common ELF Functions
@@ -173,6 +178,7 @@ ConvertElf (
   ELF_FUNCTION_TABLE              ElfFunctions;
   UINT8                           EiClass;
 
+  mFileBufferSize = *FileLength;
   //
   // Determine ELF type and set function table pointer correctly.
   //
@@ -201,9 +207,15 @@ ConvertElf (
   // Write and relocate sections.
   //
   VerboseMsg ("Write and relocate sections.");
-  ElfFunctions.WriteSections (SECTION_TEXT);
+  if (!ElfFunctions.WriteSections (SECTION_TEXT)) {
-  ElfFunctions.WriteSections (SECTION_DATA);
+    return FALSE;
-  ElfFunctions.WriteSections (SECTION_HII);
+  }
+  if (!ElfFunctions.WriteSections (SECTION_DATA)) {
+    return FALSE;
+  }
+  if (!ElfFunctions.WriteSections (SECTION_HII)) {
+    return FALSE;
+  }
 
   //
   // Translate and write relocations.

BaseTools/Source/C/GenFw/ElfConvert.h

@@ -1,7 +1,7 @@
 /** @file
 Header file for Elf convert solution
 
-Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
 
 This program and the accompanying materials are licensed and made available 
 under the terms and conditions of the BSD License which accompanies this 
@@ -29,6 +29,7 @@ extern UINT32 mImageTimeStamp;
 extern UINT8  *mCoffFile;
 extern UINT32 mTableOffset;
 extern UINT32 mOutImageType;
+extern UINT32 mFileBufferSize;
 
 //
 // Common EFI specific data.