Merge branch 'GP-1104_ghizard_Fix_PDB_CLI_processing_bug' into patch

Author: ghidra1

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/PdbApplicator.java

@@ -439,6 +439,23 @@ void pdbLogAndInfoMessage(Object originator, String message) {
 		Msg.info(originator, message);
 	}
 
+	/**
+	 * Puts error message to {@link PdbLog} and to Msg.error() which will 
+	 * also log a stack trace if exception is specified.
+	 * @param originator a Logger instance, "this", or YourClass.class
+	 * @param message the error message to display/log
+	 * @param exc exception whose stack trace should be reported or null
+	 */
+	void pdbLogAndErrorMessage(Object originator, String message, Exception exc) {
+		PdbLog.message(message);
+		if (exc != null) {
+			Msg.error(originator, message);
+		}
+		else {
+			Msg.error(originator, message, exc);
+		}
+	}
+
 	/**
 	 * Returns the {@link TaskMonitor} to available for this analyzer.
 	 * @return the monitor.
@@ -928,6 +945,7 @@ void addMemorySectionRefinement(PeCoffSectionMsSymbol symbol) {
 	//==============================================================================================
 	// CLI-Managed infor methods.
 	//==============================================================================================
+
 	// Currently in CLI, but could move.
 	boolean isDll() {
 		return pdbCliManagedInfoManager.isDll();
@@ -938,6 +956,15 @@ boolean isAslr() {
 		return pdbCliManagedInfoManager.isAslr();
 	}
 
+	/**
+	 * Get CLI metadata for specified tableNum and rowNum within the CLI
+	 * metadata stream.
+	 * @param tableNum CLI metadata stream table index
+	 * @param rowNum table row number
+	 * @return CLI metadata or null if specified tableNum not found
+	 * @throws PdbException if CLI metadata stream is not found in program file bytes
+	 * @throws IndexOutOfBoundsException if specified rowNum is invalid
+	 */
 	CliAbstractTableRow getCliTableRow(int tableNum, int rowNum) throws PdbException {
 		return pdbCliManagedInfoManager.getCliTableRow(tableNum, rowNum);
 	}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/PdbCliInfoManager.java

@@ -37,6 +37,9 @@
  */
 public class PdbCliInfoManager {
 
+	private PdbApplicator applicator;
+
+	private boolean initComplete = false;
 	private CliStreamMetadata metadataStream;
 
 	// TODO: May move these out from this class to a higher level.  Would mean passing in
@@ -46,22 +49,43 @@ public class PdbCliInfoManager {
 
 	/**
 	 * Manager of CLI-related tables that we might need access to for PDB processing.
-	 * @param applicator {@link PdbApplicator} for which this class is working.
+	 * @param applicator {@link PdbApplicator} for which this class is working (used for logging purposes only).
 	 */
 	PdbCliInfoManager(PdbApplicator applicator) {
 		Objects.requireNonNull(applicator, "applicator may not be null");
-		metadataStream = getCliStreamMetadata(applicator);
+		this.applicator = applicator;
+	}
+
+	private synchronized void initialize() {
+		if (initComplete) {
+			return;
+		}
+		initComplete = true;
+		metadataStream = getCliStreamMetadata();
 	}
 
 	boolean isDll() {
+		initialize();
 		return isDll;
 	}
 
 	boolean isAslr() {
+		initialize();
 		return isAslr;
 	}
 
-	CliAbstractTableRow getCliTableRow(int tableNum, int rowNum) throws PdbException {
+	/**
+	 * Get CLI metadata for specified tableNum and rowNum within the CLI
+	 * metadata stream.
+	 * @param tableNum CLI metadata stream table index
+	 * @param rowNum table row number
+	 * @return CLI metadata or null if specified tableNum not found
+	 * @throws PdbException if CLI metadata stream is not found in program file bytes
+	 * @throws IndexOutOfBoundsException if specified rowNum is invalid
+	 */
+	CliAbstractTableRow getCliTableRow(int tableNum, int rowNum)
+			throws PdbException, IndexOutOfBoundsException {
+		initialize();
 		if (metadataStream == null) {
 			throw new PdbException("CliStreamMetadata is null");
 		}
@@ -72,47 +96,67 @@ CliAbstractTableRow getCliTableRow(int tableNum, int rowNum) throws PdbException
 		return table.getRow(rowNum);
 	}
 
-	private CliStreamMetadata getCliStreamMetadata(PdbApplicator applicator) {
+	/**
+	 * Get CLI stream metadata
+	 * @return CLI stream metadata or null if not found or error occured
+	 */
+	private CliStreamMetadata getCliStreamMetadata() {
 		Program program = applicator.getProgram();
 		if (program == null) {
 			return null;
 		}
 
 		List<FileBytes> allFileBytes = program.getMemory().getAllFileBytes();
+		if (allFileBytes.isEmpty()) {
+			applicator.pdbLogAndErrorMessage(this,
+				"Unable to retrieve CliStreamMetadata: no FileBytes", null);
+			return null;
+		}
 		FileBytes fileBytes = allFileBytes.get(0); // Should be that of main imported file
-		ByteProvider provider = new FileBytesProvider(fileBytes);
-		PortableExecutable pe = null;
+		ByteProvider provider = new FileBytesProvider(fileBytes); // close not required
 		try {
 			GenericFactory factory = MessageLogContinuesFactory.create(applicator.getMessageLog());
-			pe = PortableExecutable.createPortableExecutable(factory, provider, SectionLayout.FILE,
-				true, true);
-			NTHeader ntHeader = pe.getNTHeader();
+			PortableExecutable pe = PortableExecutable.createPortableExecutable(factory, provider,
+				SectionLayout.FILE, true, true);
+			NTHeader ntHeader = pe.getNTHeader(); // will be null if header parse fails
+			if (ntHeader == null) {
+				applicator.pdbLogAndErrorMessage(this,
+					"Unable to retrieve CliStreamMetadata: NTHeader file bytes not found", null);
+				return null;
+			}
 			OptionalHeader optionalHeader = ntHeader.getOptionalHeader();
 			int characteristics = ntHeader.getFileHeader().getCharacteristics();
 			isDll = (characteristics & FileHeader.IMAGE_FILE_DLL) == FileHeader.IMAGE_FILE_DLL;
 			DataDirectory[] dataDirectory = optionalHeader.getDataDirectories();
 			int optionalHeaderCharaceristics = optionalHeader.getDllCharacteristics();
 			isAslr = (optionalHeaderCharaceristics &
 				OptionalHeader.IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA) == OptionalHeader.IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA;
+			if (OptionalHeader.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR >= dataDirectory.length) {
+				applicator.pdbLogAndErrorMessage(this,
+					"Unable to retrieve CliStreamMetadata: Bad index (" +
+						OptionalHeader.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR +
+						") for COMDescriptorDataDirectory in DataDirectory array of size " +
+						dataDirectory.length,
+					null);
+				return null;
+			}
 			COMDescriptorDataDirectory comDir =
 				(COMDescriptorDataDirectory) dataDirectory[OptionalHeader.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR];
 			ImageCor20Header header = comDir.getHeader();
 			if (header == null) {
+				applicator.pdbLogAndErrorMessage(this,
+					"Unable to retrieve CliStreamMetadata: no COMDir header", null);
 				return null;
 			}
 			return header.getMetadata().getMetadataRoot().getMetadataStream();
 		}
-		catch (Exception e) {
-			applicator.pdbLogAndInfoMessage(this, "Unable to retrieve CliStreamMetadata");
+		catch (RuntimeException | IOException e) {
+			// We do not know what can go wrong.  Some of the header parsing might have issues,
+			// and we'd rather log the error and limp on by with whatever other processing we can
+			// do than to fail here.
+			applicator.pdbLogAndErrorMessage(this,
+				"Unable to retrieve CliStreamMetadata: " + e.getMessage(), e);
 			return null;
 		}
-		finally {
-			try {
-				provider.close();
-			}
-			catch (IOException ioe) {
-				applicator.pdbLogAndInfoMessage(this, "Problem closing ByteProvider");
-			}
-		}
 	}
 }