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Code Issues Releases Wiki Activity

GP-0: Fixed timeout issue in GDB connector

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This commit is contained in:
Dan 2022-02-01 11:08:38 -05:00
parent c395c3d7ca
commit 50fae841b8
1 changed files with 14 additions and 7 deletions
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21
Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/GdbManagerImpl.java
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@ -72,6 +72,7 @@ import sun.misc.SignalHandler;
* event is processed using a {@link HandlerMap}.
*/
public class GdbManagerImpl implements GdbManager {
private static final int TIMEOUT_SEC = 10;
private static final String GDB_IS_TERMINATING = "GDB is terminating";
public static final int MAX_CMD_LEN = 4094; // Account for longest possible line end
@ -126,7 +127,7 @@ public class GdbManagerImpl implements GdbManager {
}
try {
String line;
while (isAlive() && null != (line = reader.readLine())) {
while (GdbManagerImpl.this.isAlive() && null != (line = reader.readLine())) {
String l = line;
if (interpreter == null) {
if (l.startsWith("=") || l.startsWith("~")) {
@ -624,6 +625,16 @@ public class GdbManagerImpl implements GdbManager {
this.newLine = newLine;
}
protected void waitCheckExit(CompletableFuture<?> future)
throws InterruptedException, ExecutionException, TimeoutException, IOException {
CompletableFuture.anyOf(future, state.waitValue(GdbState.EXIT))
.get(TIMEOUT_SEC, TimeUnit.SECONDS);
if (state.get() == GdbState.EXIT) {
throw new IOException(
"GDB terminated early or could not be executed. Check your command line.");
}
}
@Override
public void start(String gdbCmd, String... args) throws IOException {
List<String> fullargs = new ArrayList<>();
@ -642,16 +653,12 @@ public class GdbManagerImpl implements GdbManager {
iniThread.start();
try {
CompletableFuture.anyOf(iniThread.hasWriter, state.waitValue(GdbState.EXIT))
.get(10, TimeUnit.SECONDS);
waitCheckExit(iniThread.hasWriter);
}
catch (InterruptedException | ExecutionException | TimeoutException e) {
throw new IOException(
"Could not detect GDB's interpreter mode. Try " + gdbCmd + " -i mi2");
}
if (state.get() == GdbState.EXIT) {
throw new IOException("GDB terminated before first prompt");
}
switch (iniThread.interpreter) {
case CLI:
Pty mi2Pty = ptyFactory.openpty();
@ -678,7 +685,7 @@ public class GdbManagerImpl implements GdbManager {
mi2Thread.setName("GDB Read MI2");
mi2Thread.start();
try {
mi2Thread.hasWriter.get(10, TimeUnit.SECONDS);
waitCheckExit(mi2Thread.hasWriter);
}
catch (InterruptedException | ExecutionException | TimeoutException e) {
throw new IOException(