[PATCH v3 1/5] kernel-shark: Show warning message when running as Root

["Yordan Karadzhov (VMware)" <y.karadz@gmail.com>]

Running the KernelShark GUI with Root privileges is not recommended due
to security reasons. The user will be allowed to continue on its own risk.

Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204475
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 kernel-shark/src/KsMainWindow.cpp | 28 ++++++++++++++++++++++++++++
 kernel-shark/src/KsMainWindow.hpp |  2 ++
 2 files changed, 30 insertions(+)

diff --git a/kernel-shark/src/KsMainWindow.cpp b/kernel-shark/src/KsMainWindow.cpp
index 6439265..904d682 100644
--- a/kernel-shark/src/KsMainWindow.cpp
+++ b/kernel-shark/src/KsMainWindow.cpp
@@ -76,6 +76,9 @@ KsMainWindow::KsMainWindow(QWidget *parent)
 	_createMenus();
 	_initCapture();
 
+	if (geteuid() == 0)
+		_rootWarning();
+
 	_splitter.addWidget(&_graph);
 	_splitter.addWidget(&_view);
 	setCentralWidget(&_splitter);
@@ -1271,3 +1274,28 @@ void KsMainWindow::_deselectB()
 	_mState.updateLabels();
 	_graph.glPtr()->model()->update();
 }
+
+void KsMainWindow::_rootWarning()
+{
+	QString cbFlag("noRootWarn");
+
+	if (_settings.value(cbFlag).toBool())
+		return;
+
+	QMessageBox warn;
+	warn.setText("KernelShark is running with Root privileges.");
+	warn.setInformativeText("Continue at your own risk.");
+	warn.setIcon(QMessageBox::Warning);
+	warn.setStandardButtons(QMessageBox::Close);
+
+	QCheckBox cb("Don't show this message again.");
+
+	auto lamCbChec = [&] (int state) {
+		if (state)
+			_settings.setValue(cbFlag, true);
+	};
+
+	connect(&cb, &QCheckBox::stateChanged, lamCbChec);
+	warn.setCheckBox(&cb);
+	warn.exec();
+}
diff --git a/kernel-shark/src/KsMainWindow.hpp b/kernel-shark/src/KsMainWindow.hpp
index 62e66a0..4a7b8ab 100644
--- a/kernel-shark/src/KsMainWindow.hpp
+++ b/kernel-shark/src/KsMainWindow.hpp
@@ -238,6 +238,8 @@ private:
 
 	void _deselectB();
 
+	void _rootWarning();
+
 	void _updateFilterMenu();
 
 	void _filterSyncCBoxUpdate(kshark_context *kshark_ctx);
-- 
2.20.1