It is possible to run my application with root priviliges using sudo
, like this:
sudo ./MyApp
Is it possible to debug my Qt application using root priviliges using QtCreator? How can I do this on an Ubuntu system?
Tools-> Options-> Environment
General
under **System** Group
there is a Terminal
Option./usr/bin/xterm -e
. Replace it with /usr/bin/xterm -e sudo
or /usr/bin/gnome-terminal -x sudo
.Apply
and OK
Buttons.Projects
, select Run
Option. Under Run
Group Box select Run in Terminal
.Remember : sudo
option must be there
Edit /etc/sudoers
using sudo visudo
Next time when you run the program it will be invoked in a new xterm
or gnome-terminal
with Super User Permission and will ask for the root password.
I solved it by starting Qt Creator as root.
sudo /usr/bin/qtcreator
Now It will get the root permission to the application when I compile and debug. Now its possible to debug my application with root privilege.
I would run the program from a terminal with a GDB server (as root) and then connect to the server with gdb from QtCreator. You would start gdbserver with something like this:
$ sudo gdbserver host:2345 ./MyApp
Here, you are hosting the server with port 2345. You can also check if your application is indeed running with UID 0.
$ sudo ps -u
Now, in Qt Creator, go Debug -> Start Debugging -> Attach to Running Debug Server. Fill in the form... the most important is the port and server address. I chose 127.0.0.1 and 2345. You can select break at main to break at the beginning of the program. GDB server doesn't start the program until you connect.
Running that as root is a horrible idea. Instead, use the source, and make qtcreator use sudo to launch gdb like this. Requires that you run qtcreator from a tty and auth sudo before you launch qtcreator, or configure your user for passwordless sudo (not recommended). I'll code a more complete solution later.
It took me to 1-2 hours code/debug with no prior knowledge of QT. Most that time was spent waiting for the compilation to complete
https://gist.github.com/ppetraki/a0080da047047ea184c6
--- qtcreator-3.0.1.orig/src/plugins/debugger/gdb/gdbprocess.cpp
+++ qtcreator-3.0.1/src/plugins/debugger/gdb/gdbprocess.cpp
@@ -59,7 +59,11 @@ QByteArray GdbProcess::readAllStandardEr
void GdbProcess::start(const QString &cmd, const QStringList &args) { - m_gdbProc.setCommand(cmd, Utils::QtcProcess::joinArgs(args)); + QStringList sudoArgs; + sudoArgs << cmd << args; + QString sudoCmd = QString::fromUtf8("/usr/bin/sudo"); + + m_gdbProc.setCommand(sudoCmd, Utils::QtcProcess::joinArgs(sudoArgs)); m_gdbProc.start(); }
The following actions were recommended on Qt support forum:
In Qt Creator, add remote Linux device in Options -> Devices. Set its address as localhost and user as root. Create a pair of authentication keys and paste public key to /root/.ssh/authorized_keys
.
Then clone Desktop kit in Options -> Kits and set the device for new kit to the device you've created on previous step.
Now, when you start debugging, Qt Creator should automatically connect over ssh to localhost as root, start gdbserver and perform debugging.
It works for running without debugging too.
Perhaps you should set up installation of your program on remote host, but that's a different story and it's done differently for Qmake and QBS.
One easy way is to run the project in a terminal check Run as a Root user
.
Here is Screenshot to show steps: