Hi,
I am not a profesional Linux and English user so keep it in mind. I recently 
heard of Wayland and I have some questions about security. Security is one of 
the reason why I am using Linux. I know little about security (but I will be 
learning about hardening system in the future), I know only that today Linux is 
more secure than Windows but in the future there will be more security threats. 
This makes me afraid about security of Linux. I readed some informations about 
Mandatory Access Control and Access Control Lis and Virtualization. I readed 
about Qubes OS too. Joanna Rutkowska  said that in X Server there has not any 
isolation bettwen apps so every application can sniff everything what user 
enter wherever even it is another application. Her opinion is that this is a 
big problem for security. Even Windows have security feature  that keylogger 
can't sniff password entered into User Account Control but in Ubuntu keylogger 
could read passwords entered into gksu. I thing that she knows what is she 
saing because on the site www.invisiblethingslab.com there is hers paper called 
Software Attacks against Intel VT-d technology and other advanced methods of 
attack, she proposed feature in processors called “Supervisor Mode Execution 
Protection” and it is in the Ivy Bridge processors and yesterday I readed about 
that Rafał Wojtczuk (also worked on Qubes OS) discovered a bug in Intel's 
Virtualization in processors. 
Is there ACL in Wayland? If not, it will be hard to implement it by security 
specialists? Is in Wayland focus on security? Is Wayland a secure display 
server? Can I manage windows in Wayland and give them for example untrusted 
status?

If you want read about Qubes OS and GUI isolation:

http://theinvisiblethings.blogspot.com/2011/04/linux-security-circus-on-gui-isolation.html
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