Re: activate my application while dragging on other application window
Re: activate my application while dragging on other application window
- Subject: Re: activate my application while dragging on other application window
- From: Jens Alfke <email@hidden>
- Date: Fri, 4 Apr 2008 09:24:06 -0700
On 3 Apr '08, at 11:03 PM, Apparao Mulpuri wrote:
What type of Security issues are there in Windows appearance
attributes change?
Jens, Could you please explain your reply clearly?
A window's pixels are accessible only to the process that owns the
window, and to the window-server process (which is responsible for
copying them to the screen.) If other processes could write into them,
which is what your feature would require, then
(a) a buggy process could write garbage into other applications'
windows, messing up the entire screen;
(b) a malicious process could write fake content into other
applications' windows. For example, hiding a system security alert by
clearing it to transparent. Even reading the pixels could be a
security problem if there were confidential data in the other app's
window.
You haven't even explained _why_ your app would need such a feature,
or what it's for in the first place. What's the use of an app that
draws squares on my screen and changes other apps' windows colors when
they move into them?
—Jens
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