[Qt-qml] QML/QDeclarativeView and writable-executable memory

[Pertti Kellomäki]

When looking at the memory usage of QML applications from /proc on Linux 
(Ubuntu 10.10), I noticed that there is a 16kb segment of memory which 
is both writable and executable. There are a couple of others, but they 
seem to be related to my nvidia drivers.

This is a tad worrying, as writable and executable memory is a potential 
security hole. Can someone explain what this memory segment is for? Is 
it e.g. related to a jit?

This is what the segment looks like in /proc:

b34fd000-b3501000 rwxp 00000000 00:00 0
Size:                 16 kB
Rss:                   4 kB
Pss:                   4 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         4 kB
Referenced:            4 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB

Thanks in advance!
-- 
Pertti