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I have been wondering for a while about the implications with
Nativeboost for a misbehaving C-library to corrupt the Smalltalk
image. Just now I came across
<a class="moz-txt-link-freetext" href="http://stackoverflow.com/questions/9056427/kernel-mode-and-memory-protection">http://stackoverflow.com/questions/9056427/kernel-mode-and-memory-protection</a>,
where I read:<br>
<br>
"<span
style="color: rgb(0, 0, 0); font-family: Arial,'Liberation Sans','DejaVu Sans',sans-serif; font-size: 13.6px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 17.6px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); display: inline ! important; float: none;">Each
process has its own page table, and each page in the page table can be
restricted by setting a maximum CPL (Current Privilege Level). </span><span
style="color: rgb(0, 0, 0); font-family: Arial,'Liberation Sans','DejaVu Sans',sans-serif; font-size: 13.6px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 17.6px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); display: inline ! important; float: none;">Changing
your CPL is a relatively fast operation"<br>
<br>
I don't know much about this but I am curious... Could the VM be made
to normally run at CPL 2 and when allocating calling out to foreign
function switch to CPL 3 - without too much overhead?<br>
<br>
cheers -ben<br>
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