29 Nov
2017
29 Nov
'17
1:45 a.m.
On 27 Nov 2017, at 16:11, Noel Chiappa <jnc(a)mercury.lcs.mit.edu> wrote:
Along those lines, I was wondering about modern OS's, which I gather for
security reasons prevent execution of data, and prevent writing to code.
They do by default, at least, in that modern linkers create executable
images where the executable program segments are read-only and
read/write segments (including the stack) are not executable. But
modern OSes have system services for changing page protection, so an
application such as an interpreter or JIT can compose code and then
change the page protection to make it executable.
-Paul W.