27 Nov
2017
27 Nov
'17
10:50 p.m.
On Mon, Nov 27, 2017 at 11:11:41AM -0500, Noel Chiappa wrote:
Isn't that how dtrace works?
From: Doug
McIlroy
But if that had been in D space, it couldn't
have been executed.
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.
Programs which emit these little 'custom code fragments' (I prefer that term,
since they aren't really 'self-modifying code' - which I define as 'a
program
which _changes_ _existing_ instructions) must have some way of having a chunk
of memory into which they can write, but which can also be executed.