Re: Privilege Levels Below User

On Mon, 10 Jun 2024 17:11:47 -0600, John Savard wrote:

Write can be enabled to memory. Only enabling write and execute together
is potentially subject to restricions.

I was going to say, it might be acceptable in current programming
environments to keep the two states (writable versus executable) carefully
separated, with an explicit transition from one to the other.

But it turns out this isn’t always enough. I wrote some C code taking
advantage of the GCC extension that lets you define nested routines, and
in that situation it creates “thunks” to allow inner routines to access
local variables in outer routines, and that requires an executable stack.