Re: Privilege Levels Below User

John Savard wrote:

On Sun, 9 Jun 2024 22:48:28 -0000 (UTC), Lawrence D'Oliveiro
<ldo@nz.invalid> wrote:

And just as a further nitpick (if the above weren’t enough), what
happens
 if the “file” your C compiler is writing to is in a RAM disk?

Well, the output could be stored with no problem, because while it's
on the RAM disk, it can't be executed. It has to be copied from the
RAM disk, into memory that's not pretending to be a disk, by the
loader. So this case doesn't change anything from the case of a real
disk.

One can create a PTE pointing at that RAM disk page and then allow
someone to execute it directly.
OR
One can copy it somewhere that has execute permission in a single
instruction (MM = memory to memory move)
Neither is any real burden to enabling execute.

John Savard