Re: [PATCH gnumach v2] Implement per task virtual memory limit

[Samuel Thibault]

Sergey Bugaev, le mar. 31 déc. 2024 07:41:14 +0300, a ecrit:
> On Tue, Dec 31, 2024 at 1:30 AM Diego Nieto Cid <dnietoc@gmail.com> wrote:
> > On Mon, Dec 30, 2024 at 07:08:55PM +0100, Samuel Thibault wrote:
> > > You also need to take into account the case where
> > > current->max_protection was NONE and new_prot is not NONE, you then have
> > > to decrease size_none.
> > Ah right, the & in the expression tricked me into believing that 
> > max_protection could
> > not be raised.
> 
> Huh? That's my understanding as well. max_protection can never be
> raised; if max_protection was VM_PROT_NONE and the one we're
> attempting to set isn't, we'll fail with KERN_PROTECTION_FAILURE here,
> no?

Ah, yes, so the case is not supposed to exist indeed.

Samuel