Re: Race between vmtruncate and mapped areas?

Rik van Riel
2003-05-14T19:11:53Z

On Wed, 14 May 2003, Dave McCracken wrote:
> --On Wednesday, May 14, 2003 15:04:55 -0400 Rik van Riel <riel@redhat.com>
> wrote:
>
> >> Not to mention they could end up being outside of any VMA,
> >> meaning there's no sane way to deal with them.
> >
> > I hate to follow up to my own email, but the fact that
> > they're not in any VMA could mean we leak these pages
> > at exit() time.
>
> Well, they are still inside the vma. Truncate doesn't shrink the vma. It
> just generates SIGBUS when the app tries to fault the pages in.

Right, I forgot about that. Forget the memory leak and
security bug theory, then ;)))