Re: [TRIVIAL] Warn users about machines with non-working WP bit

David S. Miller
2002-08-06T14:06:02Z

From: Kasper Dupont <kasperd@daimi.au.dk>
Date: Tue, 06 Aug 2002 16:03:34 +0200

"David S. Miller" wrote:
> verify_area() checks aren't enough, consider a threaded application
> calling mprotect() while the copy is in progress.

Couldn't we just freeze all other processes with the same mm while
a copy_to_user is in progress?

What if we have to sleep and page in some memory from disk?

Your idea could lead to deadlock in a multi-threaded app.