On Tue, Apr 08, 2014 at 09:05:49AM -0400, David Long wrote:
Unfortunately copy_to_user_page() also needs a pointer to a vma struct so, while it presumably provides the model to follow, it can't simply be dropped in.
Well, isn't this code doing the same thing as ptrace? It seems to want to modify a page in userspace of another process to change instructions that are going to be executed. That's what ptrace does, and ptrace already copes with all the issues there.
Given that we've already solved that problem, wouldn't it be a good idea if the tracing code would stop trying to reinvent broken solutions to problems we have already solved?