Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 9 Feb 2018 07:26:09 +0300
From: "Kirill A. Shutemov" <>
To: Matthew Wilcox <>
Cc: Daniel Micay <>, Jann Horn <>,,
	Kernel Hardening <>,
	kernel list <>,
	"Kirill A. Shutemov" <>
Subject: Re: [RFC] Limit mappings to ten per page per process

On Thu, Feb 08, 2018 at 01:37:43PM -0800, Matthew Wilcox wrote:
> On Thu, Feb 08, 2018 at 12:21:00PM -0800, Matthew Wilcox wrote:
> > Now that I think about it, though, perhaps the simplest solution is not
> > to worry about checking whether _mapcount has saturated, and instead when
> > adding a new mmap, check whether this task already has it mapped 10 times.
> > If so, refuse the mapping.
> That turns out to be quite easy.  Comments on this approach?

This *may* break some remap_file_pages() users.

And it may be rather costly for popular binaries. Consider

 Kirill A. Shutemov

Powered by blists - more mailing lists

Your e-mail address:

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.