Date: Fri, 9 Feb 2018 07:26:09 +0300 From: "Kirill A. Shutemov" <kirill@...temov.name> To: Matthew Wilcox <willy@...radead.org> Cc: Daniel Micay <danielmicay@...il.com>, Jann Horn <jannh@...gle.com>, linux-mm@...ck.org, Kernel Hardening <kernel-hardening@...ts.openwall.com>, kernel list <linux-kernel@...r.kernel.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> 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 libc.so. -- Kirill A. Shutemov
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