Date: Tue, 20 Feb 2018 12:54:42 -0800 From: Matthew Wilcox <willy@...radead.org> To: Igor Stoppa <igor.stoppa@...wei.com> Cc: rdunlap@...radead.org, corbet@....net, keescook@...omium.org, mhocko@...nel.org, labbott@...hat.com, jglisse@...hat.com, hch@...radead.org, cl@...ux.com, linux-security-module@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH 3/6] struct page: add field for vm_struct On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote: > The patch relies on the function vmalloc_to_page ... which will return > NULL when applied to huge mappings, while the original implementation > will still work. Huh? vmalloc_to_page() should work for huge mappings... > It was found while testing on a configuration with framebuffer. ... ah. You tried to use vmalloc_to_page() on something which wasn't backed by a struct page. That's *supposed* to return NULL, but my guess is that after this patch it returned garbage.
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