Date: Wed, 21 Feb 2018 14:01:20 +0200 From: Igor Stoppa <igor.stoppa@...wei.com> To: Matthew Wilcox <willy@...radead.org> 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 20/02/18 22:54, Matthew Wilcox wrote: > On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote: [...] >> 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. it seems to return garbage also without this patch, but I need to clean up the code, try it again and possibly come up with a demo patch for triggering the problem. I'll investigate it more. However it doesn't seem to be related to the functionality I need. So I plan to treat it as separate issue and leave find_vm_area untouched, at least in pmalloc scope. -- igor
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