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Open Source and information security mailing list archives
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Date: Thu, 7 Jan 2021 16:54:13 -0500 From: Andrea Arcangeli <aarcange@...hat.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Jason Gunthorpe <jgg@...pe.ca>, Linux-MM <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Yu Zhao <yuzhao@...gle.com>, Andy Lutomirski <luto@...nel.org>, Peter Xu <peterx@...hat.com>, Pavel Emelyanov <xemul@...nvz.org>, Mike Kravetz <mike.kravetz@...cle.com>, Mike Rapoport <rppt@...ux.vnet.ibm.com>, Minchan Kim <minchan@...nel.org>, Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Hugh Dickins <hughd@...gle.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Matthew Wilcox <willy@...radead.org>, Oleg Nesterov <oleg@...hat.com>, Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>, John Hubbard <jhubbard@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Jan Kara <jack@...e.cz>, Kirill Tkhai <ktkhai@...tuozzo.com> Subject: Re: [PATCH 0/2] page_count can't be used to decide when wp_page_copy On Thu, Jan 07, 2021 at 12:32:09PM -0800, Linus Torvalds wrote: > I think Andrea is blinded by his own love for UFFDIO: when I do a > debian codesearch for UFFDIO_WRITEPROTECT, all it finds is the kernel > and strace (and the qemu copies of the kernel headers). For the record, I feel obliged to reiterate I'm thinking purely in clear_refs terms here. It'd be great if we can only focus on clear_refs_write and nothing else. Like I said earlier, whatever way clear_refs/softdirty copes with do_wp_page, uffd-wp can do the identical thing so, uffd-wp is effectively irrelevant in this whole discussion. Clear-refs/softdirty predates uffd-wp by several years too. Thanks, Andrea
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