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Message-ID: <ZEbB/LGw8UoSKJiX@ziepe.ca> Date: Mon, 24 Apr 2023 14:53:00 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Jan Kara <jack@...e.cz> Cc: Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Jens Axboe <axboe@...nel.dk>, Matthew Wilcox <willy@...radead.org>, Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>, Leon Romanovsky <leon@...nel.org>, Christian Benvenuti <benve@...co.com>, Nelson Escobar <neescoba@...co.com>, Bernard Metzler <bmt@...ich.ibm.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, Bjorn Topel <bjorn@...nel.org>, Magnus Karlsson <magnus.karlsson@...el.com>, Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Jonathan Lemon <jonathan.lemon@...il.com>, "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Christian Brauner <brauner@...nel.org>, Richard Cochran <richardcochran@...il.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, linux-fsdevel@...r.kernel.org, linux-perf-users@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org, John Hubbard <jhubbard@...dia.com> Subject: Re: [PATCH] mm/gup: disallow GUP writing to file-backed mappings by default On Mon, Apr 24, 2023 at 06:09:52PM +0200, Jan Kara wrote: > So I'm maybe missing a bigger picture why we would like a change like this. > Because we still need to teach filesystems to handle pinned pages for the > usecases you don't forbid and for which we know there are users and then > what's the benefit of this patch? It immediately closes a security hole we have been talking about fixing for years already and still don't have a full fix for. An acknowledgment that this is not going to go away and starting to clamp down on the insecurity may motivate some investment in the proper fix. :) Jason
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