From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jan Kara <jack@suse.cz>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>,
Matthew Wilcox <willy@infradead.org>,
Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>,
Leon Romanovsky <leon@kernel.org>,
Christian Benvenuti <benve@cisco.com>,
Nelson Escobar <neescoba@cisco.com>,
Bernard Metzler <bmt@zurich.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Bjorn Topel <bjorn@kernel.org>,
Magnus Karlsson <magnus.karlsson@intel.com>,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
Jonathan Lemon <jonathan.lemon@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Christian Brauner <brauner@kernel.org>,
Richard Cochran <richardcochran@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
linux-fsdevel@vger.kernel.org, linux-perf-users@vger.kernel.org,
netdev@vger.kernel.org, bpf@vger.kernel.org,
John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH] mm/gup: disallow GUP writing to file-backed mappings by default
Date: Mon, 24 Apr 2023 14:53:00 -0300 [thread overview]
Message-ID: <ZEbB/LGw8UoSKJiX@ziepe.ca> (raw)
In-Reply-To: <20230424160952.bvii2ahgxss2chev@quack3>
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
prev parent reply other threads:[~2023-04-24 17:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-22 13:37 [PATCH] mm/gup: disallow GUP writing to file-backed mappings by default Lorenzo Stoakes
2023-04-23 19:32 ` Simon Horman
2023-04-23 19:40 ` Lorenzo Stoakes
2023-04-23 20:02 ` Simon Horman
2023-04-23 22:29 ` Dave Chinner
2023-04-23 22:56 ` Lorenzo Stoakes
2023-04-24 17:49 ` Jason Gunthorpe
2023-04-24 3:41 ` Mika Penttilä
2023-04-24 6:51 ` Lorenzo Stoakes
2023-04-24 12:02 ` Kirill A. Shutemov
2023-04-24 12:31 ` Lorenzo Stoakes
2023-04-24 13:40 ` Kirill A. Shutemov
2023-04-24 17:59 ` Jason Gunthorpe
2023-04-24 16:09 ` Jan Kara
2023-04-24 16:22 ` Lorenzo Stoakes
2023-04-24 17:53 ` Jason Gunthorpe [this message]
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