From: "Theodore Ts'o" <tytso@mit.edu>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>,
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,
Oleg Nesterov <oleg@redhat.com>,
John Hubbard <jhubbard@nvidia.com>, Jan Kara <jack@suse.cz>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Pavel Begunkov <asml.silence@gmail.com>,
Mika Penttila <mpenttil@redhat.com>,
David Howells <dhowells@redhat.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v5] mm/gup: disallow GUP writing to file-backed mappings by default
Date: Fri, 28 Apr 2023 14:25:53 -0400 [thread overview]
Message-ID: <ZEwPscQu68kx32zF@mit.edu> (raw)
In-Reply-To: <ZEvZtIb2EDb/WudP@nvidia.com>
On Fri, Apr 28, 2023 at 11:35:32AM -0300, Jason Gunthorpe wrote:
>
> It has been years now, I think we need to admit a fix is still years
> away. Blocking the security problem may even motivate more people to
> work on a fix.
Do we think we can still trigger a kernel crash, or maybe even some
more exciting like an arbitrary buffer overrun, via the
process_vm_writev(2) system call into a file-backed mmap'ed region?
Maybe if someone can come up with an easy-to-expliot security proof of
aconcept, that doesn't require special RDMA hardware or some special
libvirt setup, we could finally get motivation to get it fixed, or at
least blocked? :-)
We've only been talking about it for years, after all...
- Ted
> Security is the primary case where we have historically closed uAPI
> items.
>
> Jason
next prev parent reply other threads:[~2023-04-28 18:27 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-27 23:42 Lorenzo Stoakes
2023-04-28 2:06 ` John Hubbard
2023-04-28 4:21 ` Mika Penttilä
2023-04-28 11:51 ` Jan Kara
2023-04-28 11:59 ` Lorenzo Stoakes
2023-04-28 13:17 ` Jason Gunthorpe
2023-04-28 14:20 ` David Hildenbrand
2023-04-28 14:35 ` Jason Gunthorpe
2023-04-28 15:08 ` David Hildenbrand
2023-04-28 15:23 ` David Hildenbrand
2023-04-28 15:33 ` Lorenzo Stoakes
2023-04-28 15:34 ` David Hildenbrand
2023-04-28 15:43 ` David Hildenbrand
2023-04-28 16:09 ` Kirill A . Shutemov
2023-04-28 16:13 ` David Hildenbrand
2023-04-28 16:22 ` Kirill A . Shutemov
2023-04-28 16:39 ` Peter Xu
2023-04-28 16:51 ` David Hildenbrand
2023-04-28 16:56 ` Kirill A . Shutemov
2023-04-28 17:01 ` Lorenzo Stoakes
2023-04-28 17:02 ` David Hildenbrand
2023-04-28 17:31 ` Jason Gunthorpe
2023-04-28 17:42 ` Lorenzo Stoakes
2023-04-28 17:49 ` Jason Gunthorpe
2023-04-28 23:43 ` Kirill A . Shutemov
2023-05-02 8:00 ` Jan Kara
2023-05-02 8:39 ` Peter Zijlstra
2023-04-28 17:01 ` Lorenzo Stoakes
2023-04-28 17:05 ` David Hildenbrand
2023-04-28 17:13 ` Lorenzo Stoakes
2023-04-28 17:29 ` David Hildenbrand
2023-04-28 18:26 ` John Hubbard
2023-04-28 15:56 ` Peter Xu
2023-04-28 16:02 ` David Hildenbrand
2023-04-28 17:33 ` Jason Gunthorpe
2023-04-28 18:26 ` John Hubbard
2023-04-28 15:27 ` Jason Gunthorpe
2023-04-28 15:41 ` David Hildenbrand
2023-04-28 18:25 ` Theodore Ts'o [this message]
2023-04-28 18:50 ` Jason Gunthorpe
2023-04-29 4:21 ` Theodore Ts'o
2023-04-29 23:01 ` Jason Gunthorpe
2023-04-29 23:09 ` Lorenzo Stoakes
2023-05-01 7:27 ` Dave Chinner
2023-05-01 12:39 ` Jason Gunthorpe
2023-04-28 14:55 ` Lorenzo Stoakes
2023-04-28 15:13 ` David Hildenbrand
2023-04-28 15:15 ` Jens Axboe
2023-04-28 15:27 ` Lorenzo Stoakes
2023-04-28 15:24 ` Lorenzo Stoakes
2023-04-28 15:33 ` David Hildenbrand
2023-04-28 15:50 ` Lorenzo Stoakes
2023-04-28 16:00 ` David Hildenbrand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZEwPscQu68kx32zF@mit.edu \
--to=tytso@mit.edu \
--cc=acme@kernel.org \
--cc=adrian.hunter@intel.com \
--cc=akpm@linux-foundation.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=asml.silence@gmail.com \
--cc=ast@kernel.org \
--cc=axboe@kernel.dk \
--cc=benve@cisco.com \
--cc=bjorn@kernel.org \
--cc=bmt@zurich.ibm.com \
--cc=bpf@vger.kernel.org \
--cc=brauner@kernel.org \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=david@redhat.com \
--cc=dennis.dalessandro@cornelisnetworks.com \
--cc=dhowells@redhat.com \
--cc=edumazet@google.com \
--cc=hawk@kernel.org \
--cc=hch@lst.de \
--cc=irogers@google.com \
--cc=jack@suse.cz \
--cc=jgg@nvidia.com \
--cc=jhubbard@nvidia.com \
--cc=john.fastabend@gmail.com \
--cc=jolsa@kernel.org \
--cc=jonathan.lemon@gmail.com \
--cc=kirill@shutemov.name \
--cc=kuba@kernel.org \
--cc=leon@kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=lstoakes@gmail.com \
--cc=maciej.fijalkowski@intel.com \
--cc=magnus.karlsson@intel.com \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=mpenttil@redhat.com \
--cc=namhyung@kernel.org \
--cc=neescoba@cisco.com \
--cc=netdev@vger.kernel.org \
--cc=oleg@redhat.com \
--cc=pabeni@redhat.com \
--cc=peterz@infradead.org \
--cc=richardcochran@gmail.com \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox