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Message-ID: <ZEwVbPM2OPSeY21R@nvidia.com>
Date: Fri, 28 Apr 2023 15:50:20 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Theodore Ts'o <tytso@....edu>
Cc: David Hildenbrand <david@...hat.com>,
Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
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Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v5] mm/gup: disallow GUP writing to file-backed mappings
by default
On Fri, Apr 28, 2023 at 02:25:53PM -0400, Theodore Ts'o wrote:
> 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?
Jens? You blocked it from io_uring, did you have a specific attack in
mind?
Jason
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