Messages in this thread | | | Date | Fri, 28 Apr 2023 15:50:20 -0300 | From | Jason Gunthorpe <> | Subject | Re: [PATCH v5] mm/gup: disallow GUP writing to file-backed mappings by default |
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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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