Messages in this thread | | | From | Florian Weimer <> | Subject | Re: [PATCH v2] mm: Add MREMAP_DONTUNMAP to mremap(). | Date | Thu, 30 Jan 2020 13:19:39 +0100 |
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* Brian Geffon:
> Hi Florian, > copy_vma will make a copy of the existing VMA leaving the old VMA > unchanged, so the source keeps its existing protections, this is what > makes it very useful along with userfaultfd.
I see. On the other hand, it's impossible to get the PROT_NONE behavior by a subsequent mprotect call because the mremap has to fail in some cases in vm.overcommit_memory=2 mode. But maybe that other behavior can be provided with a different flag if it turns out to be useful in the future.
Thanks, Florian
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