Re: [patch] mremap.2: Add description of old_size == 0 functionality

From	Florian Weimer <fweimer@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [patch] mremap.2: Add description of old_size == 0 functionality
Date	2017-09-25 17:00 +0200
Message-ID	<utD1v-7Jk-13@gated-at.bofh.it> (permalink)
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On 09/25/2017 04:52 PM, Michal Hocko wrote:
> On Mon 25-09-17 15:16:09, Florian Weimer wrote:
>> On 09/25/2017 02:52 PM, Michal Hocko wrote:
>>> So, how are you going to deal with the CoW and the implementation which
>>> basically means that the newm mmap content is not the same as the
>>> original one?
>>
>> I don't understand why CoW would kick in.
> 
> So you can guarantee nobody is going to write to that memory?

It's mapped readable and executable, but not writable.  So the only 
thing that could interfere would be a debugger.

Thanks,
Florian

Thread

[patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-15 23:40 +0200
  Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-16 00:00 +0200
    Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-18 15:50 +0200
      Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-18 19:20 +0200
        Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-19 14:20 +0200
          [patch v2] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-19 23:50 +0200
            Re: [patch v2] mremap.2: Add description of old_size == 0  functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-20 09:30 +0200
              Re: [patch v2] mremap.2: Add description of old_size == 0  functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 14:40 +0200
                Re: [patch v2] mremap.2: Add description of old_size == 0 functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-25 14:50 +0200
              Re: [patch v2] mremap.2: Add description of old_size == 0  functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-25 18:40 +0200
                Re: [patch v2] mremap.2: Add description of old_size == 0 functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-25 21:30 +0200
          Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 14:40 +0200
            Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 14:50 +0200
              Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 15:00 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 15:20 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 17:00 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 17:00 +0200
  Re: [patch] mremap.2: Add description of old_size == 0 functionality Jann Horn <jannh@google.com> - 2017-09-18 04:00 +0200
    Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-18 19:30 +0200

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