svn commit: r198505 - head/sys/vm

[Kostik Belousov]

On Tue, Oct 27, 2009 at 10:15:58AM +0000, Konstantin Belousov wrote:
> Author: kib
> Date: Tue Oct 27 10:15:58 2009
> New Revision: 198505
> URL: http://svn.freebsd.org/changeset/base/198505
> 
> Log:
>   When protection of wired read-only mapping is changed to read-write,
of private wired read-only mapping

>   install new shadow object behind the map entry and copy the pages
>   from the underlying objects to it. This makes the mprotect(2) call to
>   actually perform the requested operation instead of silently do nothing
>   and return success, that causes SIGSEGV on later write access to the
>   mapping.
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