svn commit: r198505 - head/sys/vm
Kostik Belousov
kostikbel at gmail.com
Tue Oct 27 10:19:21 UTC 2009
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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