Date: Sun, 29 Jun 2008 17:01:59 GMT From: das@FreeBSD.org To: koie@suri.co.jp, das@FreeBSD.org, freebsd-bugs@FreeBSD.org Subject: Re: kern/68765: [mmap] a little data can be stored beyond EOF. Message-ID: <200806291701.m5TH1xec066699@freefall.freebsd.org>
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Synopsis: [mmap] a little data can be stored beyond EOF.
State-Changed-From-To: open->closed
State-Changed-By: das
State-Changed-When: Sun Jun 29 16:59:31 UTC 2008
State-Changed-Why:
This is not a bug; it is documented behavior, and other systems behave
the same way. From the first paragraph of mmap(3):
If len is not a multiple of the page-
size, the mapped region may extend past the specified range. Any such
extension beyond the end of the mapped object will be zero-filled.
The reason for this behavior is that on most architectures it isn't possible
to define a virtual memory protection boundary smaller than a page.
http://www.freebsd.org/cgi/query-pr.cgi?pr=68765
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