Date: Thu, 22 Sep 2005 14:13:27 +0200 From: "Simon L. Nielsen" <simon@FreeBSD.org> To: Borja Marcos <borjamar@sarenet.es> Cc: freebsd-security@freebsd.org Subject: Re: Mounting filesystems with "noexec" Message-ID: <20050922121326.GA66046@eddie.nitro.dk> In-Reply-To: <F02FC593-8F19-40D4-B1E7-63B78F1E5300@sarenet.es> References: <F02FC593-8F19-40D4-B1E7-63B78F1E5300@sarenet.es>
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On 2005.09.22 13:11:43 +0200, Borja Marcos wrote:
> I've been playing a bit with the "noexec" flag for filesystems. It
> can represent a substantial obstacle against the exploitation of
> security holes.
Please note the following from the mount(8) manual page:
noexec Do not allow execution of any binaries on the mounted
file system. This option is useful for a server that has
file systems containing binaries for architectures other
than its own. Note: This option was not designed as a
security feature and no guarantee is made that it will
prevent malicious code execution; for example, it is
still possible to execute scripts which reside on a
noexec mounted partition.
I don't know if it makes sense to log noexec failures, but at least
it's important that people don't completely rely on noexec for
security.
--
Simon L. Nielsen
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