From: Eric Paris <eparis@redhat.com>
To: Pavel Machek <pavel@suse.cz>
Cc: tvrtko.ursulin@sophos.com, davecb@sun.com, david@lang.hm,
Adrian Bunk <bunk@kernel.org>, Peter Dolding <oiaohm@gmail.com>,
rmeijer@xs4all.nl, Mihai Don??u <mdontu@bitdefender.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
malware-list@lists.printk.net,
linux-security-module@vger.kernel.org,
malware-list-bounces@dmesg.printk.net,
Casey Schaufler <casey@schaufler-ca.com>,
capibara@xs4all.nl, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [malware-list] scanner interface proposal was: [TALPA] Intro to a linux interface for on access scanning
Date: Mon, 18 Aug 2008 19:07:04 -0400 [thread overview]
Message-ID: <1219100824.15566.151.camel@localhost.localdomain> (raw)
In-Reply-To: <20080818224058.GA2311@elf.ucw.cz>
On Tue, 2008-08-19 at 00:40 +0200, Pavel Machek wrote:
> Hi!
>
> > > On Mon, Aug 18, 2008 at 02:15:24PM +0100, tvrtko.ursulin@sophos.com
> > wrote:
> > > > Then there is still a question of who allows some binary to declare
> > itself
> > > > exempt. If that decision was a mistake, or it gets compromised
> > security
> > > > will be off. A very powerful mechanism which must not be easily
> > > > accessible. With a good cache your worries go away even without a
> > scheme
> > > > like this.
> > >
> > > I have one word for you --- bittorrent. If you are downloading a very
> > > large torrent (say approximately a gigabyte), and it contains many
> > > pdf's that are say a few megabytes a piece, and things are coming in
> > > tribbles, having either a indexing scanner or an AV scanner wake up
> > > and rescan the file from scratch each time a tiny piece of the pdf
> > > comes in is going to eat your machine alive....
> >
> > Huh? I was never advocating re-scan after each modification and I even
> > explicitly said it does not make sense for AV not only for performance but
> > because it will be useless most of the time. I thought sending out
> > modified notification on close makes sense because it is a natural point,
> > unless someone is trying to subvert which is out of scope. Other
> > have
>
> Why do you think non-malicious applications won't write after close /
> keep file open forever?
If you ask this one more time without reading the many times I've
answered these questions I think I'm going to explode.
Permissions checks are done on open/read. Decisions are invalidated at
mtime update, which INCLUDES mmap after close! I don't care if you keep
your file open forever, if you wrote to it, we are just going to scan it
next time a process decided to open/read it. Please stop confusing this
already long and almost pointless thread with implementation details
that have repeatedly been explained.
-Eric
next prev parent reply other threads:[~2008-08-18 23:09 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <alpine.DEB.1.10.0808180444390.12859@asgard.lang.hm>
[not found] ` <20080818131628.1C2A22FE82F@pmx1.sophos.com>
2008-08-18 14:25 ` [malware-list] scanner interface proposal was: [TALPA] Intro to a linux interface for on access scanning Theodore Tso
2008-08-18 15:31 ` tvrtko.ursulin
2008-08-18 15:31 ` Alan Cox
2008-08-18 13:42 ` David Collier-Brown
2008-08-18 17:53 ` Alan Cox
2008-08-18 18:13 ` david
2008-08-18 15:58 ` tvrtko.ursulin
2008-08-18 17:13 ` david
2008-08-18 16:15 ` Eric Paris
2008-08-18 16:15 ` Alan Cox
2008-08-18 16:54 ` douglas.leeder
2008-08-18 16:40 ` Alan Cox
2008-08-18 17:28 ` Eric Paris
2008-08-18 17:25 ` Alan Cox
2008-08-18 17:54 ` Eric Paris
2008-08-18 18:30 ` Eric Paris
2008-08-18 18:51 ` Alan Cox
2008-08-18 18:35 ` Jan Harkes
2008-08-18 18:46 ` Eric Paris
2008-08-18 19:04 ` david
2008-08-20 2:44 ` [malware-list] scanner interface proposal was: [TALPA] Intro linux interface for for " david
2008-08-20 15:15 ` Eric Paris
2008-08-20 17:33 ` david
2008-08-20 19:26 ` Eric Paris
2008-08-21 0:42 ` david
2008-08-20 17:50 ` david
2008-08-21 14:35 ` [malware-list] scanner interface proposal was: [TALPA] Intro linux interface " douglas.leeder
2008-08-21 21:19 ` david
2008-08-22 15:09 ` [malware-list] scanner interface proposal was: [TALPA] Intro linux interface for " Pavel Machek
2008-08-23 7:28 ` david
2008-08-18 19:32 ` [malware-list] scanner interface proposal was: [TALPA] Intro to a linux interface for on " Jan Harkes
2008-08-18 17:38 ` david
2008-08-18 17:29 ` david
2008-08-18 17:39 ` Eric Paris
2008-08-18 18:09 ` david
2008-08-18 18:34 ` Eric Paris
2008-08-18 17:07 ` david
2008-08-19 8:40 ` tvrtko.ursulin
2008-08-18 22:40 ` Pavel Machek
2008-08-18 23:07 ` Eric Paris [this message]
2008-08-19 1:15 ` Peter Dolding
2008-08-19 8:09 ` douglas.leeder
2008-08-19 11:08 ` Peter Dolding
[not found] ` <20080819114040.2FD1B336880@pmx1.sophos.com>
2008-08-20 3:03 ` Peter Dolding
2008-08-18 16:28 ` douglas.leeder
[not found] <alpine.DEB.1.10.0808180951470.15109@asgard.lang.hm>
2008-08-19 8:31 ` tvrtko.ursulin
2008-08-19 16:07 ` david
2008-08-19 12:34 ` David Collier-Brown
[not found] <20080818101625.85CA12FE876@pmx1.sophos.com>
2008-08-18 10:35 ` douglas.leeder
2008-08-18 12:13 ` david
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