linux-kernel - Re: Out of tree module using LSM

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Message-ID: <Pine.LNX.4.64.0711291748140.13075@fbirervta.pbzchgretzou.qr>
Date:	Thu, 29 Nov 2007 17:52:19 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jon Masters <jcm@...hat.com>
cc:	James Morris <jmorris@...ei.org>, tvrtko.ursulin@...hos.com,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: Out of tree module using LSM


On Nov 29 2007 11:27, Jon Masters wrote:
>
>They (virus protection folks) generally think they want to intercept
>various system calls, such as open() and block until they have performed
>a scan operation on the file. I explained the mmap issue [...]

If open and close was everything, then that would be wonderful. You
could only wonder how many false positives scanners could bring up if
they checked every write() for signatures - not to mention
performance bogdown.

>they just want to scan files and take some action if a file is
>"bad". That's it really.
>
struct security->dentry_open sounds like the candidate, together
with relayfs with submits filenames to userspace.

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