Re: virus scan application
Re: virus scan application
- Subject: Re: virus scan application
- From: Terry Lambert <email@hidden>
- Date: Fri, 3 Aug 2007 11:10:41 -0700
On Aug 3, 2007, at 10:07 AM, Vishal Shetye wrote:
after going through several links like kauth (http://developer.apple.com/technotes/tn2005/tn2127.html
),
KauthORama source, mac osx internals by amit singh, http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming
and many mailing list discussions I find myself really confused.
My simple question is, with currently supported kpis is virus-scan
application really feasible?
It requires hooking of system calls, use kauth vnode scope, so far
so good. But opening file for virus scan (low level open), denying
access, such functions deal with file system structures.
No, they don't.
They deal with you:
(1) Exempting your virus scan daemon from such checks when it makes
requests, by having it register its process with your KEXT
(2) Your KEXT hooking the kauth hooks you are interested in, sending
a message to user space, doing your work there (including calling back
into the kernel and getting a "free pass""on scanining before the
scanner is allowed to open the file)
(3) You sending the result back to the KEXT as to whether the action
should be allowed or denied
(4) Your KEXT allowing/denying the kauth operation that started this
chain of events.
-- Terry
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