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RE: Re: [ntdev] One instance of UMDF device

Doron_HolanDoron_Holan Member - All Emails Posts: 10,499
A shared section is a security boundary issue. Any low level process can loadlibrary the dll and then manipulate the shared value, affecting the actual umdf process when it is loaded afterwards

d

Bent from my phone
________________________________
From: Marion Bond
Sent: ?12/?3/?2014 3:54 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] Re: [ntdev] One instance of UMDF device

With the caveat that I have never programmed UMDF my understanding is that they are just a UM DLL so a variable in a shared section should work as a global right?

Sent from Surface Pro

From: [email protected]
Sent: ?Wednesday?, ?December? ?03?, ?2014 ?5?:?05? ?PM
To: Windows System Software Devs Interest List

Thanks again, Mr. Wieland.

Might I suggest a doc bug to note under WdfDriverCreate that specifying a Context area for a WDFDRIVER Object with UMDF 2 might not act as expected?

In fact, would it not make sense to actually PREVENT folks from specifying a Context area for a WDFDRIVER (logging something to the log and returning an error to WdfDriverCreate), to avoid what is certainly a difficult to understand problem that's unique to UMDF? That really would be an insidious problem to find.

Peter
OSR
@OSRDrivers


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