Unsigned driver (UsbtoSerial) on windows vista give access denied in nodadmin user

Question

Dear all, I have usbtoserial unsigned driver , I have installed on windows vista(x64), and driver installed successfully and it detected com port , i am accessing com port uing CreateFile api. It works fine in admin user or select Run as Admin from non admin user. But it does not work in non-admin user , it gives ACCESS_DENIED (GetlastErrroCode 5). Is it signing issue or somethingelse. please let know if anybody have a idea on this. Thanks, Nitesh

Answer 1

Hello Nitesh

I discussed the issue with a senior escalation engineer in Microsoft. It's likely that there's an issue with the Security Descriptor. This article may help:

Specifying a Security Descriptor From an INF File
http://msdn.microsoft.com/en-us/library/aa377450(VS.85).aspx

If you have any other questions, please feel free to tell me.

Regards,
Jialiang Ge

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Answer 2

Thanks Jialiang,

  I  am able to fix the issue using the  WdfDeviceInitAssignSDDLString API in the driver which configure the security decsriptor , finaly non-admin user can access the device.

Best Regards,

Nitesh Patel

Answer 3

Hello Nitesh

I'm glad to know that you have solved this problem. Have a nice day!

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Regards,
Jialiang Ge
MSDN Subscriber Support in Forum
If you have any feedback of our support, please contact [e-mail].
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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