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Can not open file in the callback of IRP_MJ_SET_INFORMATION post operation

ruslan090ruslan090 Member Posts: 3
in NTFSD

Hello. As the title implied, I have a problem in opening file in the callback of IRP_MJ_SET_INFORMATION post operation.
My project is inherited from Microsoft "scanner" minifilter project in github.
I want to open file after the file is renamed. So I registered callbacks to IRP_MJ_SET_INFORMATION event.
Originally I tried to open a file in pre operation callback. But file handler is not fully released, so failed in opening file.
So I tried to open file in post operation of IRP_MJ_SET_INFORMATION event. But still can not open file.
What should I do if I want to open file in that callback?
Thanks in advance.

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Comments

  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,219
    • What is the status that you get. That is usually a good hint
    • Odd things happen after rename of a file on RDR, is this your situation?
    • What does “ But file handler is not fully released, so failed in opening file” mean. No I am not going to the sample code
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  • ruslan090ruslan090 Member Posts: 3

    Thanks for your reply.

    @rod_widdowson said:

    • What is the status that you get. That is usually a good hint

    Driver mode send file path to user mode. Then, user mode tries to open that file using "fopen". GetLastError returns 32. It means:ERROR_SHARING_VIOLATION The process cannot access the file because it is being used by another process.

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  • ruslan090ruslan090 Member Posts: 3

    BTW, Is there any way to giveup file access privilege so other process can access that file in minifilter?

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