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haha01haha01
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 Posted: Fri Apr 10, 2009 1:13 pm Post subject: Driver Question |
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I made a simple driver (based on an example code i saw) that prints everything inputted to it (using CreateFile->WriteFile), but i seem to get a BSoD when calling MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority) to determine the input buffer's address. this is the IRP_MJ_WRITE function (where the BSoD occures) and this is the whole application's code.
anyone know what is the problem or can tell me a different method to read the data sent with WriteFile?
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HomerSexual
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| Posted: Fri Apr 10, 2009 8:29 pm Post subject: |
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check Irp->MdlAddress also
| Code: | | if(pIoStackIrp && Irp->MdlAddress) |
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haha01haha01
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| Posted: Sat Apr 11, 2009 2:13 am Post subject: |
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| blankrider wrote: |
check Irp->MdlAddress also
| Code: | | if(pIoStackIrp && Irp->MdlAddress) |
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oh, i see...
now it doesnt crash, but every time i call WriteFile it skips it because MdlAddress is null. what should i do to get it to work? im using this code:
| Code: | HANDLE h;
DWORD result;
h = CreateFile(L"\\\\.\\Example",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
WriteFile(h,"Test",sizeof("Test"),&result,NULL);
CloseHandle(h);
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HomerSexual
Grandmaster Cheater Supreme
Reputation: 5
Joined: 03 Feb 2007
Posts: 1657
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| Posted: Sat Apr 11, 2009 8:13 am Post subject: |
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| haha01haha01 wrote: | | blankrider wrote: |
check Irp->MdlAddress also
| Code: | | if(pIoStackIrp && Irp->MdlAddress) |
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oh, i see...
now it doesnt crash, but every time i call WriteFile it skips it because MdlAddress is null. what should i do to get it to work? im using this code:
| Code: | HANDLE h;
DWORD result;
h = CreateFile(L"\\\\.\\Example",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
WriteFile(h,"Test",sizeof("Test"),&result,NULL);
CloseHandle(h);
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does DeviceCreate's message come up? If it doesn't then it isn't creating the file. Check to see if h is valid. Call getlasterror after CreateFile and after WriteFile.
edit:
Also use
| Code: | | IoCompleteRequest(Irp, IO_NO_INCREMENT); |
Everytime the Irp is used as a parameter to the function
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haha01haha01
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| Posted: Sat Apr 11, 2009 11:24 am Post subject: |
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| blankrider wrote: | | haha01haha01 wrote: | | blankrider wrote: |
check Irp->MdlAddress also
| Code: | | if(pIoStackIrp && Irp->MdlAddress) |
|
oh, i see...
now it doesnt crash, but every time i call WriteFile it skips it because MdlAddress is null. what should i do to get it to work? im using this code:
| Code: | HANDLE h;
DWORD result;
h = CreateFile(L"\\\\.\\Example",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
WriteFile(h,"Test",sizeof("Test"),&result,NULL);
CloseHandle(h);
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does DeviceCreate's message come up? If it doesn't then it isn't creating the file. Check to see if h is valid. Call getlasterror after CreateFile and after WriteFile.
edit:
Also use
| Code: | | IoCompleteRequest(Irp, IO_NO_INCREMENT); |
Everytime the Irp is used as a parameter to the function |
CreateFile and CloseHandle succeeds, and the handle is valid (around 0x160). also, this happens from the first time Irp is used, so i doubt the problem is the request not completed.
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HomerSexual
Grandmaster Cheater Supreme
Reputation: 5
Joined: 03 Feb 2007
Posts: 1657
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| Posted: Sat Apr 11, 2009 5:42 pm Post subject: |
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| haha01haha01 wrote: | | blankrider wrote: | | haha01haha01 wrote: | | blankrider wrote: |
check Irp->MdlAddress also
| Code: | | if(pIoStackIrp && Irp->MdlAddress) |
|
oh, i see...
now it doesnt crash, but every time i call WriteFile it skips it because MdlAddress is null. what should i do to get it to work? im using this code:
| Code: | HANDLE h;
DWORD result;
h = CreateFile(L"\\\\.\\Example",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
WriteFile(h,"Test",sizeof("Test"),&result,NULL);
CloseHandle(h);
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does DeviceCreate's message come up? If it doesn't then it isn't creating the file. Check to see if h is valid. Call getlasterror after CreateFile and after WriteFile.
edit:
Also use
| Code: | | IoCompleteRequest(Irp, IO_NO_INCREMENT); |
Everytime the Irp is used as a parameter to the function |
CreateFile and CloseHandle succeeds, and the handle is valid (around 0x160). also, this happens from the first time Irp is used, so i doubt the problem is the request not completed. |
When you call CreateDevice the IRP is being used. Just try it. I really can't find out what the issue is. Upload your current source & other files so i can load it and try it out. Upload them as a rar folder so i can just compile and run
FOUND ERROR:
Tested this and it works
You have to specify the input type. Just put this code in the entry before creating the symbolic link.
| Code: | | pDeviceObject->Flags |= DO_DIRECT_IO; |
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