On Sep 25, 2013, at 6:14 AM, parmeshwr_pra...@dell.com wrote:
> Dell - Internal Use - Confidential
>
> Hi All,
>
> I have developed below code, it is crashing the system, can anybody tell me
> why ? what is solution ?
> EFI_STATUS
> EFIAPI
> UefiMain(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE * SystemTable)
> {
> EFI_STATUS Status;
> EFI_SCSI_IO_PROTOCOL passthrough;
> EFI_DRIVER_BINDING_PROTOCOL *This;
>
Parmeshwr,
Your code examples seem to imply that local C variables are initialized, they
are not. You may find this helpful in understanding how local variables work in
C http://en.wikipedia.org/wiki/Stack_buffer_overflow
In general IN is a comment and it means valid data is being passed in. You
need to initialize this data before you pass it in to an EFI call.
> gST->ConOut->OutputString(gST->ConOut, L"Mirror started\n");
>
> Print(L"ParamTest\n\r");
> Status =
> gBS->OpenProtocol(ImageHandle, &gEfiScsiIoProtocolGuid,
> (VOID **) & passthrough,
OpenProtocol returns a pointer to a pointer. You are passing in the address of
a structure. So the first 8 (assuming X64) bytes of passthrough are going to
contain a pointer to the returned passthrough protocol. So you want
EFI_SCSI_IO_PROTOCOL *passthrough;
> This->DriverBindingHandle,
This currently points to a random place. So dereferencing This to get
DriverBindingHandle is just passing in random junk.
> NULL,
> EFI_OPEN_PROTOCOL_BY_DRIVER);
> if (EFI_ERROR(Status)) {
> gST->ConOut->OutputString(gST->ConOut, L"Error\n");
> Print(L"Error !!!!!!!\n");
> return Status;
> }
>
> Print(L"ParamTest\n\r");
>
>
>
> Best Regards,
> Parmeshwr Prasad
> Tel : +91-9743262018
> <image001.png>
>
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