I noticed that when I do two SG_IO ioctls to a target device (say, tape drive, disk drive, whatever) in which the first request is well formed (e.g. an inquiry) and the second one has a malformed CDB, such that it gets check condition with sense key == 5 (ILLEGAL REQUEST), the data buffer returned for the second malformed SG_IO request is filled out with the same data as was returned for the first successful command (e.g. the same inquiry data again.) I'm using separate data buffers for the two commands, and memsetting them to zero before calling ioctl(). I don't think this data is coming from the device, as it happens with every device I've tried.
Is that normal? Seems like for a malformed request, the data buffer should not be transferred at all, much less transferred with contents of a prior request's data buffer. Kernel is 2.6.18 from kernel.org. The two requests were done from the same process, I haven't tried two separate processes to see if one process could by this method access another process's data. I did try using two devices, so the first well formed command went to one device, and the 2nd, malformed command went to another device. In that case, I didn't get the same buffer back again, but garbage. (some recognizeable strings, "en_US" was in there...) Is this a problem, or is this a matter of "just don't do that."? Thanks, -- steve - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
