On Fri, 17 May 2019, Eric W. Biederman wrote: > Wow I got a little distracted but now I am back to this. > > Using your test program I was able to test the basics of this. > > I found one bug in my patch where I was missing a memset. So I have > corrected that, and reorganized the patch a little bit. > > I have not figured out how to trigger a usb disconnect so I have not > tested that. Heh. Assuming the device file you tell the test program to use corresponds to an actual USB device, you can trigger a disconnect by literally unplugging the USB cable. (Add a 10-second delay to the program to give yourself enough time.) > The big thing I have not been able to test is running a 64bit big-endian > kernel with a 32bit user space. My modified version of your test > program should report "Bad" without my patch, and should report "Good" > with it. > > Is there any chance you can test that configuration? I could not figure > out how to get a 64bit big-endian system running in qemu, and I don't > have the necessary hardware so I was not able to test that at all. As > that is the actual bug I am still hoping someone can test it. Unfortunately, I don't have any big-endian systems either. Alan Stern
