On Thu, Jun 24, 2021 at 04:24:46AM +0100, Matthew Wilcox wrote:
> On Thu, Jun 24, 2021 at 11:10:41AM +0800, Chen Huang wrote:
> > In userspace, I perform such operation:
> >
> > fd = open("/tmp/test", O_RDWR | O_SYNC);
> > access_address = (char *)mmap(NULL, uio_size, PROT_READ, MAP_SHARED, uio_fd, 0);
> > ret = write(fd, access_address + 2, sizeof(long));
>
> ... you know that accessing this at unaligned offsets isn't going to
> work. It's completely meaningless. Why are you trying to do it?
We still should not cause an infinite loop in kernel space due to a
a userspace programmer error.
