Re: [BUG] arm64: an infinite loop in generic_perform_write()

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:

quoted

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.