Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c"

[Matthew Wilcox]

On Thu, Oct 22, 2020 at 04:35:17PM +0000, David Laight wrote:
> Wait...
> readv(2) defines:
> 	ssize_t readv(int fd, const struct iovec *iov, int iovcnt);

It doesn't really matter what the manpage says.  What does the AOSP
libc header say?

> But the syscall is defined as:
> 
> SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
>                 unsigned long, vlen)
> {
>         return do_readv(fd, vec, vlen, 0);
> }