On Tue, May 9, 2017 at 6:03 PM, Christoph Hellwig [off-list ref] wrote:

On Tue, May 09, 2017 at 06:02:50AM -0700, Christoph Hellwig wrote:

quoted

On Tue, May 09, 2017 at 06:00:01AM -0700, Andy Lutomirski wrote:

quoted

fs/splice.c has some, ahem, interesting uses that have been the source
of nasty exploits in the past.  Converting them to use iov_iter
properly would be really, really nice.  Christoph, I don't suppose
you'd like to do that?

I can take care of all the fs code including this one.

I spent the afternoon hacking up where I'd like this to head.  It's
completely untested as of now:

        http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/setfs-elimination

My older time64_t syscall series has the side-effect of doing something
like this to the time-related compat handlers in kernel/compat.c. If nobody
else has started looking at removing set_fs from those, I can extract
the relevant parts from my series.

      Arnd