Re: [PATCH -next] fs: Fix memory leaks in do_renameat2() error paths

Al Viro
2020-10-30T22:22:21Z

On Fri, Oct 30, 2020 at 02:33:11PM -0600, Jens Axboe wrote:
> On 10/30/20 12:49 PM, Al Viro wrote:
> > On Fri, Oct 30, 2020 at 12:46:26PM -0600, Jens Axboe wrote:
> >
> >> See other reply, it's being posted soon, just haven't gotten there yet
> >> and it wasn't ready.
> >>
> >> It's a prep patch so we can call do_renameat2 and pass in a filename
> >> instead. The intent is not to have any functional changes in that prep
> >> patch. But once we can pass in filenames instead of user pointers, it's
> >> usable from io_uring.
> >
> > You do realize that pathname resolution is *NOT* offloadable to helper
> > threads, I hope...
>
> How so? If we have all the necessary context assigned, what's preventing
> it from working?

Semantics of /proc/self/..., for starters (and things like /proc/mounts, etc.
*do* pass through that, /dev/stdin included)