Virtualization - Mar 2021 - [PATCH v5 01/11] file: Export __receive_fd() to modules

On Mon, Mar 15, 2021 at 05:46:43PM +0800, Yongji Xie
wrote:
> On Mon, Mar 15, 2021 at 5:08 PM Christoph Hellwig <hch at
infradead.org> wrote:
> >
> > On Mon, Mar 15, 2021 at 01:37:11PM +0800, Xie Yongji wrote:
> > > Export __receive_fd() so that some modules can use
> > > it to pass file descriptor between processes.
> >
> > I really don't think any non-core code should do that, especilly
not
> > modular mere driver code.
> 
> Do you see any issue? Now I think we're able to do that with the help
> of get_unused_fd_flags() and fd_install() in modules. But we may miss
> some security stuff in this way. So I try to export __receive_fd() and
> use it instead.
The real problem is now what helper to use, but rather that random
drivers should not just mess with the FD table like that.