[PATCH 1/2] file: Export receive_fd() to modules

Yongji Xie xieyongji at bytedance.com
Thu Apr 1 10:24:37 UTC 2021


On Thu, Apr 1, 2021 at 5:52 PM Greg KH <gregkh at linuxfoundation.org> wrote:
>
> On Thu, Apr 01, 2021 at 05:09:31PM +0800, Xie Yongji wrote:
> > Export receive_fd() so that some modules can use
> > it to pass file descriptor across processes without
> > missing any security stuffs.
> >
> > Signed-off-by: Xie Yongji <xieyongji at bytedance.com>
> > ---
> >  fs/file.c            | 6 ++++++
> >  include/linux/file.h | 7 +++----
> >  2 files changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/fs/file.c b/fs/file.c
> > index 56986e55befa..2a80c6c3e147 100644
> > --- a/fs/file.c
> > +++ b/fs/file.c
> > @@ -1107,6 +1107,12 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags)
> >       return new_fd;
> >  }
> >
> > +int receive_fd(struct file *file, unsigned int o_flags)
> > +{
> > +     return __receive_fd(file, NULL, o_flags);
> > +}
> > +EXPORT_SYMBOL(receive_fd);
>
> What module uses this?
>

Looks like now it will be only used by the module in my proposal:

https://lore.kernel.org/linux-fsdevel/20210331080519.172-1-xieyongji@bytedance.com/

> And why not EXPORT_SYMBOL_GPL()?
>

My fault, sorry.

Thanks,
Yongji


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