linux-kernel - Re: [PATCH] binder: make sure fd closes complete

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Message-ID: <YTD3maFb22LIsh/U@kroah.com>
Date:   Thu, 2 Sep 2021 18:11:05 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Todd Kjos <tkjos@...gle.com>
Cc:     Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>,
        Arve Hjønnevåg <arve@...roid.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Martijn Coenen <maco@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        kernel-team@...roid.com, stable <stable@...r.kernel.org>
Subject: Re: [PATCH] binder: make sure fd closes complete

On Thu, Sep 02, 2021 at 08:35:35AM -0700, Todd Kjos wrote:
> On Tue, Aug 31, 2021 at 12:24 AM Martijn Coenen <maco@...roid.com> wrote:
> >
> > On Mon, Aug 30, 2021 at 9:51 PM 'Todd Kjos' via kernel-team
> > <kernel-team@...roid.com> wrote:
> > >
> > > During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object
> > > cleanup may close 1 or more fds. The close operations are
> > > completed using the task work mechanism -- which means the thread
> > > needs to return to userspace or the file object may never be
> > > dereferenced -- which can lead to hung processes.
> > >
> > > Force the binder thread back to userspace if an fd is closed during
> > > BC_FREE_BUFFER handling.
> > >
> > > Signed-off-by: Todd Kjos <tkjos@...gle.com>
> > Reviewed-by: Martijn Coenen <maco@...roid.com>
> 
> Please also add to stable releases 5.4 and later.

I'll try to remember to tag this as-such after 5.15-rc1 is out and I can
apply it to my tree.  But in the future, it's best if you add the cc:
stable to the patch yourself so I don't have to do it "by hand" after
the fact.

thanks,

greg k-h