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

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Message-ID: <20210831072416.y4fvshvjeo7eh2dr@wittgenstein>
Date:   Tue, 31 Aug 2021 09:24:16 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Todd Kjos <tkjos@...gle.com>
Cc:     gregkh@...uxfoundation.org, christian@...uner.io, arve@...roid.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        maco@...gle.com, joel@...lfernandes.org, kernel-team@...roid.com
Subject: Re: [PATCH] binder: make sure fd closes complete

On Mon, Aug 30, 2021 at 12:51:46PM -0700, Todd Kjos 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>
> ---

Looks good. Thanks!
Acked-by: Christian Brauner <christian.brauner@...ntu.com>