linux-kernel - Re: [PATCH] binder: fix memory corruption in binder

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Date:   Mon, 11 Sep 2017 17:48:17 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Todd Kjos <tkjos@...roid.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        devel@...verdev.osuosl.org, lkml <linux-kernel@...r.kernel.org>,
        Martijn Coenen <maco@...gle.com>, Todd Kjos <tkjos@...gle.com>,
        xuyiping@...ilicon.com, gengyanping@...ilicon.com,
        shiwanglai@...ilicon.com, John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH] binder: fix memory corruption in binder_transaction binder

On 5 September 2017 at 22:51, Todd Kjos <tkjos@...roid.com> wrote:
> From: Xu YiPing <xuyiping@...ilicon.com>
>
> commit 7a4408c6bd3e ("binder: make sure accesses to proc/thread are
> safe") made a change to enqueue tcomplete to thread->todo before
> enqueuing the transaction. However, in err_dead_proc_or_thread case,
> the tcomplete is directly freed, without dequeued. It may cause the
> thread->todo list to be corrupted.
>
> So, dequeue it before freeing.

I see Android boot loops with this patch on hikey tracking
linux/master branch. 1st boot is fine but hikey runs into an
unexpected short boot loops on 2nd and successive boots.

It takes about 3-4 iterations to finally come to sane state and boot
to UI. I don't see this behaviour if I revert this patch.

Regards,
Amit Pundir

>
> Signed-off-by: Xu YiPing <xuyiping@...ilicon.com>
> Signed-off-by: Todd Kjos <tkjos@...gle.com>
> ---
>  drivers/android/binder.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index d055b3f2a207..96cc28afa383 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -3083,6 +3083,7 @@ static void binder_transaction(struct binder_proc *proc,
>  err_dead_proc_or_thread:
>         return_error = BR_DEAD_REPLY;
>         return_error_line = __LINE__;
> +       binder_dequeue_work(proc, tcomplete);
>  err_translate_failed:
>  err_bad_object_type:
>  err_bad_offset:
> --
> 2.14.1.581.gf28d330327-goog
>