linux-kernel - Re: [PATCH 3/3] ANDROID: binder: fix proc->tsk check.

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Message-ID: <CAMi1Hd2NQDnahnrUDG8BNV_2OHRy6XDUnKU+W3fPB+15277mhw@mail.gmail.com>
Date:   Mon, 31 Jul 2017 10:55:00 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Martijn Coenen <maco@...roid.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Todd Kjos <tkjos@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        lkml <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org,
        Martijn Coenen <maco@...gle.com>
Subject: Re: [PATCH 3/3] ANDROID: binder: fix proc->tsk check.

On 28 July 2017 at 17:26, Martijn Coenen <maco@...roid.com> wrote:
> Commit c4ea41ba195d ("binder: use group leader instead of open thread")'
> was incomplete and didn't update a check in binder_mmap(), causing all
> mmap() calls into the binder driver to fail.
>

Fixes Android WiFi/BT regression reported on 4.13-rc2.

Tested-by: Amit Pundir <amit.pundir@...aro.org>

> Signed-off-by: Martijn Coenen <maco@...roid.com>
> ---
>  drivers/android/binder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index f7665c31feca..831cdd7d197d 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -3362,7 +3362,7 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
>         const char *failure_string;
>         struct binder_buffer *buffer;
>
> -       if (proc->tsk != current)
> +       if (proc->tsk != current->group_leader)
>                 return -EINVAL;
>
>         if ((vma->vm_end - vma->vm_start) > SZ_4M)
> --
> 2.14.0.rc0.400.g1c36432dff-goog
>