On Fri, Jul 28, 2017 at 4:56 AM, Martijn Coenen <maco@xxxxxxxxxxx> 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.
>
> Signed-off-by: Martijn Coenen <maco@xxxxxxxxxxx>
> ---
> 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)
Tested-by: John Stultz <john.stultz@xxxxxxxxxx>
As Amit already confirmed, this resolves the wifi and bluetooth
regression I was seeing with Android using 4.13-rc2.
Though I've not seen it show up in Linus' tree yet, so I wanted to
pester folks so it gets into 4.13-rc (its given me some slight grief
trying to bisect down a separate issue).
thanks
-john
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