On 2016/1/19 15:33, Greg KH wrote:
On Tue, Jan 19, 2016 at 11:45:36AM +0800, Chen Feng wrote:
When a process fork a child process, we should not allow the child process use the binder which opened by parent process.
But if the binder-object creater is a thread of one process who exit, the other thread can also use this binder-object normally. We can distinguish this by the member proc->tsk->mm. If the thread exit the tsk->mm will be NULL.
proc->tsk->mm != current->mm && proc->tsk->mm
So only allow the shared mm_struct to use the same binder-object and check the existence of mm_struct.
Signed-off-by: Chen Feng puck.chen@hisilicon.com Signed-off-by: Wei Dong weidong2@hisilicon.com Signed-off-by: Junmin Zhao zhaojunmin@huawei.com Reviewed-by: Zhuangluan Su suzhuangluan@hisilicon.com
drivers/android/binder.c | 2 ++ 1 file changed, 2 insertions(+)
Why resend? What changed from the previous version?
My fault, it's my error commit. mistake the current->mm with current->tsk->mm. The robot-compile finds out this error.
greg k-h
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