ANDROID: binder: prevent transactions into own process.

This can't happen with normal nodes (because you can't get a ref
to a node you own), but it could happen with the context manager;
to make the behavior consistent with regular nodes, reject
transactions into the context manager by the process owning it.

Reported-by: syzbot+09e05aba06723a94d43d@syzkaller.appspotmail.com
Signed-off-by: Martijn Coenen <maco@android.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 764b63a5aadefe5c73ef849ee5b377b134e3841e..e578eee315895d8c2783b933f5c252f5ec53824b 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2839,6 +2839,14 @@ static void binder_transaction(struct binder_proc *proc,
                        else
                                return_error = BR_DEAD_REPLY;
                        mutex_unlock(&context->context_mgr_node_lock);
+                       if (target_node && target_proc == proc) {
+                               binder_user_error("%d:%d got transaction to context manager from process owning it\n",
+                                                 proc->pid, thread->pid);
+                               return_error = BR_FAILED_REPLY;
+                               return_error_param = -EINVAL;
+                               return_error_line = __LINE__;
+                               goto err_invalid_target_handle;
+                       }
                }
                if (!target_node) {
                        /*