[PATCH] ANDROID: binder: prevent transactions into own process.

[Martijn Coenen]

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 at syzkaller.appspotmail.com
Signed-off-by: Martijn Coenen <maco at android.com>
---
 drivers/android/binder.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index e7e4560e4c6e..57d4ba926ed0 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3001,6 +3001,14 @@ 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_node->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) {
 			/*
-- 
2.17.0.rc0.231.g781580f067-goog