ANDROID: binder: Add BINDER_GET_NODE_DEBUG_INFO ioctl

The BINDER_GET_NODE_DEBUG_INFO ioctl will return debug info on
a node.  Each successive call reusing the previous return value
will return the next node.  The data will be used by
libmemunreachable to mark the pointers with kernel references
as reachable.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 7668b5791c91..84a9a0944e13 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -186,6 +186,19 @@ struct binder_version {
 #define BINDER_CURRENT_PROTOCOL_VERSION 8
 #endif
 
+/*
+ * Use with BINDER_GET_NODE_DEBUG_INFO, driver reads ptr, writes to all fields.
+ * Set ptr to NULL for the first call to get the info for the first node, and
+ * then repeat the call passing the previously returned value to get the next
+ * nodes.  ptr will be 0 when there are no more nodes.
+ */
+struct binder_node_debug_info {
+        binder_uintptr_t ptr;
+        binder_uintptr_t cookie;
+        __u32            has_strong_ref;
+        __u32            has_weak_ref;
+};
+
 #define BINDER_WRITE_READ               _IOWR('b', 1, struct binder_write_read)
 #define BINDER_SET_IDLE_TIMEOUT         _IOW('b', 3, __s64)
 #define BINDER_SET_MAX_THREADS          _IOW('b', 5, __u32)
@@ -193,6 +206,7 @@ struct binder_version {
 #define BINDER_SET_CONTEXT_MGR          _IOW('b', 7, __s32)
 #define BINDER_THREAD_EXIT              _IOW('b', 8, __s32)
 #define BINDER_VERSION                  _IOWR('b', 9, struct binder_version)
+#define BINDER_GET_NODE_DEBUG_INFO      _IOWR('b', 11, struct binder_node_debug_info)
 
 /*
  * NOTE: Two special error codes you should check for when calling