binder: Store node flags on creation.

We'll need these flags to determine if a node allows file descriptors to
be transferred through them.

Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>

Author: wedsonaf

drivers/android/node.rs

@@ -212,13 +212,14 @@ pub(crate) struct Node {
     pub(crate) global_id: u64,
     ptr: usize,
     cookie: usize,
+    pub(crate) flags: u32,
     pub(crate) owner: Ref<Process>,
     inner: LockedBy<NodeInner, Mutex<ProcessInner>>,
     links: Links<dyn DeliverToRead>,
 }
 
 impl Node {
-    pub(crate) fn new(ptr: usize, cookie: usize, owner: Ref<Process>) -> Self {
+    pub(crate) fn new(ptr: usize, cookie: usize, flags: u32, owner: Ref<Process>) -> Self {
         static NEXT_ID: AtomicU64 = AtomicU64::new(1);
         let inner = LockedBy::new(
             &owner.inner,
@@ -232,6 +233,7 @@ impl Node {
             global_id: NEXT_ID.fetch_add(1, Ordering::Relaxed),
             ptr,
             cookie,
+            flags,
             owner,
             inner,
             links: Links::new(),

drivers/android/process.rs

@@ -367,12 +367,18 @@ impl Process {
     }
 
     fn set_as_manager(&self, info: Option<FlatBinderObject>, thread: &Thread) -> Result {
-        let (ptr, cookie) = if let Some(obj) = info {
-            (unsafe { obj.__bindgen_anon_1.binder }, obj.cookie)
+        let (ptr, cookie, flags) = if let Some(obj) = info {
+            (
+                // SAFETY: The object type for this ioctl is implicitly `BINDER_TYPE_BINDER`, so it
+                // is safe to access the `binder` field.
+                unsafe { obj.__bindgen_anon_1.binder },
+                obj.cookie,
+                obj.flags,
+            )
         } else {
-            (0, 0)
+            (0, 0, 0)
         };
-        let node_ref = self.get_node(ptr as _, cookie as _, true, Some(thread))?;
+        let node_ref = self.get_node(ptr as _, cookie as _, flags as _, true, Some(thread))?;
         let node = node_ref.node.clone();
         self.ctx.set_manager_node(node_ref)?;
         self.inner.lock().is_manager = true;
@@ -387,6 +393,7 @@ impl Process {
         &self,
         ptr: usize,
         cookie: usize,
+        flags: u32,
         strong: bool,
         thread: Option<&Thread>,
     ) -> Result<NodeRef> {
@@ -399,7 +406,7 @@ impl Process {
         }
 
         // Allocate the node before reacquiring the lock.
-        let node = Arc::try_new(Node::new(ptr, cookie, Ref::new_from(self)))?;
+        let node = Arc::try_new(Node::new(ptr, cookie, flags, Ref::new_from(self)))?;
 
         let mut inner = self.inner.lock();
         if let Some(node) = inner.get_existing_node_ref(ptr, cookie, strong, thread)? {

drivers/android/thread.rs

@@ -389,7 +389,10 @@ impl Thread {
                     // SAFETY: The type is `BINDER_TYPE_{WEAK_}BINDER`, so `binder` is populated.
                     let ptr = unsafe { obj.__bindgen_anon_1.binder } as _;
                     let cookie = obj.cookie as _;
-                    Ok(self.process.get_node(ptr, cookie, strong, Some(self))?)
+                    let flags = obj.flags as _;
+                    Ok(self
+                        .process
+                        .get_node(ptr, cookie, flags, strong, Some(self))?)
                 })?;
             }
             bindings::BINDER_TYPE_WEAK_HANDLE | bindings::BINDER_TYPE_HANDLE => {