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// SPDX-License-Identifier: GPL-2.0
use kernel::{
bindings,
prelude::*,
security,
sync::{Arc, Mutex, UniqueArc},
};
use crate::{
node::NodeRef,
thread::{BinderError, BinderResult},
};
struct Manager {
node: Option<NodeRef>,
uid: Option<bindings::kuid_t>,
}
pub(crate) struct Context {
manager: Mutex<Manager>,
}
#[allow(clippy::non_send_fields_in_send_ty)]
unsafe impl Send for Context {}
unsafe impl Sync for Context {}
impl Context {
pub(crate) fn new() -> Result<Arc<Self>> {
let mut ctx = Pin::from(UniqueArc::try_new(Self {
// SAFETY: Init is called below.
manager: unsafe {
Mutex::new(Manager {
node: None,
uid: None,
})
},
})?);
// SAFETY: `manager` is also pinned when `ctx` is.
let manager = unsafe { ctx.as_mut().map_unchecked_mut(|c| &mut c.manager) };
kernel::mutex_init!(manager, "Context::manager");
Ok(ctx.into())
}
pub(crate) fn set_manager_node(&self, node_ref: NodeRef) -> Result {
let mut manager = self.manager.lock();
if manager.node.is_some() {
return Err(EBUSY);
}
security::binder_set_context_mgr(&node_ref.node.owner.cred)?;
// TODO: Get the actual caller id.
let caller_uid = bindings::kuid_t::default();
if let Some(ref uid) = manager.uid {
if uid.val != caller_uid.val {
return Err(EPERM);
}
}
manager.node = Some(node_ref);
manager.uid = Some(caller_uid);
Ok(())
}
pub(crate) fn unset_manager_node(&self) {
let node_ref = self.manager.lock().node.take();
drop(node_ref);
}
pub(crate) fn get_manager_node(&self, strong: bool) -> BinderResult<NodeRef> {
self.manager
.lock()
.node
.as_ref()
.ok_or_else(BinderError::new_dead)?
.clone(strong)
}
}
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