mirror of https://github.com/m-labs/artiq.git
firmware: fix another TOCTTOU race in sync/async RPC code.
This commit is contained in:
parent
583bba8777
commit
dd829afebd
|
@ -514,6 +514,19 @@ pub unsafe fn main() {
|
|||
attribute_writeback(typeinfo as *const ());
|
||||
}
|
||||
|
||||
// Make sure all async RPCs are processed before exiting.
|
||||
// Otherwise, if the comms and kernel CPU run in the following sequence:
|
||||
//
|
||||
// comms kernel
|
||||
// ----------------------- -----------------------
|
||||
// check for async RPC
|
||||
// post async RPC
|
||||
// post RunFinished
|
||||
// check for mailbox
|
||||
//
|
||||
// the async RPC would be missed.
|
||||
send(&RpcFlush);
|
||||
|
||||
send(&RunFinished);
|
||||
|
||||
loop {}
|
||||
|
|
|
@ -64,6 +64,7 @@ pub enum Message<'a> {
|
|||
},
|
||||
RpcRecvRequest(*mut ()),
|
||||
RpcRecvReply(Result<usize, Exception<'a>>),
|
||||
RpcFlush,
|
||||
|
||||
CacheGetRequest { key: &'a str },
|
||||
CacheGetReply { value: &'static [i32] },
|
||||
|
|
|
@ -410,7 +410,13 @@ fn process_kern_message(io: &Io, aux_mutex: &Mutex,
|
|||
kern_acknowledge()
|
||||
}
|
||||
}
|
||||
}
|
||||
},
|
||||
&kern::RpcFlush => {
|
||||
// See ksupport/lib.rs for the reason this request exists.
|
||||
// We do not need to do anything here because of how the main loop is
|
||||
// structured.
|
||||
kern_acknowledge()
|
||||
},
|
||||
|
||||
&kern::CacheGetRequest { key } => {
|
||||
let value = session.congress.cache.get(key);
|
||||
|
|
Loading…
Reference in New Issue