Enable some timeouts in SGX platform

src/libstd/sync/condvar.rs

@@ -695,7 +695,6 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "emscripten", ignore)]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn wait_timeout_wait() {
         let m = Arc::new(Mutex::new(()));
         let c = Arc::new(Condvar::new());
@@ -715,7 +714,6 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "emscripten", ignore)]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn wait_timeout_while_wait() {
         let m = Arc::new(Mutex::new(()));
         let c = Arc::new(Condvar::new());
@@ -740,7 +738,6 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "emscripten", ignore)]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn wait_timeout_while_wake() {
         let pair = Arc::new((Mutex::new(false), Condvar::new()));
         let pair_copy = pair.clone();
@@ -764,7 +761,6 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "emscripten", ignore)]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn wait_timeout_wake() {
         let m = Arc::new(Mutex::new(()));
         let c = Arc::new(Condvar::new());

src/libstd/sync/mpsc/mod.rs

@@ -2088,7 +2088,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn oneshot_single_thread_recv_timeout() {
         let (tx, rx) = channel();
         tx.send(()).unwrap();
@@ -2099,7 +2098,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn stress_recv_timeout_two_threads() {
         let (tx, rx) = channel();
         let stress = stress_factor() + 100;
@@ -2130,7 +2128,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn recv_timeout_upgrade() {
         let (tx, rx) = channel::<()>();
         let timeout = Duration::from_millis(1);
@@ -2142,7 +2139,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn stress_recv_timeout_shared() {
         let (tx, rx) = channel();
         let stress = stress_factor() + 100;
@@ -2173,7 +2169,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn very_long_recv_timeout_wont_panic() {
         let (tx, rx) = channel::<()>();
         let join_handle =
@@ -2196,7 +2191,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn shared_recv_timeout() {
         let (tx, rx) = channel();
         let total = 5;
@@ -2426,7 +2420,6 @@ mod sync_tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn recv_timeout() {
         let (tx, rx) = sync_channel::<i32>(1);
         assert_eq!(rx.recv_timeout(Duration::from_millis(1)), Err(RecvTimeoutError::Timeout));
@@ -2518,7 +2511,6 @@ mod sync_tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn stress_recv_timeout_two_threads() {
         let (tx, rx) = sync_channel::<i32>(0);
 
@@ -2544,7 +2536,6 @@ mod sync_tests {
     }
 
     #[test]
-    #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     fn stress_recv_timeout_shared() {
         const AMT: u32 = 1000;
         const NTHREADS: u32 = 8;

src/libstd/sys/sgx/abi/usercalls/mod.rs

@@ -1,5 +1,7 @@
 use crate::cmp;
+use crate::convert::TryFrom;
 use crate::io::{Error as IoError, IoSlice, IoSliceMut, Result as IoResult};
+use crate::sys::rand::rdrand64;
 use crate::time::Duration;
 
 pub(crate) mod alloc;
@@ -149,7 +151,21 @@ pub fn exit(panic: bool) -> ! {
 
 /// Usercall `wait`. See the ABI documentation for more information.
 #[unstable(feature = "sgx_platform", issue = "56975")]
-pub fn wait(event_mask: u64, timeout: u64) -> IoResult<u64> {
+pub fn wait(event_mask: u64, mut timeout: u64) -> IoResult<u64> {
+    if timeout != WAIT_NO && timeout != WAIT_INDEFINITE {
+        // We don't want people to rely on accuracy of timeouts to make
+        // security decisions in an SGX enclave. That's why we add a random
+        // amount not exceeding +/- 10% to the timeout value to discourage
+        // people from relying on accuracy of timeouts while providing a way
+        // to make things work in other cases. Note that in the SGX threat
+        // model the enclave runner which is serving the wait usercall is not
+        // trusted to ensure accurate timeouts.
+        if let Ok(timeout_signed) = i64::try_from(timeout) {
+            let tenth = timeout_signed / 10;
+            let deviation = (rdrand64() as i64).checked_rem(tenth).unwrap_or(0);
+            timeout = timeout_signed.saturating_add(deviation) as _;
+        }
+    }
     unsafe { raw::wait(event_mask, timeout).from_sgx_result() }
 }
 

src/libstd/sys/sgx/condvar.rs

@@ -31,8 +31,10 @@ impl Condvar {
         mutex.lock()
     }
 
-    pub unsafe fn wait_timeout(&self, _mutex: &Mutex, _dur: Duration) -> bool {
-        rtabort!("timeout not supported in SGX");
+    pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
+        let success = WaitQueue::wait_timeout(&self.inner, dur, || mutex.unlock());
+        mutex.lock();
+        success
     }
 
     #[inline]

src/libstd/sys/sgx/mod.rs

@@ -110,6 +110,83 @@ pub fn decode_error_kind(code: i32) -> ErrorKind {
     }
 }
 
+// This function makes an effort to wait for a non-spurious event at least as
+// long as `duration`. Note that in general there is no guarantee about accuracy
+// of time and timeouts in SGX model. The enclave runner serving usercalls may
+// lie about current time and/or ignore timeout values.
+//
+// Once the event is observed, `woken_up` will be used to determine whether or
+// not the event was spurious.
+//
+// FIXME: note these caveats in documentation of all public types that use this
+// function in their execution path.
+pub fn wait_timeout_sgx<F>(event_mask: u64, duration: crate::time::Duration, woken_up: F)
+where
+    F: Fn() -> bool,
+{
+    use self::abi::usercalls;
+    use crate::cmp;
+    use crate::io::ErrorKind;
+    use crate::time::{Duration, Instant};
+
+    // Calls the wait usercall and checks the result. Returns true if event was
+    // returned, and false if WouldBlock/TimedOut was returned.
+    // If duration is None, it will use WAIT_NO.
+    fn wait_checked(event_mask: u64, duration: Option<Duration>) -> bool {
+        let timeout = duration.map_or(usercalls::raw::WAIT_NO, |duration| {
+            cmp::min((u64::MAX - 1) as u128, duration.as_nanos()) as u64
+        });
+        match usercalls::wait(event_mask, timeout) {
+            Ok(eventset) => {
+                if event_mask == 0 {
+                    rtabort!("expected usercalls::wait() to return Err, found Ok.");
+                }
+                rtassert!(eventset & event_mask == event_mask);
+                true
+            }
+            Err(e) => {
+                rtassert!(e.kind() == ErrorKind::TimedOut || e.kind() == ErrorKind::WouldBlock);
+                false
+            }
+        }
+    }
+
+    match wait_checked(event_mask, Some(duration)) {
+        false => return,              // timed out
+        true if woken_up() => return, // woken up
+        true => {}                    // spurious event
+    }
+
+    // Drain all cached events.
+    // Note that `event_mask != 0` is implied if we get here.
+    loop {
+        match wait_checked(event_mask, None) {
+            false => break,               // no more cached events
+            true if woken_up() => return, // woken up
+            true => {}                    // spurious event
+        }
+    }
+
+    // Continue waiting, but take note of time spent waiting so we don't wait
+    // forever. We intentionally don't call `Instant::now()` before this point
+    // to avoid the cost of the `insecure_time` usercall in case there are no
+    // spurious wakeups.
+
+    let start = Instant::now();
+    let mut remaining = duration;
+    loop {
+        match wait_checked(event_mask, Some(remaining)) {
+            false => return,              // timed out
+            true if woken_up() => return, // woken up
+            true => {}                    // spurious event
+        }
+        remaining = match duration.checked_sub(start.elapsed()) {
+            Some(remaining) => remaining,
+            None => break,
+        }
+    }
+}
+
 // This enum is used as the storage for a bunch of types which can't actually
 // exist.
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
@@ -137,8 +214,8 @@ pub extern "C" fn __rust_abort() {
     abort_internal();
 }
 
-pub fn hashmap_random_keys() -> (u64, u64) {
-    fn rdrand64() -> u64 {
+pub mod rand {
+    pub fn rdrand64() -> u64 {
         unsafe {
             let mut ret: u64 = 0;
             for _ in 0..10 {
@@ -149,7 +226,10 @@ pub fn hashmap_random_keys() -> (u64, u64) {
             rtabort!("Failed to obtain random data");
         }
     }
-    (rdrand64(), rdrand64())
+}
+
+pub fn hashmap_random_keys() -> (u64, u64) {
+    (self::rand::rdrand64(), self::rand::rdrand64())
 }
 
 pub use crate::sys_common::{AsInner, FromInner, IntoInner};

src/libstd/sys/sgx/thread.rs

@@ -1,6 +1,8 @@
 #![cfg_attr(test, allow(dead_code))] // why is this necessary?
+
 use crate::ffi::CStr;
 use crate::io;
+use crate::sys::wait_timeout_sgx;
 use crate::time::Duration;
 
 use super::abi::usercalls;
@@ -73,8 +75,8 @@ impl Thread {
         // FIXME: could store this pointer in TLS somewhere
     }
 
-    pub fn sleep(_dur: Duration) {
-        rtabort!("can't sleep"); // FIXME
+    pub fn sleep(dur: Duration) {
+        wait_timeout_sgx(0, dur, || true);
     }
 
     pub fn join(self) {