fix (and ignore in tests) clippy lints...

...and add missing copyrights

Signed-off-by: Alexandra Iordache <aghecen@amazon.com>

Author: Alexandra Iordache

src/backend/condition.rs

@@ -299,6 +299,7 @@ impl SeccompCondition {
 }
 
 #[cfg(test)]
+#[allow(clippy::undocumented_unsafe_blocks)]
 mod tests {
     use super::*;
     #[test]

src/backend/rule.rs

@@ -115,7 +115,7 @@ impl From<SeccompRule> for BpfProgram {
                 // If the nr of statements ever overflows `usize`, the rust vector allocation would
                 // anyway fail.
                 .checked_mul(CONDITION_MAX_LEN as usize)
-                .unwrap() as usize,
+                .unwrap(),
         );
         let mut offset = 1;
 

src/lib.rs

@@ -297,6 +297,7 @@ pub fn apply_filter(bpf_filter: BpfProgramRef) -> Result<()> {
         return Err(Error::EmptyFilter);
     }
 
+    // SAFETY:
     // Safe because syscall arguments are valid.
     let rc = unsafe { libc::prctl(libc::PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) };
     if rc != 0 {
@@ -309,6 +310,7 @@ pub fn apply_filter(bpf_filter: BpfProgramRef) -> Result<()> {
     };
     let bpf_prog_ptr = &bpf_prog as *const sock_fprog;
 
+    // SAFETY:
     // Safe because the kernel performs a `copy_from_user` on the filter and leaves the memory
     // untouched. We can therefore use a reference to the BpfProgram, without needing ownership.
     let rc = unsafe {

tests/integration_tests.rs

@@ -1,3 +1,8 @@
+// Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
+
+#![allow(clippy::undocumented_unsafe_blocks)]
+
 use std::collections::BTreeMap;
 
 use seccompiler::SeccompCmpArgLen::*;

tests/json.rs

@@ -1,4 +1,8 @@
+// Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
+
 #![cfg(feature = "json")]
+#![allow(clippy::undocumented_unsafe_blocks)]
 
 use seccompiler::{apply_filter, compile_from_json, BpfProgram};
 use std::convert::TryInto;