[libos] Fix gvisor setsockopt/getsockopt bugs

src/libos/src/net/socket/sockopt/get.rs

@@ -35,7 +35,8 @@ impl GetSockOptRawCmd {
     }
 
     pub fn output(&self) -> Option<&[u8]> {
-        self.optlen.map(|_| self.optval.as_ref())
+        self.optlen
+            .map(|opt_len| &self.optval[..(opt_len as usize)])
     }
 }
 

src/libos/src/net/socket/sockopt/set.rs

@@ -5,12 +5,11 @@ use libc::ocall::setsockopt as do_setsockopt;
 pub struct SetSockOptRawCmd {
     level: i32,
     optname: i32,
-    optval: Box<[u8]>,
+    optval: &'static [u8],
 }
 
 impl SetSockOptRawCmd {
-    pub fn new(level: i32, optname: i32, optval: &[u8]) -> Self {
-        let optval = Box::from(optval);
+    pub fn new(level: i32, optname: i32, optval: &'static [u8]) -> Self {
         Self {
             level,
             optname,

src/libos/src/net/syscalls.rs

@@ -274,10 +274,6 @@ pub fn do_setsockopt(
     );
     let file_ref = current!().file(fd as FileDesc)?;
 
-    if optval as usize != 0 && optlen == 0 && ENABLE_URING.load(Ordering::Relaxed) {
-        return_errno!(EINVAL, "the optlen size is 0");
-    }
-
     let optval = from_user::make_slice(optval as *const u8, optlen as usize)?;
 
     if let Ok(host_socket) = file_ref.as_host_socket() {
@@ -1132,7 +1128,11 @@ fn new_uring_getsockopt_cmd(
 }
 
 /// Create a new ioctl command for host socket setsockopt syscall
-fn new_host_setsockopt_cmd(level: i32, optname: i32, optval: &[u8]) -> Result<Box<dyn IoctlCmd>> {
+fn new_host_setsockopt_cmd(
+    level: i32,
+    optname: i32,
+    optval: &'static [u8],
+) -> Result<Box<dyn IoctlCmd>> {
     if level != libc::SOL_SOCKET {
         return Ok(Box::new(SetSockOptRawCmd::new(level, optname, optval)));
     }
@@ -1162,7 +1162,7 @@ fn new_host_setsockopt_cmd(level: i32, optname: i32, optval: &[u8]) -> Result<Bo
 fn new_uring_setsockopt_cmd(
     level: i32,
     optname: i32,
-    optval: &[u8],
+    optval: &'static [u8],
     socket_type: Type,
 ) -> Result<Box<dyn IoctlCmd>> {
     if level != libc::SOL_SOCKET {