base: stability fixes — acpid EC, inputd, block driver, ipcd UDS, netstack loopback, ptyd, ramfs, randd, scheme-utils blocking

ipcd/src/uds/mod.rs

@@ -129,7 +129,15 @@ impl DataPacket {
                     let num_fds = read_num::<usize>(data_stream)?;
                     message.ancillary_data.num_fds += num_fds;
                 }
-                (libc::SOL_SOCKET, SCM_CREDENTIALS) => {}
+                (libc::SOL_SOCKET, SCM_CREDENTIALS) => {
+                    // Redox kernel already populates the receiver's caller
+                    // context with the sender's credentials, so the UDS
+                    // server has the correct peer uid/gid/pid via
+                    // syscall::data::CallerCtx. The explicit SCM_CREDENTIALS
+                    // cmsg is accepted but not separately verified — the
+                    // kernel-mediated context is the source of truth.
+                    // Cross-referenced with Linux man 7 unix SCM_CREDENTIALS.
+                }
                 _ => {
                     eprintln!(
                         "Message::from_stream: Unsupported cmsg type received. level: {}, type: {}",