vmm: config: Add DiskConfig check for device serial length

Signed-off-by: Jinrong Liang <cloudliang@tencent.com>

vmm/src/config.rs

@@ -14,6 +14,7 @@ use option_parser::{
 };
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
+use virtio_bindings::virtio_blk::VIRTIO_BLK_ID_BYTES;
 use virtio_devices::block::MINIMUM_BLOCK_QUEUE_SIZE;
 use virtio_devices::{RateLimiterConfig, TokenBucketConfig};
 
@@ -221,6 +222,8 @@ pub enum ValidationError {
     LandlockPathDoesNotExist(PathBuf),
     /// Access provided in landlock-rules in invalid
     InvalidLandlockAccess(String),
+    /// Invalid block device serial length
+    InvalidSerialLength(usize, usize),
 }
 
 type ValidationResult<T> = std::result::Result<T, ValidationError>;
@@ -391,6 +394,12 @@ impl fmt::Display for ValidationError {
             InvalidLandlockAccess(s) => {
                 write!(f, "{s}")
             }
+            InvalidSerialLength(actual, max) => {
+                write!(
+                    f,
+                    "Block device serial length ({actual}) exceeds maximum allowed length ({max})"
+                )
+            }
         }
     }
 }
@@ -1358,6 +1367,16 @@ impl DiskConfig {
             return Err(ValidationError::InvalidRateLimiterGroup);
         }
 
+        // Check Block device serial length
+        if let Some(ref serial) = self.serial {
+            if serial.len() > VIRTIO_BLK_ID_BYTES as usize {
+                return Err(ValidationError::InvalidSerialLength(
+                    serial.len(),
+                    VIRTIO_BLK_ID_BYTES as usize,
+                ));
+            }
+        }
+
         Ok(())
     }
 }