[medium] [runtime] integer overflow in runtime/src/storage/iouring.rs

[dnkolegov-ar]

runtime/src/storage/iouring.rs derives per-operation offsets with unchecked u64 arithmetic. If a caller can supply an offset near u64::MAX, these additions can wrap on subsequent loop iterations (short read/write), redirecting I/O to unintended earlier positions:

• let offset = offset + bytes_read as u64; [1]

• offset += op_bytes_written as u64; in single-buffer write (runtime/src/storage/iouring.rs:324) [2]

• offset += op_bytes_written as u64; in vectored write [3]