--zero-fill-buffers 命令行选项

如果没有该选项，则使用 Buffer.allocUnsafe()、Buffer.allocUnsafeSlow() 和 new SlowBuffer(size) 创建的缓冲区不会填零。 使用此标志会对性能产生可衡量的负面影响。 仅在必要时使用 --zero-fill-buffers 选项以强制新分配的 Buffer 实例不能包含可能敏感的旧数据。

$ node --zero-fill-buffers
> Buffer.allocUnsafe(5);
<Buffer 00 00 00 00 00>

Node.js can be started using the --zero-fill-buffers command line option to cause all newly-allocated Buffer instances to be zero-filled upon creation by default. Without the option, buffers created with Buffer.allocUnsafe(), Buffer.allocUnsafeSlow(), and new SlowBuffer(size) are not zero-filled. Use of this flag can have a measurable negative impact on performance. Use the --zero-fill-buffers option only when necessary to enforce that newly allocated Buffer instances cannot contain old data that is potentially sensitive.

$ node --zero-fill-buffers
> Buffer.allocUnsafe(5);
<Buffer 00 00 00 00 00>