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I don’t follow. It’s exactly like C in this regard, except with Box::new instead of malloc.

The key difference as outlined in the article is that Box::new cannot fail in Rust, but the underlying malloc can.

In userspace it is rare enough that a Rust panic is considered acceptable behavior, but this is not the case for the kernel.

But, it is controllable for sure

Unsurprisingly the kernel's Box does not have Box::new it provides instead Box::try_new which is fallible.