On Fri, Apr 26, 2024 at 08:40:50AM +0100, David Howells wrote:

Kees Cook [off-list ref] wrote:

quoted

-	return i + xadd(&v->counter, i);
+	return wrapping_add(int, i, xadd(&v->counter, i));

Ewww.  Can't you just mark the variable as wrapping in some way, either by:

	unsigned int __cyclic counter;

Yeah, that's the plan now. Justin is currently working on the "wraps"
attribute for Clang:
https://github.com/llvm/llvm-project/pull/86618

-- 
Kees Cook