08d45ee84b
This allows replacements of the idioms "var += offset" and "var -= offset" with the wrapping_assign_add() and wrapping_assign_sub() helpers respectively. They will avoid wrap-around sanitizer instrumentation. Add to the selftests to validate behavior and lack of side-effects. Reviewed-by: Marco Elver <elver@google.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Kees Cook <keescook@chromium.org>