On Thu, Mar 11, 2021 at 04:49:07PM -0800, Sami Tolvanen wrote:

With CONFIG_CFI_CLANG, a callback function passed to
__queue_delayed_work from a module points to a jump table entry
defined in the module instead of the one used in the core kernel,
which breaks function address equality in this check:

  WARN_ON_ONCE(timer->function != delayed_work_timer_fn);

Disable the warning when CFI and modules are enabled.

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook