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kthread: use WARN_ON_FUNCTION_MISMATCH

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With CONFIG_CFI_CLANG, a callback function passed to
__kthread_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 != ktead_delayed_work_timer_fn);

Use WARN_ON_FUNCTION_MISMATCH() instead to disable the warning
when CFI and modules are both enabled.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210408182843.1754385-7-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen 2021-04-08 11:28:31 -07:00 committed by Kees Cook
parent 981731129e
commit 0a5b412891
1 changed files with 2 additions and 1 deletions
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3
kernel/kthread.c
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@ -963,7 +963,8 @@ static void __kthread_queue_delayed_work(struct kthread_worker *worker,
struct timer_list *timer = &dwork->timer;
struct kthread_work *work = &dwork->work;
WARN_ON_ONCE(timer->function != kthread_delayed_work_timer_fn);
WARN_ON_FUNCTION_MISMATCH(timer->function,
kthread_delayed_work_timer_fn);
/*
* If @delay is 0, queue @dwork->work immediately. This is for