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treewide: Drop WARN_ON_FUNCTION_MISMATCH

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CONFIG_CFI_CLANG no longer breaks cross-module function address
equality, which makes WARN_ON_FUNCTION_MISMATCH unnecessary. Remove
the definition and switch back to WARN_ON_ONCE.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220908215504.3686827-15-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen 2022-09-08 14:54:56 -07:00 committed by Kees Cook
parent 607289a7cd
commit 4b24356312
3 changed files with 2 additions and 19 deletions
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16
include/asm-generic/bug.h
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@ -220,22 +220,6 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
# define WARN_ON_SMP(x) ({0;})
#endif
/*
* WARN_ON_FUNCTION_MISMATCH() warns if a value doesn't match a
* function address, and can be useful for catching issues with
* callback functions, for example.
*
* With CONFIG_CFI_CLANG, the warning is disabled because the
* compiler replaces function addresses taken in C code with
* local jump table addresses, which breaks cross-module function
* address equality.
*/
#if defined(CONFIG_CFI_CLANG) && defined(CONFIG_MODULES)
# define WARN_ON_FUNCTION_MISMATCH(x, fn) ({ 0; })
#else
# define WARN_ON_FUNCTION_MISMATCH(x, fn) WARN_ON_ONCE((x) != (fn))
#endif
#endif /* __ASSEMBLY__ */
#endif

3
kernel/kthread.c
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@ -1050,8 +1050,7 @@ static void __kthread_queue_delayed_work(struct kthread_worker *worker,
struct timer_list *timer = &dwork->timer;
struct kthread_work *work = &dwork->work;
WARN_ON_FUNCTION_MISMATCH(timer->function,
kthread_delayed_work_timer_fn);
WARN_ON_ONCE(timer->function != kthread_delayed_work_timer_fn);
/*
* If @delay is 0, queue @dwork->work immediately. This is for

2
kernel/workqueue.c
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@ -1651,7 +1651,7 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
struct work_struct *work = &dwork->work;
WARN_ON_ONCE(!wq);
WARN_ON_FUNCTION_MISMATCH(timer->function, delayed_work_timer_fn);
WARN_ON_ONCE(timer->function != delayed_work_timer_fn);
WARN_ON_ONCE(timer_pending(timer));
WARN_ON_ONCE(!list_empty(&work->entry));