Re: [PATCH] kasan: make report_lock a raw spinlock

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Tue, 19 Nov 2024 13:02:34 -0800 Jared Kangas <jkangas@xxxxxxxxxx> wrote:

> If PREEMPT_RT is enabled, report_lock is a sleeping spinlock and must
> not be locked when IRQs are disabled. However, KASAN reports may be
> triggered in such contexts. For example:
> 
>         char *s = kzalloc(1, GFP_KERNEL);
>         kfree(s);
>         local_irq_disable();
>         char c = *s;  /* KASAN report here leads to spin_lock() */
>         local_irq_enable();
> 
> Make report_spinlock a raw spinlock to prevent rescheduling when
> PREEMPT_RT is enabled.

So I assume we want this backported into 6.12.x?

If so, please help us identify a suitable Fixes: commit.