From: Andrew Morton <akpm@linux-foundation.org>
To: Jared Kangas <jkangas@redhat.com>
Cc: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com,
dvyukov@google.com, vincenzo.frascino@arm.com,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kasan: make report_lock a raw spinlock
Date: Thu, 21 Nov 2024 22:28:09 -0800 [thread overview]
Message-ID: <20241121222809.4b53e070a943e100bb6f7ba0@linux-foundation.org> (raw)
In-Reply-To: <20241119210234.1602529-1-jkangas@redhat.com>
On Tue, 19 Nov 2024 13:02:34 -0800 Jared Kangas <jkangas@redhat.com> 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.
next prev parent reply other threads:[~2024-11-22 6:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-19 21:02 Jared Kangas
2024-11-22 6:28 ` Andrew Morton [this message]
2024-11-22 18:03 ` Jared Kangas
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