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From:   Munehisa Kamata <kamatam@amazon.com>
To:     <surenb@google.com>
CC:     <ebiggers@kernel.org>, <hannes@cmpxchg.org>, <hdanton@sina.com>,
        <kamatam@amazon.com>, <linux-kernel@vger.kernel.org>,
        <linux-mm@kvack.org>, <mengcc@amazon.com>, <tj@kernel.org>
Subject: Re: another use-after-free in ep_remove_wait_queue()
Date:   Thu, 19 Jan 2023 17:45:07 -0800
Message-ID: <20230120014507.827289-1-kamatam@amazon.com>
In-Reply-To: <CAJuCfpFZ3B4530TgsSHqp5F_gwfrDujwRYewKReJru==MdEHQg@mail.gmail.com>
References: <CAJuCfpFZ3B4530TgsSHqp5F_gwfrDujwRYewKReJru==MdEHQg@mail.gmail.com>
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On Thu, 2023-01-19 21:01:42 +0000, Suren Baghdasaryan <surenb@google.com> wrote:
>
> Munehisha, if Tejun confirms this is all valid, could you please post
> a patch replacing wake_up_interruptible() with wake_up_pollfree()? We
> don't need to worry about wake_up_all() because we have a limitation
> of one trigger per file descriptor:
> https://elixir.bootlin.com/linux/latest/source/kernel/sched/psi.c#L1419,
> so there can be only one waiter.

Yes, will do (and will CC stable).


Regards,
Munehisa