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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: LinMa <3160105373@zju.edu.cn>
Cc: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	Johan Hedberg <johan.hedberg@gmail.com>,
	Marcel Holtmann <marcel@holtmann.org>,
	"linux-bluetooth@vger.kernel.org"
	<linux-bluetooth@vger.kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	"open list:NETWORKING [GENERAL]" <netdev@vger.kernel.org>
Subject: Re: [PATCH v3] Bluetooth: call lock_sock() outside of spinlock section
Date: Thu, 22 Jul 2021 18:36:58 +0900	[thread overview]
Message-ID: <d9ceb087-588f-a023-9f0c-c0ab46b6af87@i-love.sakura.ne.jp> (raw)
In-Reply-To: <4bd89382.4d087.17aafed62b1.Coremail.3160105373@zju.edu.cn>

On 2021/07/17 0:26, LinMa wrote:
> Hello everyone,
> 
> Sorry, it's my fault to cause the misunderstanding.
> 
> As I keep mentioning "hci_sock_sendmsg()" instead of "hci_sock_bound_ioctl()". In fact,
> both these two functions are able to cause the race.

I sent two patches for avoiding page fault with kernel lock held.

  [PATCH v2] Bluetooth: reorganize ioctls from hci_sock_bound_ioctl()
  https://lkml.kernel.org/r/39b677ce-dcbf-6393-6279-88ed3a9e570e@i-love.sakura.ne.jp

  [PATCH] Bluetooth: reorganize functions from hci_sock_sendmsg()
  https://lkml.kernel.org/r/20210722074208.8040-1-penguin-kernel@I-love.SAKURA.ne.jp

These two patches will eliminate user-controlled delay at lock_sock() which

  [PATCH v3] Bluetooth: call lock_sock() outside of spinlock section
  https://lkml.kernel.org/r/48d66166-4d39-4fe2-3392-7e0c84b9bdb3@i-love.sakura.ne.jp

would suffer.

Are you aware of more locations which trigger page fault with sock lock held?
If none, we can send these three patches together.

If we are absolutely sure that there is no more locations, we could try choice (1) or (2)
at https://lkml.kernel.org/r/05535d35-30d6-28b6-067e-272d01679d24@i-love.sakura.ne.jp .

  parent reply	other threads:[~2021-07-22  9:37 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-27 13:11 [PATCH] " Tetsuo Handa
2021-06-27 14:05 ` bluez.test.bot
2021-07-07  9:43 ` [PATCH v2] " Tetsuo Handa
2021-07-07 10:08   ` [v2] " bluez.test.bot
2021-07-07 18:20   ` [PATCH v2] " Luiz Augusto von Dentz
2021-07-07 23:33     ` Tetsuo Handa
2021-07-08  1:00       ` LinMa
2021-07-09 13:50         ` Tetsuo Handa
2021-07-10 13:34       ` Tetsuo Handa
2021-07-08  7:16   ` [v2] " bluez.test.bot
2021-07-13 11:27   ` [PATCH v3] " Tetsuo Handa
2021-07-13 11:57     ` [v3] " bluez.test.bot
2021-07-14 19:20     ` [PATCH v3] " Luiz Augusto von Dentz
2021-07-15  3:03       ` LinMa
2021-07-16  3:47         ` Desmond Cheong Zhi Xi
2021-07-16  4:11           ` Desmond Cheong Zhi Xi
2021-07-16 14:48             ` Tetsuo Handa
2021-07-16 15:26               ` LinMa
2021-07-17 15:41                 ` Yet Another Patch for CVE-2021-3573 LinMa
2021-07-17 15:45                   ` LinMa
2021-07-22  9:36                 ` Tetsuo Handa [this message]
2021-07-22  4:47               ` Re: [PATCH v3] Bluetooth: call lock_sock() outside of spinlock section LinMa
2021-07-22  5:16                 ` Tetsuo Handa

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