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From: Xianting TIan <>
To: Jassi Brar <>
Cc: Linux Kernel Mailing List <>,
Subject: Re: [PATCH] mailbox: fix a UAF bug in msg_submit()
Date: Tue, 17 Aug 2021 13:58:47 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

在 2021/8/17 下午12:29, Jassi Brar 写道:
> On Fri, Aug 6, 2021 at 7:15 AM Xianting Tian
> <> wrote:
>> We met a UAF issue during our mailbox testing.
>> In synchronous mailbox, we use mbox_send_message() to send a message
>> and wait for completion. mbox_send_message() calls msg_submit() to
>> send the message for the first time, if timeout, it will send the
>> message in tx_tick() for the second time.
> Seems like your controller's  .send_data() returns error. Can you
> please explain why it does so? Because
> send_data() only _accepts_ data for further transmission... which
> should seldom be a problem.

Thanks for the comments,

We developed virtio-mailbox for heterogeneous virtualization system.

virtio-mailbox is based on the mialbox framework.

In virtio framework, its send func 'virtqueue_add_outbuf()' may return 
error, which caused .send_data() return error.  And also contains other 

But I think mailbox framework shouldn't depend on .send_data() always 
return OK,  as .send_data() is implemented by mailbox hardware 
manufacturer, which is not controlled by mailbox framework itself.

You said 'seldom',  but it still possible we can meet such issue.  sucn 
as flexrm_send_data() of drivers/mailbox/bcm-flexrm-mailbox.c.

I think mailbox framework should be work normaly no matter .send_data() 
returns ok or not ok.  Do you think so? thanks

> thanks.

  parent reply	other threads:[~2021-08-17  5:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06 12:15 Xianting Tian
2021-08-10 10:45 ` Xianting TIan
2021-08-11  2:37 ` Guo Ren
2021-08-17  3:40   ` Xianting TIan
2021-08-17  4:29 ` Jassi Brar
2021-08-17  5:40   ` Xianting TIan
2021-08-17  5:58   ` Xianting TIan [this message]
2021-08-17  8:01     ` Xianting TIan
2021-08-17 23:33       ` Jassi Brar
2021-08-18  1:40         ` Xianting TIan

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