linux-kernel - Re: [PATCH v5 0/4] [SCSI] sg: fix race condition in sg

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Date:	Thu, 25 Jul 2013 23:32:04 +0800
From:	vaughan <vaughan.cao@...cle.com>
To:	JBottomley@...allels.com
CC:	Jörn Engel <joern@...fs.org>,
	dgilbert@...erlog.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, vaughan <vaughan.cao@...cle.com>
Subject: Re: [PATCH v5 0/4] [SCSI] sg: fix race condition in sg_open

On 07/23/2013 01:03 AM, Jörn Engel wrote:
> On Mon, 22 July 2013 12:40:29 +0800, Vaughan Cao wrote:
>> There is a race when open sg with O_EXCL flag. Also a race may happen between
>> sg_open and sg_remove.
>>
>> Changes from v4:
>>  * [3/4] use ERR_PTR series instead of adding another parameter in sg_add_sfp
>>  * [4/4] fix conflict for cherry-pick from v3.
>>
>> Changes from v3:
>>  * release o_sem in sg_release(), not in sg_remove_sfp().
>>  * not set exclude with sfd_lock held.
>>
>> Vaughan Cao (4):
>>   [SCSI] sg: use rwsem to solve race during exclusive open
>>   [SCSI] sg: no need sg_open_exclusive_lock
>>   [SCSI] sg: checking sdp->detached isn't protected when open
>>   [SCSI] sg: push file descriptor list locking down to per-device
>>     locking
>>
>>  drivers/scsi/sg.c | 178 +++++++++++++++++++++++++-----------------------------
>>  1 file changed, 83 insertions(+), 95 deletions(-)
> Patchset looks good to me, although I didn't test it on hardware yet.
> Signed-off-by: Joern Engel <joern@...fs.org>
>
> James, care to pick this up?
>
> Jörn
Hi James,

sg driver has two races happen in
 a) exclusive open and non-exclusive open
 b) sg removal and sg open
I explained the scenario detail in the separate patches. I did test
those patches and
Jörn has reviewed them.  I got no response from Doug Gilbert for a long
time.
Would you care to pick these up?

Thanks,
Vaughan

>
> --
> Good warriors cause others to come to them and do not go to others.
> -- Sun Tzu

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