linux-kernel - Re: KASAN: use-after-free Read in rds_tcp

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Date:   Wed, 14 Feb 2018 11:49:31 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+bbd8e9a06452cc48059b@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>, linux-rdma@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, rds-devel@....oracle.com,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in rds_tcp_tune

On Wed, Feb 14, 2018 at 10:35:55AM -0500, Sowmini Varadhan wrote:
> On (02/14/18 16:28), Dmitry Vyukov wrote:
> > syzbot is probably not seeing this problem. However if you don't add
> > the Reported-by tag to commit, nor provide syz fix tag, it will
> > consider it as "open". One consequence of this is that it is still on
> > our radars. Another consequence is that syzbot will never report bugs
> > in rds_tcp_tune ever again as it thinks that it's the same known bug,
> > so no point in bothering anybody.
> 
> understood, I think I saw this in the original syzbot mail as well,
> but I was hesitant to actually add the tag because the fix was
> based on code-inspection only, and I would have felt more comfortable
> about asserting the Reported-by if I'd done a clear-cut before/after
> verification.

I think the point is you have to clear it from syzbot to get it to
even test your patches, even if you are not totally sure your patch
fixes it?

Jason