linux-kernel - Re: [PATCH v2 3/7] vhost: Add kthread support in function vhost_workers

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Message-ID: <CACLfguVB0Xn2vsj6kJB9ONv1AhpcUteH9PEqDaPX-7JkxxqvKQ@mail.gmail.com>
Date: Tue, 15 Oct 2024 14:05:47 +0800
From: Cindy Lu <lulu@...hat.com>
To: Mike Christie <michael.christie@...cle.com>
Cc: jasowang@...hat.com, mst@...hat.com, linux-kernel@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 3/7] vhost: Add kthread support in function vhost_workers_free()

On Tue, 15 Oct 2024 at 05:06, Mike Christie <michael.christie@...cle.com> wrote:
>
> On 10/3/24 8:58 PM, Cindy Lu wrote:
> > +static void vhost_workers_free(struct vhost_dev *dev)
> > +{
> > +     if (enforce_inherit_owner)
> > +             vhost_workers_free_task(dev);
> > +     else
> > +             vhost_workers_free_kthread(dev);
> > +}
>
> With patch 7, userspace could change enforce_inherit_owner after
> we created thread and we would call the wrong function above.
>
enforce_inherit_owner will only change before the owner was set.
the process is like set enforce_inherit_owner---->set owner->
thread/task creating
in in patch 7's code I have add the check for vhost's owner, if the
owner was set, the ioctl
to set enforce_inherit_owner will fail
Thanks
Cindy