linux-kernel - Re: [syzbot] general protection fault in __device

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Date:   Mon, 6 Jun 2022 15:38:39 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        syzbot <syzbot+dd3c97de244683533381@...kaller.appspotmail.com>,
        hdanton@...a.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com,
        rafael@...nel.org, rjw@...ysocki.net,
        syzkaller-bugs@...glegroups.com, linux-usb@...r.kernel.org
Subject: Re: [syzbot] general protection fault in __device_attach

On Sat, Jun 04, 2022 at 10:32:46AM +0200, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Fri, 3 Jun 2022 at 18:12, Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > But again, is this a "real and able to be triggered from userspace"
> > problem, or just fault-injection-induced?
> 
> Then this is something to fix in the fault injection subsystem.
> Testing systems shouldn't be reporting false positives.
> What allocations cannot fail in real life? Is it <=page_size?
> 

Apparently in 2014, anything less than *EIGHT?!!* pages succeeded!

https://lwn.net/Articles/627419/

I have been on the look out since that article and never seen anyone
mention it changing.  I think we should ignore that and say that
anything over PAGE_SIZE can fail.  Possibly we could go smaller than
PAGE_SIZE...

regards,
dan carpenter