netdev - Re: [PATCH RESEND net] nfc: use GFP_USER for user-controlled kmalloc

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Message-ID: <CAGRGNgXSbo1ZjFda5qyg8cesddTSUO2=rMEsopzHDuVBpHJqaA@mail.gmail.com>
Date:	Wed, 27 Jan 2016 10:15:57 +1100
From:	Julian Calaby <julian.calaby@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH RESEND net] nfc: use GFP_USER for user-controlled kmalloc

Hi Cong,

On Wed, Jan 27, 2016 at 10:12 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Tue, Jan 26, 2016 at 2:55 PM, Julian Calaby <julian.calaby@...il.com> wrote:
>> Hi Cong,
>>
>> On Wed, Jan 27, 2016 at 4:53 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>>
>> A commit message would be nice. A brief rundown of how this is called
>> from userspace would be nice (I'm talking a single sentence here, e.g.
>> "this is allocated when submitting a nfc packet") and what issue
>> __GFP_NOWARN is fixing. (I'm guessing log spam due to allocation
>> failures.)
>>
>
> I thought it is obvious. ;) Keep in mind that $subject is one part of commit
> message too, so there is a commit message although very short.
>
> I will add it.

I know almost nothing about how the NFC subsystem works, and this
looks like a potential security issue, so more information is better
IMHO.

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/