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Re: [PATCH v2 net] nfc: use GFP_USER for user-controlled kmalloc

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Hi Cong

On Sat, Jan 30, 2016 at 6:46 AM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> On Fri, 2016-01-29 at 11:24 -0800, Cong Wang wrote:
>> These two functions are called in sendmsg path, and the
>> 'len' is passed from user-space, so we should not allow
>> malicious users to OOM kernel on purpose.
>>
>> Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
>> Cc: Lauro Ramos Venancio <lauro.venancio@xxxxxxxxxxxxx>
>> Cc: Aloisio Almeida Jr <aloisio.almeida@xxxxxxxxxxxxx>
>> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
>> Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
>> ---
>
> Note that the issue is not OOM the kernel (as the allocation is
> attempted even after your patch), but having a way to
> spill stack traces in the syslog.
>
> Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>

Reviewed-by: Julian Calaby <julian.calaby@xxxxxxxxx>

Thanks,

-- 
Julian Calaby

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