netdev - Re: [PATCH net] net: Fix undefined behavior in netdev name allocation

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Date: Mon, 13 Nov 2023 16:01:23 +0200
From: Gal Pressman <gal@...dia.com>
To: Simon Horman <horms@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, netdev@...r.kernel.org, Vlad Buslov <vladbu@...dia.com>
Subject: Re: [PATCH net] net: Fix undefined behavior in netdev name allocation

On 13/11/2023 11:53, Simon Horman wrote:
> On Mon, Nov 13, 2023 at 10:35:44AM +0200, Gal Pressman wrote:
>> Cited commit removed the strscpy() call and kept the snprintf() only.
>>
>> When allocating a netdev, 'res' and 'name' pointers are equal, but
>> according to POSIX, if copying takes place between objects that overlap
>> as a result of a call to sprintf() or snprintf(), the results are
>> undefined.
>>
>> Add back the strscpy() and use 'buf' as an intermediate buffer.
>>
>> Fixes: 9a810468126c ("net: reduce indentation of __dev_alloc_name()")
> 
> Hi Gal,
> 
> perhaps my eyes are deceiving me, but I wonder if this fixes the following:
> 
>   7ad17b04dc7b ("net: trust the bitmap in __dev_alloc_name()")

Thanks Simon, you're right.

Should I resubmit?