netdev - Re: [PATCH net-next] sockopt: Make SO

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Message-ID: <5085BF0A.2030602@hp.com>
Date:	Mon, 22 Oct 2012 17:47:54 -0400
From:	Brian Haley <brian.haley@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Pavel Emelyanov <xemul@...allels.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next] sockopt: Make SO_BINDTODEVICE readable

On 10/22/2012 05:37 PM, Eric Dumazet wrote:
> On Mon, 2012-10-22 at 17:20 -0400, Brian Haley wrote:
> 
>> It's not much different from what's there:
>>
>> 	setsockopt("foo");
>>
>> 	rename foo -> bar
>>
>> 	index = getsockopt();
>> 	if_indextoname(index) -> "bar"
>>
>> I more raised the issue since you pass a 'char *' to setsockopt() but an 'int *'
>> to getsockopt(), I don't think any other value is non-symmetrical like this.
>>
>> -Brian
> 
> I meant another cpu can be changing dev->name[] content while the
> strcpy() is done, and you get a mangled devname, like "for" or "bao"
> instead of "foo" or "bar"

Even when holding the rcu_read_lock()?  I'd have to hold the rtnl lock there?

-Brian
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