linux-kernel - Re: ipv4: Use standard iovec primitive in raw_probe_proto

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Message-ID: <20141106064629.GA29321@gondor.apana.org.au>
Date:	Thu, 6 Nov 2014 14:46:29 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bcrl@...ck.org,
	Masahide Nakamura <nakam@...ux-ipv6.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: ipv4: Use standard iovec primitive in raw_probe_proto_opt

On Thu, Nov 06, 2014 at 06:43:18AM +0000, Al Viro wrote:
> On Thu, Nov 06, 2014 at 01:50:23PM +0800, Herbert Xu wrote:
> > +	/* We only need the first two bytes. */
> > +	err = memcpy_fromiovecend((void *)&icmph, msg->msg_iov, 0, 2);
> > +	if (err)
> > +		return err;
> > +
> > +	fl4->fl4_icmp_type = icmph.type;
> > +	fl4->fl4_icmp_code = icmph.code;
> 
> That's more readable, but that exposes another problem in there - we read
> the same piece of userland data twice, with no promise whatsoever that we'll
> get the same value both times...

Sure, but you have to be root anyway to write to raw sockets.

Patches are welcome :)

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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