linux-kernel - RE: [PATCH 3/3] secure_seq: use fast&secure siphash instead of slow&insecure md5

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Date:   Wed, 14 Dec 2016 09:51:16 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'Jason A. Donenfeld'" <Jason@...c4.com>,
        Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>,
        George Spelvin <linux@...izon.com>,
        Scott Bauer <sbauer@....utah.edu>,
        "Andi Kleen" <ak@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Eric Biggers <ebiggers3@...il.com>
Subject: RE: [PATCH 3/3] secure_seq: use fast&secure siphash instead of
 slow&insecure md5

From: Jason A. Donenfeld
> Sent: 14 December 2016 00:17
> This gives a clear speed and security improvement. Rather than manually
> filling MD5 buffers, we simply create a layout by a simple anonymous
> struct, for which gcc generates rather efficient code.
...
> +	const struct {
> +		struct in6_addr saddr;
> +		struct in6_addr daddr;
> +		__be16 sport;
> +		__be16 dport;
> +	} __packed combined = {
> +		.saddr = *(struct in6_addr *)saddr,
> +		.daddr = *(struct in6_addr *)daddr,
> +		.sport = sport,
> +		.dport = dport
> +	};

You need to look at the effect of marking this (and the other)
structures 'packed' on architectures like sparc64.

	David