linux-kernel - Re: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on sparc

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Message-Id: <20170112.153929.270105303415628819.davem@davemloft.net>
Date:   Thu, 12 Jan 2017 15:39:29 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     rob.gardner@...cle.com, shannon.nelson@...cle.com,
        netdev@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on
 sparc

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 12 Jan 2017 12:25:33 -0800

> On Thu, 2017-01-12 at 13:15 -0700, Rob Gardner wrote:
> 
>> 
>> I suspect that someplace, somebody is casting val to an int * or 
>> something like that.
> 
> Then that would be the bug. Can we root cause this please ?

The three accesses to foc->val are via function calls, at least when I
try to build it, one via memcmp(), one via memcpy() (for the structure
assignment at the end of the function) and one via a call into the
crypto layer when we do tcp_fastopen_cookie_gen).

So if the PC is inside of tcp_try_fastopen() it has to be something
else, or something specific to your gcc and build.