linux-kernel - Re: [PATCH] NSM: Fix unaligned accesses in nsm_init

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Message-Id: <56E66BF1-FBC8-4727-AB62-3BF2A97979F1@oracle.com>
Date:	Mon, 30 Mar 2009 15:40:49 -0400
From:	Chuck Lever <chuck.lever@...cle.com>
To:	Mans Rullgard <mans@...sr.com>
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH] NSM: Fix unaligned accesses in nsm_init_private()

On Mar 28, 2009, at 3:55 PM, Mans Rullgard wrote:
> This fixes unaligned accesses in nsm_init_private() when
> creating nlm_reboot keys.
>

Reviewed-by: Chuck Lever <chuck.lever@...cle.com>

Did a little testing on x86 as well.

> Signed-off-by: Mans Rullgard <mans@...sr.com>
> ---
> fs/lockd/mon.c |    8 ++++++--
> 1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
> index 5e2c4d5..6d5d4a4 100644
> --- a/fs/lockd/mon.c
> +++ b/fs/lockd/mon.c
> @@ -16,6 +16,8 @@
> #include <linux/sunrpc/svc.h>
> #include <linux/lockd/lockd.h>
>
> +#include <asm/unaligned.h>
> +
> #define NLMDBG_FACILITY		NLMDBG_MONITOR
> #define NSM_PROGRAM		100024
> #define NSM_VERSION		1
> @@ -274,10 +276,12 @@ static void nsm_init_private(struct nsm_handle  
> *nsm)
> {
> 	u64 *p = (u64 *)&nsm->sm_priv.data;
> 	struct timespec ts;
> +	s64 ns;
>
> 	ktime_get_ts(&ts);
> -	*p++ = timespec_to_ns(&ts);
> -	*p = (unsigned long)nsm;
> +	ns = timespec_to_ns(&ts);
> +	put_unaligned(ns, p);
> +	put_unaligned((unsigned long)nsm, p + 1);
> }
>
> static struct nsm_handle *nsm_create_handle(const struct sockaddr  
> *sap,
> -- 
> 1.6.2
>
> --
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--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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