linux-kernel - Re: [PATCH v1] staging: lustre: libcfs: add __user annotation in libcfs_ioctl

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Date:	Sun, 31 May 2015 11:27:44 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	David Decotigny <ddecotig@...il.com>
Cc:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	HPDD-discuss@...ts.01.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org,
	Doug Oucharek <doug.s.oucharek@...el.com>,
	Peng Tao <bergwolf@...il.com>,
	Isaac Huang <he.huang@...el.com>,
	Amir Shehata <amir.shehata@...el.com>,
	Liang Zhen <liang.zhen@...el.com>
Subject: Re: [PATCH v1] staging: lustre: libcfs: add __user annotation in
 libcfs_ioctl_data

On Mon, May 25, 2015 at 09:40:04PM -0700, David Decotigny wrote:
> This fixes the following sparse warnings:
>    drivers/staging/lustre/lnet/lnet/api-ni.c:1926:38: warning: incorrect type in argument 1 (different address spaces)
>    drivers/staging/lustre/lnet/lnet/api-ni.c:1926:38:    expected void [noderef] <asn:1>*to
>    drivers/staging/lustre/lnet/lnet/api-ni.c:1926:38:    got struct lnet_process_id_t [usertype] *
>    drivers/staging/lustre/lnet/selftest/conctl.c:833:37: warning: incorrect type in argument 2 (different address spaces)
>    drivers/staging/lustre/lnet/selftest/conctl.c:833:37:    expected void const [noderef] <asn:1>*from
>    drivers/staging/lustre/lnet/selftest/conctl.c:833:37:    got char *ioc_pbuf1
>    drivers/staging/lustre/lnet/selftest/conctl.c:918:30: warning: incorrect type in argument 1 (different address spaces)
>    drivers/staging/lustre/lnet/selftest/conctl.c:918:30:    expected void [noderef] <asn:1>*to
>    drivers/staging/lustre/lnet/selftest/conctl.c:918:30:    got char *ioc_pbuf2
> 
> Signed-off-by: David Decotigny <ddecotig@...il.com>
> ---
>  drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h | 4 ++--
>  drivers/staging/lustre/include/linux/lnet/lib-lnet.h       | 2 +-
>  drivers/staging/lustre/lnet/lnet/api-ni.c                  | 5 +++--
>  3 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
> index 3ee3878..aa687b7 100644
> --- a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
> +++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
> @@ -61,9 +61,9 @@ struct libcfs_ioctl_data {
>  	char *ioc_inlbuf2;
>  
>  	__u32 ioc_plen1; /* buffers in userspace */
> -	char *ioc_pbuf1;
> +	char __user *ioc_pbuf1;
>  	__u32 ioc_plen2; /* buffers in userspace */
> -	char *ioc_pbuf2;
> +	char __user *ioc_pbuf2;
>  
>  	char ioc_bulk[0];
>  };
> diff --git a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
> index 0038d29..7f06b9f7 100644
> --- a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
> +++ b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
> @@ -858,7 +858,7 @@ void lnet_swap_pinginfo(lnet_ping_info_t *info);
>  int lnet_ping_target_init(void);
>  void lnet_ping_target_fini(void);
>  int lnet_ping(lnet_process_id_t id, int timeout_ms,
> -	      lnet_process_id_t *ids, int n_ids);
> +	      lnet_process_id_t __user *ids, int n_ids);
>  
>  int lnet_parse_ip2nets(char **networksp, char *ip2nets);
>  int lnet_parse_routes(char *route_str, int *im_a_router);
> diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c
> index 4a14e51..1a0cd57 100644
> --- a/drivers/staging/lustre/lnet/lnet/api-ni.c
> +++ b/drivers/staging/lustre/lnet/lnet/api-ni.c
> @@ -1470,7 +1470,7 @@ LNetCtl(unsigned int cmd, void *arg)
>  		id.nid = data->ioc_nid;
>  		id.pid = data->ioc_u32[0];
>  		rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
> -			       (lnet_process_id_t *)data->ioc_pbuf1,
> +			       (lnet_process_id_t __user *)data->ioc_pbuf1,

Why is this marking needed?  If so, something must be wrong as isn't
this variable already __user now due to the other part of this patch?

thanks,

greg k-h
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