linux-kernel - Re: [PATCH v2] Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR

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Date:   Thu, 18 Jun 2020 19:13:12 +0200
From:   Steffen Maier <maier@...ux.ibm.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wade Mealing <wmealing@...hat.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v2] Revert "zram: convert remaining CLASS_ATTR() to
 CLASS_ATTR_RO()"

On 6/17/20 1:49 PM, Greg Kroah-Hartman wrote:
> From: Wade Mealing <wmealing@...hat.com>
> 
> Turns out that the permissions for 0400 really are what we want here,
> otherwise any user can read from this file.
> 
> [fixed formatting, added changelog, and made attribute static - gregkh]
> 
> Reported-by: Wade Mealing <wmealing@...hat.com>
> Cc: stable <stable@...r.kernel.org>
> Fixes: f40609d1591f ("zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()")
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=1847832
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Steffen Maier <maier@...ux.ibm.com>

> ---
> v2: fix read/write confusion in the changelog, thanks to Steffen for the
>      review.
>      was more specific as to the changes I made to the original patch.
> 
>   drivers/block/zram/zram_drv.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 6e2ad90b17a3..270dd810be54 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -2021,7 +2021,8 @@ static ssize_t hot_add_show(struct class *class,
>   		return ret;
>   	return scnprintf(buf, PAGE_SIZE, "%d\n", ret);
>   }
> -static CLASS_ATTR_RO(hot_add);
> +static struct class_attribute class_attr_hot_add =
> +	__ATTR(hot_add, 0400, hot_add_show, NULL);
>   
>   static ssize_t hot_remove_store(struct class *class,
>   			struct class_attribute *attr,
> 


-- 
Mit freundlichen Gruessen / Kind regards
Steffen Maier

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