Re: [PATCH] Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()"

[Steffen Maier]

On 6/17/20 12:34 PM, Greg Kroah-Hartman wrote:
> From: Wade Mealing <wmealing@xxxxxxxxxx>
>
> Turns out that the permissions for 0400 really are what we want here,
> otherwise any user can write to this file.

Minor confusion on my side:
Did you mean "read from" instead of "write to"?
I.e. only owner may read but not group nor others.
Whereas using CLASS_ATTR_RO would resolve into 0444.

> [fixed formatting and made static - gregkh]
>
> Reported-by: Wade Mealing <wmealing@xxxxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxx>
> ---
>   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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