Re: [PATCH] PCI/IOV: Make SR-IOV attributes with mode 0664 use 0644

[Greg KH]

On Thu, Sep 05, 2019 at 12:32:26AM -0600, Kelsey Skunberg wrote:
> sriov_numvfs and sriov_drivers_autoprobe have "unusual" permissions (0664)
> with no reported or found reason for allowing group write permissions.
> libvirt runs as root when dealing with PCI, and chowns files for qemu
> needs. There is not a need for the "0664" permissions.
> 
> sriov_numvfs was introduced in:
> 	commit 1789382a72a5 ("PCI: SRIOV control and status via sysfs")
> 
> sriov_drivers_autoprobe was introduced in:
> 	commit 0e7df22401a3 ("PCI: Add sysfs sriov_drivers_autoprobe to
> 			      control VF driver binding")
> 
> Change sriov_numvfs and sriov_drivers_autoprobe from "0664" permissions to
> "0644" permissions.
> 
> Exchange DEVICE_ATTR() with DEVICE_ATTR_RW() which sets the mode to "0644".
> DEVICE_ATTR() should only be used for "unusual" permissions.
> 
> Signed-off-by: Kelsey Skunberg <skunberg.kelsey@xxxxxxxxx>
> ---
>  drivers/pci/iov.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index b335db21c85e..b3f972e8cfed 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -375,12 +375,11 @@ static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
>  }
>  
>  static DEVICE_ATTR_RO(sriov_totalvfs);
> -static DEVICE_ATTR(sriov_numvfs, 0664, sriov_numvfs_show, sriov_numvfs_store);
> +static DEVICE_ATTR_RW(sriov_numvfs);
>  static DEVICE_ATTR_RO(sriov_offset);
>  static DEVICE_ATTR_RO(sriov_stride);
>  static DEVICE_ATTR_RO(sriov_vf_device);
> -static DEVICE_ATTR(sriov_drivers_autoprobe, 0664, sriov_drivers_autoprobe_show,
> -		   sriov_drivers_autoprobe_store);
> +static DEVICE_ATTR_RW(sriov_drivers_autoprobe);
>  
>  static struct attribute *sriov_dev_attrs[] = {
>  	&dev_attr_sriov_totalvfs.attr,


Nice!!!

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>