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

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Message-ID: <20190905191637.GA22813@JATN>
Date:   Thu, 5 Sep 2019 13:16:37 -0600
From:   Kelsey Skunberg <skunberg.kelsey@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, bodong@...lanox.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        skhan@...uxfoundation.org, ddutile@...hat.com, berrange@...hat.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH] PCI/IOV: Make SR-IOV attributes with mode 0664 use 0644

On Thu, Sep 05, 2019 at 09:34:16AM +0200, Greg KH wrote:
> 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@...il.com>
> > ---
> >  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@...uxfoundation.org>

Thank you for reviewing!

-Kelsey