linux-kernel - RE: [Xen-devel] [PATCH 29/29] drivers, xen: convert grant_map.users from atomic_t to refcount

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Message-ID: <2236FBA76BA1254E88B949DDB74E612B41C56177@IRSMSX102.ger.corp.intel.com>
Date:   Wed, 8 Mar 2017 13:49:32 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "peterz@...radead.org" <peterz@...radead.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "linux1394-devel@...ts.sourceforge.net" 
        <linux1394-devel@...ts.sourceforge.net>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "fcoe-devel@...n-fcoe.org" <fcoe-devel@...n-fcoe.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "open-iscsi@...glegroups.com" <open-iscsi@...glegroups.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
        "linux-bcache@...r.kernel.org" <linux-bcache@...r.kernel.org>,
        "Hans Liljestrand" <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        Juergen Gross <jgross@...e.com>
Subject: RE: [Xen-devel] [PATCH 29/29] drivers, xen: convert grant_map.users
 from atomic_t to refcount_t


> On 03/06/2017 09:21 AM, Elena Reshetova wrote:
> > refcount_t type and corresponding API should be
> > used instead of atomic_t when the variable is used as
> > a reference counter. This allows to avoid accidental
> > refcounter overflows that might lead to use-after-free
> > situations.
> >
> > Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> > Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > Signed-off-by: David Windsor <dwindsor@...il.com>
> > ---
> >  drivers/xen/gntdev.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

Is there a tree that can take this change? Turns out it is better to propagate changes via separate trees and only leftovers can be taken via Greg's tree.  

Best Regards,
Elena.