linux-kernel - RE: [PATCH 0/2] fs, ceph filesystem refcount conversions

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Date:   Thu, 20 Apr 2017 10:28:22 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Ilya Dryomov <idryomov@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Ceph Development" <ceph-devel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>
Subject: RE: [PATCH 0/2] fs, ceph filesystem refcount conversions



> On Thu, Apr 20, 2017 at 9:40 AM, Reshetova, Elena
> <elena.reshetova@...el.com> wrote:
> >
> >> On Fri, Mar 3, 2017 at 10:15 AM, Elena Reshetova
> >> <elena.reshetova@...el.com> wrote:
> >> > Now when new refcount_t type and API are finally merged
> >> > (see include/linux/refcount.h), the following
> >> > patches convert various refcounters in the ceph filesystem from atomic_t
> >> > to refcount_t. By doing this we prevent intentional or accidental
> >> > underflows or overflows that can led to use-after-free vulnerabilities.
> >> >
> >> > The below patches are fully independent and can be cherry-picked
> separately.
> >> > Since we convert all kernel subsystems in the same fashion, resulting
> >> > in about 300 patches, we have to group them for sending at least in some
> >> > fashion to be manageable. Please excuse the long cc list.
> >> >
> >> > Not runtime tested, since I am not sure how to do it for ceph.
> >> > However changes are pretty trivial in this case.
> >> >
> >> > Elena Reshetova (2):
> >> >   fs, ceph: convert ceph_mds_session.s_ref from atomic_t to refcount_t
> >> >   fs, ceph: convert ceph_cap_snap.nref from atomic_t to refcount_t
> >> >
> >> >  fs/ceph/caps.c       |  4 ++--
> >> >  fs/ceph/mds_client.c | 18 +++++++++---------
> >> >  fs/ceph/mds_client.h |  5 +++--
> >> >  fs/ceph/snap.c       |  2 +-
> >> >  fs/ceph/super.h      |  5 +++--
> >> >  5 files changed, 18 insertions(+), 16 deletions(-)
> >>
> >> I'll pull these into testing.
> >
> > Just a check: how did testing went on this?
> > If everything is good, can you merge the changes?
> 
> Yep, I'll merge these into 4.12.

Great, thank you!

Best Regards,
Elena.
> 
> Thanks,
> 
>                 Ilya