linux-kernel - Re: [PATCH 1/3] ipc: convert ipc_namespace.count from atomic_t to refcount

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Message-ID: <ea372e4f-0c0e-9ce3-dcb8-d36806003ec9@colorfullife.com>
Date:   Sun, 28 May 2017 14:10:40 +0200
From:   Manfred Spraul <manfred@...orfullife.com>
To:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...hat.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, arozansk@...hat.com,
        Davidlohr Bueso <dave@...olabs.net>,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 1/3] ipc: convert ipc_namespace.count from atomic_t to
 refcount_t

On 05/27/2017 09:41 PM, Kees Cook wrote:
> On Mon, Feb 20, 2017 at 3:29 AM, Elena Reshetova
> <elena.reshetova@...el.com> 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>
> Manfred, is this okay by you? I think this should go via -mm...
The patch is ok, the refcounters are not in the critical path.
I'll try to test the patches and then I would send an 'Acked-by', but 
this will take some days.

--
     Manfred