linux-kernel - Re: [PATCH 0/3] Convert nsproxy, groups, and creds to refcount

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Date:   Mon, 15 Jun 2020 10:10:08 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>
CC:     David Windsor <dwindsor@...il.com>,
        Hans Liljestrand <ishkamiel@...il.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "Paul Moore" <paul@...l-moore.com>, <edumazet@...gle.com>,
        <paulmck@...nel.org>, David Howells <dhowells@...hat.com>,
        <shakeelb@...gle.com>, James Morris <jamorris@...ux.microsoft.com>,
        <alex.huangjianhui@...wei.com>, <dylix.dailei@...wei.com>,
        <chenzefeng2@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Convert nsproxy, groups, and creds to refcount_t

On 2020/6/13 2:34, Kees Cook wrote:
> This series was never applied[1], and was recently pointed out as
> missing[2]. If someone has a tree for this, please take it. Otherwise,
> please Ack and I'll send it to Linus.
> 
> Thanks!
> 
> -Kees
> 
> [1] https://lore.kernel.org/lkml/20190306110549.7628-1-elena.reshetova@intel.com/
> [2] https://lore.kernel.org/lkml/1591957695-118312-1-git-send-email-nixiaoming@huawei.com/
> 
> Elena Reshetova (3):
>    nsproxy: convert nsproxy.count to refcount_t
>    groups: convert group_info.usage to refcount_t
>    creds: convert cred.usage to refcount_t
> 
>   include/linux/cred.h    | 15 +++++++-------
>   include/linux/nsproxy.h |  7 +++----
>   kernel/cred.c           | 44 ++++++++++++++++++++---------------------
>   kernel/groups.c         |  2 +-
>   kernel/nsproxy.c        |  6 +++---
>   net/sunrpc/auth.c       |  2 +-
>   6 files changed, 38 insertions(+), 38 deletions(-)
> 

Should mm->mm_users also be replaced by refcount_t?

In addition, is it better to change all variables that use 
atomic_dec_and_test to control the release process to refconut_t?

Thanks
Xiaoming Ni