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

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Message-ID: <3212525.1595934111@warthog.procyon.org.uk>
Date:   Tue, 28 Jul 2020 12:01:51 +0100
From:   David Howells <dhowells@...hat.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     dhowells@...hat.com, Xiaoming Ni <nixiaoming@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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, 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

Kees Cook <keescook@...omium.org> wrote:

> > I've been gradually undoing some of the conversions as there's no equivalent
> > of atomic_add_return() and atomic_dec_return() that allow me to log the
> > altered refcount through a tracepoint.
> 
> Please do not _undo_ the changes; just add the API you need.

And _please_ do not convert atomic_inc/dec_return() into refcount_read() +
refcount_xxx().  They are _not_ equivalent.

David