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Date:   Wed, 28 Oct 2020 16:30:28 +1100 (AEDT)
From:   James Morris <jmorris@namei.org>
To:     =?ISO-8859-15?Q?Micka=EBl_Sala=FCn?= <mic@digikod.net>
cc:     "Serge E . Hallyn" <serge@hallyn.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Andy Lutomirski <luto@amacapital.net>,
        Anton Ivanov <anton.ivanov@cambridgegreys.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Casey Schaufler <casey@schaufler-ca.com>,
        Jann Horn <jannh@google.com>, Jeff Dike <jdike@addtoit.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Kees Cook <keescook@chromium.org>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        Shuah Khan <shuah@kernel.org>,
        Vincent Dagonneau <vincent.dagonneau@ssi.gouv.fr>,
        kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
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        linux-security-module@vger.kernel.org, x86@kernel.org,
        =?ISO-8859-15?Q?Micka=EBl_Sala=FCn?= <mic@linux.microsoft.com>
Subject: Re: [PATCH v22 06/12] fs,security: Add sb_delete hook
In-Reply-To: <20201027200358.557003-7-mic@digikod.net>
Message-ID: <alpine.LRH.2.21.2010281630040.25689@namei.org>
References: <20201027200358.557003-1-mic@digikod.net> <20201027200358.557003-7-mic@digikod.net>
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On Tue, 27 Oct 2020, Mickaël Salaün wrote:

> From: Mickaël Salaün <mic@linux.microsoft.com>
> 
> The sb_delete security hook is called when shutting down a superblock,
> which may be useful to release kernel objects tied to the superblock's
> lifetime (e.g. inodes).
> 
> This new hook is needed by Landlock to release (ephemerally) tagged
> struct inodes.  This comes from the unprivileged nature of Landlock
> described in the next commit.
> 
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: James Morris <jmorris@namei.org>
> Cc: Jann Horn <jannh@google.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Serge E. Hallyn <serge@hallyn.com>
> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>

Al, Kees, JJ et al, any objections?

-- 
James Morris
<jmorris@namei.org>

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