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From: Tejun Heo <tj@kernel.org>
To: Ondrej Mosnacek <omosnace@redhat.com>
Cc: selinux@vger.kernel.org, Paul Moore <paul@paul-moore.com>,
	Stephen Smalley <sds@tycho.nsa.gov>,
	Linux Security Module list 
	<linux-security-module@vger.kernel.org>,
	Casey Schaufler <casey@schaufler-ca.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org
Subject: Re: [PATCH v3 5/5] kernfs: initialize security of newly created nodes
Date: Thu, 31 Jan 2019 06:22:44 -0800
Message-ID: <20190131142244.GB50184@devbig004.ftw2.facebook.com> (raw)
In-Reply-To: <CAFqZXNt0jNg2-bNbtsCX2=7bcb_GaxCnHfSyck=GksXBTkWJ-g@mail.gmail.com>

Hello,

On Thu, Jan 31, 2019 at 11:20:57AM +0100, Ondrej Mosnacek wrote:
> Hm, I see... basically the only thing that gets allocated in
> kernfs_node_init_security() by default (at least under SELinux/ no
> LSM) is the kernfs_iattrs structures, so I assume you are pointing at
> that. I think this can be easily fixed, if we again use the assumption

Yeap.

> Technically this might make some LSMs unhappy, if they want to set
> some non-default context even if parent is all default, but this is
> already impossible now and in this case I think we have no better
> choice than sacrificing a bit of flexibility for memory efficiency,
> which is apparently critical here.
> 
> Tejun, Casey, would the above modification be fine with you?

Generally looks good but maybe it can check the attr to see whether
there actually are things which need inheritance?

Thanks.

-- 
tejun

  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30 11:41 [PATCH v3 0/5] Allow initializing the kernfs node's secctx based on its parent Ondrej Mosnacek
2019-01-30 11:41 ` [PATCH v3 1/5] selinux: try security xattr after genfs for kernfs filesystems Ondrej Mosnacek
2019-01-30 11:41 ` [PATCH v3 2/5] kernfs: use simple_xattrs for security attributes Ondrej Mosnacek
2019-01-30 11:41 ` [PATCH v3 3/5] LSM: add new hook for kernfs node initialization Ondrej Mosnacek
2019-01-30 11:41 ` [PATCH v3 4/5] selinux: implement the kernfs_init_security hook Ondrej Mosnacek
2019-01-30 11:41 ` [PATCH v3 5/5] kernfs: initialize security of newly created nodes Ondrej Mosnacek
2019-01-30 17:09   ` Tejun Heo
2019-01-31 10:20     ` Ondrej Mosnacek
2019-01-31 14:22       ` Tejun Heo [this message]
2019-01-31 16:39       ` Casey Schaufler
2019-02-04  9:48         ` Ondrej Mosnacek

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