netdev - Re: New skb extension for use by LSMs (skb "security blob")?

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Message-ID: <20190822201520.GJ20113@breakpoint.cc>
Date:   Thu, 22 Aug 2019 22:15:20 +0200
From:   Florian Westphal <fw@...len.de>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Paul Moore <paul@...l-moore.com>, Florian Westphal <fw@...len.de>,
        netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
        selinux@...r.kernel.org
Subject: Re: New skb extension for use by LSMs (skb "security blob")?

Casey Schaufler <casey@...aufler-ca.com> wrote:
> Given that the original objection to using a skb extension for a
> security blob was that an extension is dynamic, and that the ubiquitous
> nature of LSM use makes that unreasonable, it would seem that supporting
> the security blob as a basic part if the skb would be the obvious and
> correct solution. If the normal case is that there is an LSM that would
> befit from the native (unextended) support of a blob, it would seem
> that that is the case that should be optimized.

What is this "blob"? i.e., what would you like to add to sk_buff to make
whatever use cases you have in mind work?