From: Casey Schaufler <casey@schaufler-ca.com>
To: Florian Westphal <fw@strlen.de>
Cc: Paul Moore <paul@paul-moore.com>,
netdev@vger.kernel.org, linux-security-module@vger.kernel.org,
selinux@vger.kernel.org, casey@schaufler-ca.com
Subject: Re: New skb extension for use by LSMs (skb "security blob")?
Date: Thu, 22 Aug 2019 13:35:01 -0700 [thread overview]
Message-ID: <32646e98-2ed6-a63a-5589-fefd57e85f66@schaufler-ca.com> (raw)
In-Reply-To: <20190822201520.GJ20113@breakpoint.cc>
On 8/22/2019 1:15 PM, Florian Westphal wrote:
> Casey Schaufler <casey@schaufler-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?
In LSM terminology a blob is a set of data managed and used by
the LSM (either in the infrastructure or the security module).
Blob pointers are included in the system data structures to which
they relate. The inode has an i_security field, which is a void *.
If the secmark where replaced by a security blob, the u32 secmark field
in an sk_buff would be replaced by a void * security field.
next prev parent reply other threads:[~2019-08-22 20:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 22:00 New skb extension for use by LSMs (skb "security blob")? Paul Moore
2019-08-21 22:50 ` David Miller
2019-08-22 3:27 ` Paul Moore
2019-08-22 3:54 ` David Miller
2019-08-22 18:50 ` Casey Schaufler
2019-08-22 7:03 ` Florian Westphal
2019-08-22 16:32 ` Paul Moore
2019-08-22 20:10 ` Casey Schaufler
2019-08-22 20:15 ` Florian Westphal
2019-08-22 20:35 ` Casey Schaufler [this message]
2019-08-22 21:18 ` David Miller
2019-08-22 21:59 ` Casey Schaufler
2019-08-22 22:28 ` David Miller
2019-08-22 22:34 ` Casey Schaufler
2019-08-22 22:36 ` David Miller
2019-08-23 18:56 ` Casey Schaufler
2019-08-22 21:17 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=32646e98-2ed6-a63a-5589-fefd57e85f66@schaufler-ca.com \
--to=casey@schaufler-ca.com \
--cc=fw@strlen.de \
--cc=linux-security-module@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paul@paul-moore.com \
--cc=selinux@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).