From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Cc: xen-devel@lists.xen.org
Subject: Re: [PATCH 11/15] flask: improve unknown permission handling
Date: Fri, 17 Jun 2016 11:45:48 -0400 [thread overview]
Message-ID: <20160617154548.GF1340@char.us.oracle.com> (raw)
In-Reply-To: <1465483638-9489-12-git-send-email-dgdegra@tycho.nsa.gov>
On Thu, Jun 09, 2016 at 10:47:14AM -0400, Daniel De Graaf wrote:
> When an unknown domctl, sysctl, or other operation is encountered in the
> FLASK security server, use the allow_unknown bit in the security policy
> to decide if the permission should be allowed or denied. This bit is
> off by default, but it can be set by using checkpolicy -U allow when
> compiling the policy. This allows new operations to be tested without
> needing to immediately add security checks; however, it is not flexible
> enough to avoid adding the actual permission checks. An error message
> is printed to the hypervisor console when this fallback is encountered.
.. and the operation is permitted.
>
> Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
> ---
> xen/xsm/flask/hooks.c | 44 +++++++++++++++++++++++++---------------
> xen/xsm/flask/include/security.h | 2 ++
> xen/xsm/flask/ss/policydb.c | 1 +
> xen/xsm/flask/ss/policydb.h | 6 ++++++
> xen/xsm/flask/ss/services.c | 5 +++++
> 5 files changed, 42 insertions(+), 16 deletions(-)
>
> diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
> index a8d45e7..3ab3fbf 100644
> --- a/xen/xsm/flask/hooks.c
> +++ b/xen/xsm/flask/hooks.c
> @@ -136,6 +136,23 @@ static int get_irq_sid(int irq, u32 *sid, struct avc_audit_data *ad)
> return 0;
> }
>
> +static int avc_unknown_permission(const char *name, int id)
> +{
> + int rc;
I would add a new line here.
> + if ( !flask_enforcing || security_get_allow_unknown() )
> + {
> + printk(XENLOG_G_WARNING "FLASK: Allowing unknown %s: %d.\n", name, id);
> + rc = 0;
> + }
> + else
> + {
> + printk(XENLOG_G_ERR "FLASK: Denying unknown %s: %d.\n", name, id);
> + rc = -EPERM;
> + }
> +
> + return rc;
> +}
> +
The rest looks OK, but I have a question: Is this how Linux operates?
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-06-17 15:45 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 14:47 [PATCH 00/15] XSM/FLASK updates for 4.8 Daniel De Graaf
2016-06-09 14:47 ` [PATCH 01/15] flask/policy: split into modules Daniel De Graaf
2016-06-14 18:55 ` Konrad Rzeszutek Wilk
2016-06-20 5:15 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 02/15] flask/policy: split out rules for system_r Daniel De Graaf
2016-06-14 19:08 ` Konrad Rzeszutek Wilk
2016-06-20 5:21 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 03/15] flask/policy: move user definitions and constraints into modules Daniel De Graaf
2016-06-17 15:28 ` Konrad Rzeszutek Wilk
2016-06-17 16:49 ` Daniel De Graaf
2016-06-20 5:22 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 04/15] flask/policy: remove unused support for binary modules Daniel De Graaf
2016-06-20 5:22 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 05/15] flask/policy: xenstore stubdom policy Daniel De Graaf
2016-06-17 15:34 ` Konrad Rzeszutek Wilk
2016-06-20 5:22 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 06/15] flask/policy: remove unused example Daniel De Graaf
2016-06-17 15:34 ` Konrad Rzeszutek Wilk
2016-06-20 5:23 ` Doug Goldstein
2016-06-09 14:47 ` [PATCH 07/15] flask: unify {get, set}vcpucontext permissions Daniel De Graaf
2016-06-17 15:37 ` Konrad Rzeszutek Wilk
2016-06-09 14:47 ` [PATCH 08/15] flask: remove unused secondary context in ocontext Daniel De Graaf
2016-06-09 16:01 ` Jan Beulich
2016-06-09 16:38 ` Daniel De Graaf
2016-06-09 14:47 ` [PATCH 09/15] flask: remove unused AVC callback functions Daniel De Graaf
2016-06-09 14:47 ` [PATCH 10/15] flask: remove xen_flask_userlist operation Daniel De Graaf
2016-06-09 16:07 ` Jan Beulich
2016-06-09 16:43 ` Daniel De Graaf
2016-06-10 6:51 ` Jan Beulich
2016-06-10 13:08 ` Daniel De Graaf
2016-06-10 14:28 ` Jan Beulich
2016-06-09 14:47 ` [PATCH 11/15] flask: improve unknown permission handling Daniel De Graaf
2016-06-17 15:45 ` Konrad Rzeszutek Wilk [this message]
2016-06-17 17:02 ` Daniel De Graaf
2016-06-17 17:13 ` Konrad Rzeszutek Wilk
2016-06-17 17:20 ` Daniel De Graaf
2016-06-09 14:47 ` [PATCH 12/15] xen/xsm: remove .xsm_initcall.init section Daniel De Graaf
2016-06-09 15:14 ` Andrew Cooper
2016-06-09 16:11 ` Jan Beulich
2016-06-09 16:42 ` Daniel De Graaf
2016-06-17 15:50 ` Konrad Rzeszutek Wilk
2016-06-17 17:04 ` Daniel De Graaf
2016-06-17 17:14 ` Konrad Rzeszutek Wilk
2016-06-17 17:18 ` Daniel De Graaf
2016-06-17 17:21 ` Konrad Rzeszutek Wilk
2016-06-17 23:17 ` Daniel De Graaf
2016-06-09 14:47 ` [PATCH 13/15] xsm: annotate setup functions with __init Daniel De Graaf
2016-06-09 15:15 ` Andrew Cooper
2016-06-09 14:47 ` [PATCH 14/15] xsm: clean up unregistration Daniel De Graaf
2016-06-09 15:16 ` Andrew Cooper
2016-06-17 15:51 ` Konrad Rzeszutek Wilk
2016-06-09 14:47 ` [PATCH 15/15] xsm: add a default policy to .init.data Daniel De Graaf
2016-06-09 15:30 ` Andrew Cooper
2016-06-09 16:58 ` Daniel De Graaf
2016-06-10 7:15 ` Jan Beulich
2016-06-09 16:15 ` Jan Beulich
2016-06-09 16:53 ` Daniel De Graaf
2016-06-09 21:54 ` Doug Goldstein
2016-06-10 14:50 ` Daniel De Graaf
2016-06-10 6:53 ` Jan Beulich
2016-06-17 15:54 ` Konrad Rzeszutek Wilk
2016-06-17 16:00 ` [PATCH 00/15] XSM/FLASK updates for 4.8 Konrad Rzeszutek Wilk
2016-06-20 5:40 ` Doug Goldstein
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=20160617154548.GF1340@char.us.oracle.com \
--to=konrad.wilk@oracle.com \
--cc=dgdegra@tycho.nsa.gov \
--cc=xen-devel@lists.xen.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).