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Smith" To: xen-devel@lists.xenproject.org, "Daniel P. Smith" Cc: scott.davis@starlab.io, jandryuk@gmail.com, Daniel De Graaf , Wei Liu , Anthony PERARD Subject: [PATCH v3 2/2] flask: implement xsm_set_system_active Date: Fri, 22 Apr 2022 12:34:58 -0400 Message-Id: <20220422163458.30170-3-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220422163458.30170-1-dpsmith@apertussolutions.com> References: <20220422163458.30170-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-ZohoMail-DKIM: pass (identity dpsmith@apertussolutions.com) X-ZM-MESSAGEID: 1650645362473100001 Content-Type: text/plain; charset="utf-8" This commit implements full support for starting the idle domain privileged= by introducing a new flask label xenboot_t which the idle domain is labeled wi= th at creation. It then provides the implementation for the XSM hook xsm_set_system_active to relabel the idle domain to the existing xen_t flask label. In the reference flask policy a new macro, xen_build_domain(target), is introduced for creating policies for dom0less/hyperlaunch allowing the hypervisor to create and assign the necessary resources for domain construction. Signed-off-by: Daniel P. Smith Reviewed-by: Jason Andryuk --- tools/flask/policy/modules/xen.if | 6 ++++++ tools/flask/policy/modules/xen.te | 1 + tools/flask/policy/policy/initial_sids | 1 + xen/xsm/flask/hooks.c | 8 +++++++- xen/xsm/flask/policy/initial_sids | 1 + 5 files changed, 16 insertions(+), 1 deletion(-) diff --git a/tools/flask/policy/modules/xen.if b/tools/flask/policy/modules= /xen.if index 5e2aa472b6..4ec676fff1 100644 --- a/tools/flask/policy/modules/xen.if +++ b/tools/flask/policy/modules/xen.if @@ -62,6 +62,12 @@ define(`create_domain_common', ` setparam altp2mhvm altp2mhvm_op dm }; ') =20 +# xen_build_domain(target) +# Allow a domain to be created at boot by the hypervisor +define(`xen_build_domain', ` + allow xenboot_t $1_channel:event create; +') + # create_domain(priv, target) # Allow a domain to be created directly define(`create_domain', ` diff --git a/tools/flask/policy/modules/xen.te b/tools/flask/policy/modules= /xen.te index 3dbf93d2b8..de98206fdd 100644 --- a/tools/flask/policy/modules/xen.te +++ b/tools/flask/policy/modules/xen.te @@ -24,6 +24,7 @@ attribute mls_priv; ##########################################################################= ###### =20 # The hypervisor itself +type xenboot_t, xen_type, mls_priv; type xen_t, xen_type, mls_priv; =20 # Domain 0 diff --git a/tools/flask/policy/policy/initial_sids b/tools/flask/policy/po= licy/initial_sids index 6b7b7eff21..ec729d3ba3 100644 --- a/tools/flask/policy/policy/initial_sids +++ b/tools/flask/policy/policy/initial_sids @@ -2,6 +2,7 @@ # objects created before the policy is loaded or for objects that do not h= ave a # label defined in some other manner. =20 +sid xenboot gen_context(system_u:system_r:xenboot_t,s0) sid xen gen_context(system_u:system_r:xen_t,s0) sid dom0 gen_context(system_u:system_r:dom0_t,s0) sid domxen gen_context(system_u:system_r:domxen_t,s0) diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c index 8a62de2fd6..4732ca4019 100644 --- a/xen/xsm/flask/hooks.c +++ b/xen/xsm/flask/hooks.c @@ -168,7 +168,7 @@ static int cf_check flask_domain_alloc_security(struct = domain *d) switch ( d->domain_id ) { case DOMID_IDLE: - dsec->sid =3D SECINITSID_XEN; + dsec->sid =3D SECINITSID_XENBOOT; break; case DOMID_XEN: dsec->sid =3D SECINITSID_DOMXEN; @@ -188,8 +188,12 @@ static int cf_check flask_domain_alloc_security(struct= domain *d) =20 static int cf_check flask_set_system_active(void) { + struct domain_security_struct *dsec; struct domain *d =3D current->domain; =20 + dsec =3D d->ssid; + ASSERT( dsec->sid =3D=3D SECINITSID_XENBOOT); + if ( d->domain_id !=3D DOMID_IDLE ) { printk("xsm_set_system_active should only be called by idle domain= \n"); @@ -203,6 +207,8 @@ static int cf_check flask_set_system_active(void) */ d->is_privileged =3D false; =20 + dsec->self_sid =3D dsec->sid =3D SECINITSID_XEN; + return 0; } =20 diff --git a/xen/xsm/flask/policy/initial_sids b/xen/xsm/flask/policy/initi= al_sids index 7eca70d339..e8b55b8368 100644 --- a/xen/xsm/flask/policy/initial_sids +++ b/xen/xsm/flask/policy/initial_sids @@ -3,6 +3,7 @@ # # Define initial security identifiers=20 # +sid xenboot sid xen sid dom0 sid domio --=20 2.20.1