[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] flask: implement xsm_set_system_active
commit a0bb0960e5ed2d6b59aff5c0eae74d8347bab32b Author: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx> AuthorDate: Mon Jul 4 14:47:00 2022 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Mon Jul 4 14:47:00 2022 +0200 flask: implement xsm_set_system_active 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 with 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 <dpsmith@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx> Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx> Tested-by: Luca Fancellu <luca.fancellu@xxxxxxx> Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx> Tested-by: Rahul Singh <rahul.singh@xxxxxxx> --- tools/flask/policy/modules/xen.if | 7 +++++++ tools/flask/policy/modules/xen.te | 1 + tools/flask/policy/policy/initial_sids | 1 + xen/xsm/flask/hooks.c | 9 ++++++++- xen/xsm/flask/policy/initial_sids | 1 + 5 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/flask/policy/modules/xen.if b/tools/flask/policy/modules/xen.if index 5e2aa472b6..424daab6a0 100644 --- a/tools/flask/policy/modules/xen.if +++ b/tools/flask/policy/modules/xen.if @@ -62,6 +62,13 @@ define(`create_domain_common', ` setparam altp2mhvm altp2mhvm_op dm }; ') +# xen_build_domain(target) +# Allow a domain to be created at boot by the hypervisor +define(`xen_build_domain', ` + allow xenboot_t $1:domain create; + 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; ################################################################################ # The hypervisor itself +type xenboot_t, xen_type, mls_priv; type xen_t, xen_type, mls_priv; # Domain 0 diff --git a/tools/flask/policy/policy/initial_sids b/tools/flask/policy/policy/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 have a # label defined in some other manner. +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 c97c44f803..8c9cd0f297 100644 --- a/xen/xsm/flask/hooks.c +++ b/xen/xsm/flask/hooks.c @@ -173,7 +173,7 @@ static int cf_check flask_domain_alloc_security(struct domain *d) switch ( d->domain_id ) { case DOMID_IDLE: - dsec->sid = SECINITSID_XEN; + dsec->sid = SECINITSID_XENBOOT; break; case DOMID_XEN: dsec->sid = SECINITSID_DOMXEN; @@ -193,9 +193,14 @@ static int cf_check flask_domain_alloc_security(struct domain *d) static int cf_check flask_set_system_active(void) { + struct domain_security_struct *dsec; struct domain *d = current->domain; + dsec = d->ssid; + ASSERT(d->is_privileged); + ASSERT(dsec->sid == SECINITSID_XENBOOT); + ASSERT(dsec->self_sid == SECINITSID_XENBOOT); if ( d->domain_id != DOMID_IDLE ) { @@ -210,6 +215,8 @@ static int cf_check flask_set_system_active(void) */ d->is_privileged = false; + dsec->self_sid = dsec->sid = SECINITSID_XEN; + return 0; } diff --git a/xen/xsm/flask/policy/initial_sids b/xen/xsm/flask/policy/initial_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 # +sid xenboot sid xen sid dom0 sid domio -- generated by git-patchbot for /home/xen/git/xen.git#master
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