[PATCH 02/10] xsm: Add security label to IRQ debug output

[Daniel De Graaf <dgdegra@tycho.nsa.gov>]

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
---
 xen/arch/x86/irq.c    |    8 ++++++++
 xen/include/xsm/xsm.h |    7 +++++++
 xen/xsm/dummy.c       |    7 ++++++-
 xen/xsm/flask/hooks.c |   16 ++++++++++++++++
 4 files changed, 37 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 058f89d..6d17ec0 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -2001,6 +2001,7 @@ static void dump_irqs(unsigned char key)
     struct domain *d;
     const struct pirq *info;
     unsigned long flags;
+    char *ssid;
 
     printk("Guest interrupt information:\n");
 
@@ -2012,6 +2013,8 @@ static void dump_irqs(unsigned char key)
         if ( !irq_desc_initialized(desc) || desc->handler == &no_irq_type )
             continue;
 
+        ssid = xsm_show_irq_sid(irq);
+
         spin_lock_irqsave(&desc->lock, flags);
 
         cpumask_scnprintf(keyhandler_scratch, sizeof(keyhandler_scratch),
@@ -2021,6 +2024,9 @@ static void dump_irqs(unsigned char key)
                irq, keyhandler_scratch, desc->arch.vector,
                desc->handler->typename, desc->status);
 
+        if ( ssid )
+            printk("Z=%-25s ", ssid);
+
         if ( !(desc->status & IRQ_GUEST) )
             printk("mapped, unbound\n");
         else
@@ -2053,6 +2059,8 @@ static void dump_irqs(unsigned char key)
         }
 
         spin_unlock_irqrestore(&desc->lock, flags);
+
+        xfree(ssid);
     }
 
     dump_ioapic_irq_info();
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 92204b3..6e3a8f0 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -113,6 +113,8 @@ struct xsm_operations {
 
     int (*kexec) (void);
     int (*schedop_shutdown) (struct domain *d1, struct domain *d2);
+
+    char *(*show_irq_sid) (int irq);
     int (*irq_permission) (struct domain *d, int pirq, uint8_t allow);
     int (*iomem_permission) (struct domain *d, uint64_t s, uint64_t e, uint8_t allow);
     int (*pci_config_permission) (struct domain *d, uint32_t machine_bdf, uint16_t start, uint16_t end, uint8_t access);
@@ -477,6 +479,11 @@ static inline int xsm_schedop_shutdown (struct domain *d1, struct domain *d2)
     return xsm_call(schedop_shutdown(d1, d2));
 }
 
+static inline char *xsm_show_irq_sid (int irq)
+{
+    return xsm_call(show_irq_sid(irq));
+}
+
 static inline int xsm_irq_permission (struct domain *d, int pirq, uint8_t allow)
 {
     return xsm_call(irq_permission(d, pirq, allow));
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index fca9d7b..83e5dba 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -365,12 +365,16 @@ static int dummy_sched_op (void)
     return 0;
 }
 
-
 static long dummy___do_xsm_op(XEN_GUEST_HANDLE(xsm_op_t) op)
 {
     return -ENOSYS;
 }
 
+static char *dummy_show_irq_sid (int irq)
+{
+    return NULL;
+}
+
 static int dummy_irq_permission (struct domain *d, int pirq, uint8_t allow)
 {
     return 0;
@@ -655,6 +659,7 @@ void xsm_fixup_ops (struct xsm_operations *ops)
     set_to_dummy_if_null(ops, kexec);
     set_to_dummy_if_null(ops, schedop_shutdown);
 
+    set_to_dummy_if_null(ops, show_irq_sid);
     set_to_dummy_if_null(ops, irq_permission);
     set_to_dummy_if_null(ops, iomem_permission);
     set_to_dummy_if_null(ops, pci_config_permission);
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index d207b1d..d79405b 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -712,6 +712,20 @@ static inline u32 resource_to_perm(uint8_t access)
         return RESOURCE__REMOVE;
 }
 
+static char *flask_show_irq_sid (int irq)
+{
+    u32 sid, ctx_len;
+    char *ctx;
+    int rc = security_irq_sid(irq, &sid);
+    if ( rc )
+        return NULL;
+
+    if (security_sid_to_context(sid, &ctx, &ctx_len))
+        return NULL;
+
+    return ctx;
+}
+
 static int flask_irq_permission (struct domain *d, int pirq, uint8_t access)
 {
     u32 perm;
@@ -1543,6 +1557,8 @@ static struct xsm_operations flask_ops = {
     .kexec = flask_kexec,
     .schedop_shutdown = flask_schedop_shutdown,
 
+    .show_irq_sid = flask_show_irq_sid,
+
     .irq_permission = flask_irq_permission,
     .iomem_permission = flask_iomem_permission,
     .pci_config_permission = flask_pci_config_permission,
-- 
1.7.7.6