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-rw-r--r--drivers/misc/lkdtm/bugs.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm/bugs.c b/drivers/misc/lkdtm/bugs.c
index c66cc05a68c4..b080eb2335eb 100644
--- a/drivers/misc/lkdtm/bugs.c
+++ b/drivers/misc/lkdtm/bugs.c
@@ -6,12 +6,14 @@
* test source files.
*/
#include "lkdtm.h"
+#include <linux/cpu.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
-#include <linux/uaccess.h>
#include <linux/slab.h>
+#include <linux/stop_machine.h>
+#include <linux/uaccess.h>
#if IS_ENABLED(CONFIG_X86_32) && !IS_ENABLED(CONFIG_UML)
#include <asm/desc.h>
@@ -73,6 +75,31 @@ static void lkdtm_PANIC(void)
panic("dumptest");
}
+static int panic_stop_irqoff_fn(void *arg)
+{
+ atomic_t *v = arg;
+
+ /*
+ * As stop_machine() disables interrupts, all CPUs within this function
+ * have interrupts disabled and cannot take a regular IPI.
+ *
+ * The last CPU which enters here will trigger a panic, and as all CPUs
+ * cannot take a regular IPI, we'll only be able to stop secondaries if
+ * smp_send_stop() or crash_smp_send_stop() uses an NMI.
+ */
+ if (atomic_inc_return(v) == num_online_cpus())
+ panic("panic stop irqoff test");
+
+ for (;;)
+ cpu_relax();
+}
+
+static void lkdtm_PANIC_STOP_IRQOFF(void)
+{
+ atomic_t v = ATOMIC_INIT(0);
+ stop_machine(panic_stop_irqoff_fn, &v, cpu_online_mask);
+}
+
static void lkdtm_BUG(void)
{
BUG();
@@ -638,6 +665,7 @@ static noinline void lkdtm_CORRUPT_PAC(void)
static struct crashtype crashtypes[] = {
CRASHTYPE(PANIC),
+ CRASHTYPE(PANIC_STOP_IRQOFF),
CRASHTYPE(BUG),
CRASHTYPE(WARNING),
CRASHTYPE(WARNING_MESSAGE),