lkdtm: add "SPINLOCKUP" trigger
For additional lockup testing, add "SPINLOCKUP" to trigger a spinlock
deadlock when triggered twice.
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index b1323fc..8bc7f0b 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -78,6 +78,7 @@
CT_WRITE_AFTER_FREE,
CT_SOFTLOCKUP,
CT_HARDLOCKUP,
+ CT_SPINLOCKUP,
CT_HUNG_TASK,
};
@@ -106,6 +107,7 @@
"WRITE_AFTER_FREE",
"SOFTLOCKUP",
"HARDLOCKUP",
+ "SPINLOCKUP",
"HUNG_TASK",
};
@@ -123,6 +125,7 @@
static enum ctype cptype = CT_NONE;
static int count = DEFAULT_COUNT;
static DEFINE_SPINLOCK(count_lock);
+static DEFINE_SPINLOCK(lock_me_up);
module_param(recur_count, int, 0644);
MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\
@@ -345,6 +348,10 @@
for (;;)
cpu_relax();
break;
+ case CT_SPINLOCKUP:
+ /* Must be called twice to trigger. */
+ spin_lock(&lock_me_up);
+ break;
case CT_HUNG_TASK:
set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
