For additional lockup testing, add "SPINLOCKUP" to trigger a spinlock deadlock when triggered twice.
Signed-off-by: Kees Cook <[email protected]> --- drivers/misc/lkdtm.c | 7 +++++++ 1 file changed, 7 insertions(+) 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 @@ enum ctype { CT_WRITE_AFTER_FREE, CT_SOFTLOCKUP, CT_HARDLOCKUP, + CT_SPINLOCKUP, CT_HUNG_TASK, }; @@ -106,6 +107,7 @@ static char* cp_type[] = { "WRITE_AFTER_FREE", "SOFTLOCKUP", "HARDLOCKUP", + "SPINLOCKUP", "HUNG_TASK", }; @@ -123,6 +125,7 @@ static enum cname cpoint = CN_INVALID; 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 @@ static void lkdtm_do_action(enum ctype which) 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(); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
