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Commit 274a5855 authored by Kees Cook's avatar Kees Cook Committed by Greg Kroah-Hartman
Browse files

lkdtm: add "SPINLOCKUP" trigger 



For additional lockup testing, add "SPINLOCKUP" to trigger a spinlock
deadlock when triggered twice.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 65892723

drivers/misc/lkdtm.c

+7 −0
Original line number Diff line number Diff line
@@ -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();