linux-kernel - [PATCH 3/4] lkdtm: add "SPINLOCKUP" trigger

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 22 Jun 2013 11:37:06 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, Ankita Garg <ankita@...ibm.com>,
	Simon Kagstrom <simon.kagstrom@...insight.net>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH 3/4] lkdtm: add "SPINLOCKUP" trigger

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

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 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 majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/