linux-kernel - [PATCH] watchdog: disable nmi perf event in the error path of enabling watchdog

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 for Android: free password hash cracker in your pocket

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

Date:	Sun, 17 Apr 2011 12:11:17 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Don Zickus <dzickus@...hat.com>
Subject: [PATCH] watchdog: disable nmi perf event in the error path of
 enabling watchdog

In corner cases where softlockup watchdog is not setup successfully,
the relevant nmi perf event for hardlockup watchdog could be disabled,
then the status of the underlying hardware remains unchanged.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/kernel/watchdog.c	2011-03-30 03:09:48.000000000 +0800
+++ b/kernel/watchdog.c	2011-04-17 11:58:10.000000000 +0800
@@ -430,9 +430,12 @@ static int watchdog_enable(int cpu)
 		p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
 		if (IS_ERR(p)) {
 			printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
-			if (!err)
+			if (!err) {
 				/* if hardlockup hasn't already set this */
 				err = PTR_ERR(p);
+				/* and disable the perf event */
+				watchdog_nmi_disable(cpu);
+			}
 			goto out;
 		}
 		kthread_bind(p, cpu);
--
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/