* [PATCH] workqueue: reject watchdog thresholds that overflow jiffies
@ 2026-08-25 6:48 Jiacheng Xu
2026-08-25 7:03 ` [PATCH RESEND] " Jiacheng Xu
0 siblings, 1 reply; 3+ messages in thread
From: Jiacheng Xu @ 2026-08-25 6:48 UTC (permalink / raw)
To: Tejun Heo; +Cc: Lai Jiangshan, linux-kernel, m0ck1ng
From: m0ck1ng <stitch@zju.edu.cn>
The watchdog threshold is supplied in seconds but is multiplied by HZ
before being used as a jiffies interval. Reject values that exceed
MAX_JIFFY_OFFSET / HZ so the multiplication cannot wrap and the
time_after() comparisons remain within their supported range.
The check is performed before changing the threshold or watchdog timer.
Zero remains the value used to disable the watchdog.
Fixes: 82607adcf9cdf ("workqueue: implement lockup detector")
Signed-off-by: m0ck1ng <stitch@zju.edu.cn>
---
kernel/workqueue.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bfeef512f6dd..3ea568807f26 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -8026,6 +8026,9 @@ static int wq_watchdog_param_set_thresh(const char *val,
if (ret)
return ret;
+ if (thresh > MAX_JIFFY_OFFSET / HZ)
+ return -ERANGE;
+
if (system_percpu_wq)
wq_watchdog_set_thresh(thresh);
else
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH RESEND] workqueue: reject watchdog thresholds that overflow jiffies
2026-08-25 6:48 [PATCH] workqueue: reject watchdog thresholds that overflow jiffies Jiacheng Xu
@ 2026-08-25 7:03 ` Jiacheng Xu
2026-08-31 17:33 ` Tejun Heo
0 siblings, 1 reply; 3+ messages in thread
From: Jiacheng Xu @ 2026-08-25 7:03 UTC (permalink / raw)
To: Tejun Heo; +Cc: Lai Jiangshan, linux-kernel, Jiacheng Xu
The watchdog threshold is supplied in seconds but is multiplied by HZ
before being used as a jiffies interval. Reject values that exceed
MAX_JIFFY_OFFSET / HZ so the multiplication cannot wrap and the
time_after() comparisons remain within their supported range.
The check is performed before changing the threshold or watchdog timer.
Zero remains the value used to disable the watchdog.
Fixes: 82607adcf9cdf ("workqueue: implement lockup detector")
Signed-off-by: Jiacheng Xu <stitch@zju.edu.cn>
---
kernel/workqueue.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bfeef512f6dd..3ea568807f26 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -8026,6 +8026,9 @@ static int wq_watchdog_param_set_thresh(const char *val,
if (ret)
return ret;
+ if (thresh > MAX_JIFFY_OFFSET / HZ)
+ return -ERANGE;
+
if (system_percpu_wq)
wq_watchdog_set_thresh(thresh);
else
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-08-31 17:33 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2026-08-25 6:48 [PATCH] workqueue: reject watchdog thresholds that overflow jiffies Jiacheng Xu
2026-08-25 7:03 ` [PATCH RESEND] " Jiacheng Xu
2026-08-31 17:33 ` Tejun Heo
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