From: Kunwu Chan <kunwu.chan@gmail.com>
To: jiangshanlai@gmail.com, paulmck@kernel.org,
josh@joshtriplett.org, work@onurozkan.dev, frederic@kernel.org,
neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com,
boqun@kernel.org, urezki@gmail.com
Cc: rostedt@goodmis.org, mathieu.desnoyers@efficios.com,
qiang.zhang@linux.dev, rcu@vger.kernel.org,
linux-kernel@vger.kernel.org, Kunwu Chan <kunwu.chan@gmail.com>,
Kunwu Chan <chentao@kylinos.cn>
Subject: [PATCH v2 02/10] srcutiny: Record callback registration stack for KASAN
Date: Tue, 27 Oct 2026 15:09:15 +0800 [thread overview]
Message-ID: <20261027070923.3054462-3-kunwu.chan@gmail.com> (raw)
In-Reply-To: <20261027070923.3054462-1-kunwu.chan@gmail.com>
Record the callback registration stack in call_srcu()
for KASAN diagnostics involving Tiny SRCU callbacks.
Suggested-by: Zqiang <qiang.zhang@linux.dev>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
---
kernel/rcu/srcutiny.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
index 63a3f0a8bc53..3ee28885b96f 100644
--- a/kernel/rcu/srcutiny.c
+++ b/kernel/rcu/srcutiny.c
@@ -10,6 +10,7 @@
#include <linux/export.h>
#include <linux/irq_work.h>
+#include <linux/kasan.h>
#include <linux/llist.h>
#include <linux/mutex.h>
#include <linux/preempt.h>
@@ -290,6 +291,9 @@ EXPORT_SYMBOL_GPL(srcu_defer_drain);
void call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp,
rcu_callback_t func)
{
+ /* Record the caller: the irq_work's stack says nothing about it. */
+ kasan_record_aux_stack(rhp);
+
if (should_rcu_defer()) {
/* A re-entrant call_srcu() during the drain would livelock it. */
if (READ_ONCE(srcu_defer_draining) && !in_nmi()) {
--
2.43.0
next prev parent reply other threads:[~2026-10-27 7:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 7:09 [PATCH v2 00/10] rcu: Improve callback diagnostics and validation Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 01/10] srcu: Record callback registration stack for KASAN Kunwu Chan
2026-10-27 7:09 ` Kunwu Chan [this message]
2026-10-27 7:09 ` [PATCH v2 03/10] rcu: Record callback registration stack for Tiny RCU Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 04/10] srcu: Validate callback arguments Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 05/10] rcu: Validate callback arguments in Tiny RCU Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 06/10] rcu-tasks: Validate callback arguments Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 07/10] srcu: Detect duplicate callback enqueue at registration Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 08/10] srcutiny: Detect duplicate callback enqueue Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 09/10] rcu-tasks: " Kunwu Chan
2026-10-27 7:09 ` [PATCH v2 10/10] rcu: Improve duplicate callback diagnostics Kunwu Chan
2026-10-27 23:13 ` [PATCH v2 00/10] rcu: Improve callback diagnostics and validation Joel Fernandes
2026-10-28 2:17 ` KunWu Chan
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