linux-kernel - [PATCH v3 03/19] mm/ksw: add build system support

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Message-ID: <20250910052335.1151048-4-wangjinchao600@gmail.com>
Date: Wed, 10 Sep 2025 13:23:12 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Rapoport <rppt@...nel.org>,
	"Naveen N . Rao" <naveen@...nel.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	kasan-dev@...glegroups.com,
	"David S. Miller" <davem@...emloft.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Jinchao Wang <wangjinchao600@...il.com>
Subject: [PATCH v3 03/19] mm/ksw: add build system support

Add Kconfig and Makefile infrastructure.

The implementation is located under `mm/kstackwatch/`.

Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
---
 mm/Kconfig.debug             | 11 +++++++++++
 mm/Makefile                  |  1 +
 mm/kstackwatch/Makefile      |  2 ++
 mm/kstackwatch/kernel.c      | 22 ++++++++++++++++++++++
 mm/kstackwatch/kstackwatch.h |  5 +++++
 mm/kstackwatch/stack.c       |  1 +
 mm/kstackwatch/watch.c       |  1 +
 7 files changed, 43 insertions(+)
 create mode 100644 mm/kstackwatch/Makefile
 create mode 100644 mm/kstackwatch/kernel.c
 create mode 100644 mm/kstackwatch/kstackwatch.h
 create mode 100644 mm/kstackwatch/stack.c
 create mode 100644 mm/kstackwatch/watch.c

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 32b65073d0cc..fdfc6e6d0dec 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -309,3 +309,14 @@ config PER_VMA_LOCK_STATS
 	  overhead in the page fault path.
 
 	  If in doubt, say N.
+
+config KSTACK_WATCH
+	tristate "Kernel Stack Watch"
+	depends on HAVE_HW_BREAKPOINT && KPROBES && FPROBE
+	select HAVE_REINSTALL_HW_BREAKPOINT
+	help
+	  A lightweight real-time debugging tool to detect stack corruption.
+	  It can watch either the canary or local variable and tracks
+	  the recursive depth of the monitored function.
+
+	  If unsure, say N.
diff --git a/mm/Makefile b/mm/Makefile
index ef54aa615d9d..665c9f2bf987 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_PAGE_POISONING) += page_poison.o
 obj-$(CONFIG_KASAN)	+= kasan/
 obj-$(CONFIG_KFENCE) += kfence/
 obj-$(CONFIG_KMSAN)	+= kmsan/
+obj-$(CONFIG_KSTACK_WATCH)	+= kstackwatch/
 obj-$(CONFIG_FAILSLAB) += failslab.o
 obj-$(CONFIG_FAIL_PAGE_ALLOC) += fail_page_alloc.o
 obj-$(CONFIG_MEMTEST)		+= memtest.o
diff --git a/mm/kstackwatch/Makefile b/mm/kstackwatch/Makefile
new file mode 100644
index 000000000000..84a46cb9a766
--- /dev/null
+++ b/mm/kstackwatch/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_KSTACK_WATCH)	+= kstackwatch.o
+kstackwatch-y := kernel.o stack.o watch.o
diff --git a/mm/kstackwatch/kernel.c b/mm/kstackwatch/kernel.c
new file mode 100644
index 000000000000..40aa7e9ff513
--- /dev/null
+++ b/mm/kstackwatch/kernel.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+
+MODULE_AUTHOR("Jinchao Wang");
+MODULE_DESCRIPTION("Kernel Stack Watch");
+MODULE_LICENSE("GPL");
+
+static int __init kstackwatch_init(void)
+{
+	pr_info("module loaded\n");
+	return 0;
+}
+
+static void __exit kstackwatch_exit(void)
+{
+	pr_info("module unloaded\n");
+}
+
+module_init(kstackwatch_init);
+module_exit(kstackwatch_exit);
diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h
new file mode 100644
index 000000000000..0273ef478a26
--- /dev/null
+++ b/mm/kstackwatch/kstackwatch.h
@@ -0,0 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _KSTACKWATCH_H
+#define _KSTACKWATCH_H
+
+#endif /* _KSTACKWATCH_H */
diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c
new file mode 100644
index 000000000000..cec594032515
--- /dev/null
+++ b/mm/kstackwatch/stack.c
@@ -0,0 +1 @@
+// SPDX-License-Identifier: GPL-2.0
diff --git a/mm/kstackwatch/watch.c b/mm/kstackwatch/watch.c
new file mode 100644
index 000000000000..cec594032515
--- /dev/null
+++ b/mm/kstackwatch/watch.c
@@ -0,0 +1 @@
+// SPDX-License-Identifier: GPL-2.0
-- 
2.43.0