[PATCH v4 04/21] mm/ksw: add build system support
From: Jinchao Wang <hidden>
Date: 2025-09-12 10:12:18
Also in:
linux-doc, linux-mm, linux-perf-users, lkml, llvm, workflows
Subsystem:
memory management, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Add Kconfig and Makefile infrastructure. The implementation is located under mm/kstackwatch/. Signed-off-by: Jinchao Wang <redacted> --- 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