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Message-ID: <CANpmjNNnVx3=dQsoHL+T-95Z_iprCd3FXeYpnHdmi4d06X-x_g@mail.gmail.com>
Date: Wed, 24 Sep 2025 22:44:50 +0200
From: Marco Elver <elver@...gle.com>
To: Jinchao Wang <wangjinchao600@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Masami Hiramatsu <mhiramat@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Mike Rapoport <rppt@...nel.org>,
Alexander Potapenko <glider@...gle.com>, Randy Dunlap <rdunlap@...radead.org>,
Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Valentin Schneider <vschneid@...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>, David Hildenbrand <david@...hat.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
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Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>,
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Miguel Ojeda <ojeda@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, Rong Xu <xur@...gle.com>,
Naveen N Rao <naveen@...nel.org>, David Kaplan <david.kaplan@....com>,
Andrii Nakryiko <andrii@...nel.org>, Jinjie Ruan <ruanjinjie@...wei.com>,
Nam Cao <namcao@...utronix.de>, workflows@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-mm@...ck.org, llvm@...ts.linux.dev,
Andrey Ryabinin <ryabinin.a.a@...il.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>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v5 17/23] mm/ksw: add test module
On Wed, 24 Sept 2025 at 14:00, Jinchao Wang <wangjinchao600@...il.com> wrote:
>
> Introduce a separate test module to validate functionality in controlled
> scenarios.
>
> The module provides a proc interface (/proc/kstackwatch_test) that allows
> triggering specific test cases via simple commands:
>
> echo test0 > /proc/kstackwatch_test
This should not be in /proc/ - if anything, it should go into debugfs.
> Test module is built with optimizations disabled to ensure predictable
> behavior.
>
> Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
> ---
> mm/Kconfig.debug | 10 ++++
> mm/kstackwatch/Makefile | 6 ++
> mm/kstackwatch/test.c | 122 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 138 insertions(+)
> create mode 100644 mm/kstackwatch/test.c
>
> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
> index 89be351c0be5..291dd8a78b98 100644
> --- a/mm/Kconfig.debug
> +++ b/mm/Kconfig.debug
> @@ -317,3 +317,13 @@ config KSTACK_WATCH
> A lightweight real-time debugging tool to detect stack corrupting.
>
> If unsure, say N.
> +
> +config KSTACK_WATCH_TEST
> + tristate "KStackWatch Test Module"
> + depends on KSTACK_WATCH
> + help
> + This module provides controlled stack corruption scenarios to verify
> + the functionality of KStackWatch. It is useful for development and
> + validation of KStackWatch mechanism.
> +
> + If unsure, say N.
> diff --git a/mm/kstackwatch/Makefile b/mm/kstackwatch/Makefile
> index 84a46cb9a766..d007b8dcd1c6 100644
> --- a/mm/kstackwatch/Makefile
> +++ b/mm/kstackwatch/Makefile
> @@ -1,2 +1,8 @@
> obj-$(CONFIG_KSTACK_WATCH) += kstackwatch.o
> kstackwatch-y := kernel.o stack.o watch.o
> +
> +obj-$(CONFIG_KSTACK_WATCH_TEST) += kstackwatch_test.o
> +kstackwatch_test-y := test.o
> +CFLAGS_test.o := -fno-inline \
> + -fno-optimize-sibling-calls \
> + -fno-pic -fno-pie -O0 -Og
> diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c
> new file mode 100644
> index 000000000000..1ed98931cc51
> --- /dev/null
> +++ b/mm/kstackwatch/test.c
> @@ -0,0 +1,122 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/delay.h>
> +#include <linux/kthread.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/prandom.h>
> +#include <linux/printk.h>
> +#include <linux/proc_fs.h>
> +#include <linux/random.h>
> +#include <linux/spinlock.h>
> +#include <linux/string.h>
> +#include <linux/uaccess.h>
> +
> +#include "kstackwatch.h"
> +
> +static struct proc_dir_entry *test_proc;
> +
> +#define BUFFER_SIZE 16
> +#define MAX_DEPTH 6
> +
> +struct work_node {
> + ulong *ptr;
> + struct completion done;
> + struct list_head list;
> +};
> +
> +static DECLARE_COMPLETION(work_res);
> +static DEFINE_MUTEX(work_mutex);
> +static LIST_HEAD(work_list);
> +
> +static void test_watch_fire(void)
> +{
> + u64 buffer[BUFFER_SIZE] = { 0 };
> +
> + pr_info("entry of %s\n", __func__);
> + ksw_watch_show();
> + ksw_watch_fire();
> + pr_info("buf[0]:%lld\n", buffer[0]);
> +
> + barrier_data(buffer);
> + pr_info("exit of %s\n", __func__);
> +}
> +
> +
> +static ssize_t test_proc_write(struct file *file, const char __user *buffer,
> + size_t count, loff_t *pos)
> +{
> + char cmd[256];
> + int test_num;
> +
> + if (count >= sizeof(cmd))
> + return -EINVAL;
> +
> + if (copy_from_user(cmd, buffer, count))
> + return -EFAULT;
> +
> + cmd[count] = '\0';
> + strim(cmd);
> +
> + pr_info("received command: %s\n", cmd);
> +
> + if (sscanf(cmd, "test%d", &test_num) == 1) {
> + switch (test_num) {
> + case 0:
> + test_watch_fire();
> + break;
> + default:
> + pr_err("Unknown test number %d\n", test_num);
> + return -EINVAL;
> + }
> + } else {
> + pr_err("invalid command format. Use 'testN'.\n");
> + return -EINVAL;
> + }
> +
> + return count;
> +}
> +
> +static ssize_t test_proc_read(struct file *file, char __user *buffer,
> + size_t count, loff_t *pos)
> +{
> + static const char usage[] = "KStackWatch Simplified Test Module\n"
> + "============ usage ==============\n"
> + "Usage:\n"
> + "echo test{i} > /proc/kstackwatch_test\n"
> + " test0 - test watch fire\n";
> +
> + return simple_read_from_buffer(buffer, count, pos, usage,
> + strlen(usage));
> +}
> +
> +static const struct proc_ops test_proc_ops = {
> + .proc_read = test_proc_read,
> + .proc_write = test_proc_write,
> +};
> +
> +static int __init kstackwatch_test_init(void)
> +{
> + test_proc = proc_create("kstackwatch_test", 0600, NULL, &test_proc_ops);
> + if (!test_proc) {
> + pr_err("Failed to create proc entry\n");
> + return -ENOMEM;
> + }
> + pr_info("module loaded\n");
> + return 0;
> +}
> +
> +static void __exit kstackwatch_test_exit(void)
> +{
> + if (test_proc)
> + remove_proc_entry("kstackwatch_test", NULL);
> + pr_info("module unloaded\n");
> +}
> +
> +module_init(kstackwatch_test_init);
> +module_exit(kstackwatch_test_exit);
> +
> +MODULE_AUTHOR("Jinchao Wang");
> +MODULE_DESCRIPTION("Simple KStackWatch Test Module");
> +MODULE_LICENSE("GPL");
> --
> 2.43.0
>
> --
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