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Mon, 10 Nov 2025 08:38:14 -0800 (PST) From: Jinchao Wang To: Andrew Morton , "Masami Hiramatsu (Google)" , Peter Zijlstra , Randy Dunlap , Marco Elver , Mike Rapoport , Alexander Potapenko , Adrian Hunter , Alexander Shishkin , Alice Ryhl , Andrey Konovalov , Andrey Ryabinin , Andrii Nakryiko , Ard Biesheuvel , Arnaldo Carvalho de Melo , Ben Segall , Bill Wendling , Borislav Petkov , Catalin Marinas , Dave Hansen , David Hildenbrand , David Kaplan , "David S. Miller" , Dietmar Eggemann , Dmitry Vyukov , "H. Peter Anvin" , Ian Rogers , Ingo Molnar , James Clark , Jinchao Wang , Jinjie Ruan , Jiri Olsa , Jonathan Corbet , Juri Lelli , Justin Stitt , kasan-dev@googlegroups.com, Kees Cook , "Liam R. Howlett" , "Liang Kan" , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev, Lorenzo Stoakes , Mark Rutland , Masahiro Yamada , Mathieu Desnoyers , Mel Gorman , Michal Hocko , Miguel Ojeda , Nam Cao , Namhyung Kim , Nathan Chancellor , Naveen N Rao , Nick Desaulniers , Rong Xu , Sami Tolvanen , Steven Rostedt , Suren Baghdasaryan , Thomas Gleixner , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Valentin Schneider , Vincent Guittot , Vincenzo Frascino , Vlastimil Babka , Will Deacon , workflows@vger.kernel.org, x86@kernel.org Subject: [PATCH v8 21/27] mm/ksw: add test module Date: Tue, 11 Nov 2025 00:36:16 +0800 Message-ID: <20251110163634.3686676-22-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251110163634.3686676-1-wangjinchao600@gmail.com> References: <20251110163634.3686676-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: EA5CD180017 X-Stat-Signature: ujh9e8fiuxfzckqrnxgimykyzx8bumxd X-Rspam-User: X-HE-Tag: 1762792695-389161 X-HE-Meta: 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 xPdPg3mF 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a standalone test module for KStackWatch to validate functionality in controlled scenarios. The module exposes a simple interface via debugfs (/sys/kernel/debug/kstackwatch/test), allowing specific test cases to be triggered with commands such as: echo test0 > /sys/kernel/debug/kstackwatch/test To ensure predictable behavior during testing, the module is built with optimizations disabled. Signed-off-by: Jinchao Wang show addr of buf and watch_addr of test case --- include/linux/kstackwatch.h | 2 + mm/kstackwatch/Kconfig | 10 +++ mm/kstackwatch/Makefile | 6 ++ mm/kstackwatch/kernel.c | 5 ++ mm/kstackwatch/test.c | 121 ++++++++++++++++++++++++++++++++++++ 5 files changed, 144 insertions(+) create mode 100644 mm/kstackwatch/test.c diff --git a/include/linux/kstackwatch.h b/include/linux/kstackwatch.h index 6daded932ba6..7711efe85240 100644 --- a/include/linux/kstackwatch.h +++ b/include/linux/kstackwatch.h @@ -40,6 +40,8 @@ struct ksw_config { // singleton, only modified in kernel.c const struct ksw_config *ksw_get_config(void); +struct dentry *ksw_get_dbgdir(void); + /* stack management */ int ksw_stack_init(void); diff --git a/mm/kstackwatch/Kconfig b/mm/kstackwatch/Kconfig index 3c9385a15c33..343b492ddbd3 100644 --- a/mm/kstackwatch/Kconfig +++ b/mm/kstackwatch/Kconfig @@ -22,3 +22,13 @@ config KSTACKWATCH_PROFILING stopping. Useful for performance tuning, not for production use. If unsure, say N. + +config KSTACKWATCH_TEST + tristate "KStackWatch Test Module" + depends on KSTACKWATCH + 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 c99c621eac02..a2c7cd647f69 100644 --- a/mm/kstackwatch/Makefile +++ b/mm/kstackwatch/Makefile @@ -1,2 +1,8 @@ obj-$(CONFIG_KSTACKWATCH) += kstackwatch.o kstackwatch-y := kernel.o stack.o watch.o + +obj-$(CONFIG_KSTACKWATCH_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/kernel.c b/mm/kstackwatch/kernel.c index a0e676e60692..b25cf6830b15 100644 --- a/mm/kstackwatch/kernel.c +++ b/mm/kstackwatch/kernel.c @@ -235,6 +235,11 @@ const struct ksw_config *ksw_get_config(void) return ksw_config; } +struct dentry *ksw_get_dbgdir(void) +{ + return dbgfs_dir; +} + static int __init kstackwatch_init(void) { int ret = 0; diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c new file mode 100644 index 000000000000..2969564b1a00 --- /dev/null +++ b/mm/kstackwatch/test.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct dentry *test_file; + +#define BUFFER_SIZE 32 + +static void test_watch_fire(void) +{ + u64 buffer[BUFFER_SIZE] = { 0 }; + + pr_info("entry of %s\n", __func__); + ksw_watch_show(); + pr_info("buf: 0x%px\n", buffer); + + ksw_watch_fire(); + + barrier_data(buffer); + pr_info("exit of %s\n", __func__); +} + +static ssize_t test_dbgfs_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_dbgfs_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) +{ + static const char usage[] = + "KStackWatch Simplified Test Module\n" + "============ usage ===============\n" + "Usage:\n" + "echo test{i} > /sys/kernel/debug/kstackwatch/test\n" + " test0 - test watch fire\n"; + + return simple_read_from_buffer(buffer, count, ppos, usage, + strlen(usage)); +} + +static const struct file_operations test_dbgfs_fops = { + .owner = THIS_MODULE, + .read = test_dbgfs_read, + .write = test_dbgfs_write, + .llseek = noop_llseek, +}; + +static int __init kstackwatch_test_init(void) +{ + struct dentry *ksw_dir = ksw_get_dbgdir(); + + if (!ksw_dir) { + pr_err("kstackwatch must be loaded first\n"); + return -ENODEV; + } + + test_file = debugfs_create_file("test", 0600, ksw_dir, NULL, + &test_dbgfs_fops); + if (!test_file) { + pr_err("Failed to create debugfs test file\n"); + return -ENOMEM; + } + + pr_info("module loaded\n"); + return 0; +} + +static void __exit kstackwatch_test_exit(void) +{ + debugfs_remove(test_file); + pr_info("module unloaded\n"); +} + +module_init(kstackwatch_test_init); +module_exit(kstackwatch_test_exit); + +MODULE_AUTHOR("Jinchao Wang"); +MODULE_DESCRIPTION("KStackWatch Test Module"); +MODULE_LICENSE("GPL"); -- 2.43.0