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Mon, 10 Nov 2025 08:38:18 -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 22/27] mm/ksw: add stack overflow test Date: Tue, 11 Nov 2025 00:36:17 +0800 Message-ID: <20251110163634.3686676-23-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: rspam05 X-Rspamd-Queue-Id: 9AC194000E X-Stat-Signature: 1rpgxpgjrs4myw658on9z77anfd5bo5c X-Rspam-User: X-HE-Tag: 1762792700-672 X-HE-Meta: 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 DFv6q+m7 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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: Extend the test module with a new test case (test1) that intentionally overflows a local u64 buffer to corrupt the stack canary. Signed-off-by: Jinchao Wang show addr of buf and watch_addr of test case --- mm/kstackwatch/test.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c index 2969564b1a00..b3f363d9e1e8 100644 --- a/mm/kstackwatch/test.c +++ b/mm/kstackwatch/test.c @@ -32,6 +32,22 @@ static void test_watch_fire(void) pr_info("exit of %s\n", __func__); } +static void test_canary_overflow(void) +{ + u64 buffer[BUFFER_SIZE]; + + pr_info("entry of %s\n", __func__); + ksw_watch_show(); + pr_info("buf: 0x%px\n", buffer); + + /* intentionally overflow */ + for (int i = BUFFER_SIZE; i < BUFFER_SIZE + 10; i++) + buffer[i] = 0xdeadbeefdeadbeef; + 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) { @@ -54,6 +70,9 @@ static ssize_t test_dbgfs_write(struct file *file, const char __user *buffer, case 0: test_watch_fire(); break; + case 1: + test_canary_overflow(); + break; default: pr_err("Unknown test number %d\n", test_num); return -EINVAL; @@ -74,7 +93,8 @@ static ssize_t test_dbgfs_read(struct file *file, char __user *buffer, "============ usage ===============\n" "Usage:\n" "echo test{i} > /sys/kernel/debug/kstackwatch/test\n" - " test0 - test watch fire\n"; + " test0 - test watch fire\n" + " test1 - test canary overflow\n"; return simple_read_from_buffer(buffer, count, ppos, usage, strlen(usage)); -- 2.43.0