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Thu, 09 Oct 2025 03:58:18 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , Marco Elver , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. 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Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v7 18/23] mm/ksw: add stack overflow test Date: Thu, 9 Oct 2025 18:55:54 +0800 Message-ID: <20251009105650.168917-19-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251009105650.168917-1-wangjinchao600@gmail.com> References: <20251009105650.168917-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Stat-Signature: fbx8dbh5jfawkihfjbwkn97iduwjjm1z X-Rspam-User: X-Rspamd-Queue-Id: 006B7C000C X-HE-Tag: 1760007499-228027 X-HE-Meta: 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 eI/PyWio x++7ZO9frdP7JsbxCEXjHXfj7fZ/wQrKwXjhK7mGEGXbd/ZfciwaG8MoUC9nyRdPyHalLXgFXr+XY2QX8CoM8WyPXfVK2nXTngEb85UHGegnPGTnnql2DM4pnM5JsO1LQHVv/Fxs821GHYcGaIpoO9Wmk9eszsoZfWFe/tR5MqG9FsIMwQSmZLnOpWyIXWOl4Ad/aK0MVbje5BhBvG6QRfGAnJHiv4jSGYx/zYgr0bwvhd0QXAVBdRcazQ2E7B2T/byZ14YKD24XFD9nnG0dJq3Vx9MYHo14nSdZRiizw9jqSyIxHtGJmgMcDhmNaUuVLJC/Ito3WjCJr0FU16Fs04en2Vgpdnc1RVpweUa6TN199t//oN31/qN2C4xpQgYy9WdlVMxejShdVQ3dqV8hc/uGliA12oxgDbuzQXyAa7eiQWXV+/0jo5Ozm4KU9pJWx29QS/nwoYXZv7+rs4w2BRUTPHfRsvO+rOhchkQDVUWZG+XxGaSukK6wnvRv/r9Pw/iqISvWrl6ZY8VyboIFQCykoKwyGiKNOXCYKtgsLlpMrZsc5BJ3ol/AXJw== 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 --- mm/kstackwatch/test.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c index 80fec9cf3243..012692c97a50 100644 --- a/mm/kstackwatch/test.c +++ b/mm/kstackwatch/test.c @@ -32,6 +32,20 @@ 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__); + + /* 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 +68,9 @@ 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 +91,8 @@ 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