linux-kernel - [PATCH v5 18/23] mm/ksw: add stack overflow test

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Message-ID: <20250924115931.197077-3-wangjinchao600@gmail.com>
Date: Wed, 24 Sep 2025 19:59:24 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
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Cc: Jinchao Wang <wangjinchao600@...il.com>
Subject: [PATCH v5 18/23] mm/ksw: add stack overflow test

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 <wangjinchao600@...il.com>
---
 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 1ed98931cc51..740e3c11b3ef 100644
--- a/mm/kstackwatch/test.c
+++ b/mm/kstackwatch/test.c
@@ -43,6 +43,20 @@ 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_proc_write(struct file *file, const char __user *buffer,
 			       size_t count, loff_t *pos)
@@ -66,6 +80,9 @@ static ssize_t test_proc_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;
@@ -85,7 +102,8 @@ static ssize_t test_proc_read(struct file *file, char __user *buffer,
 				    "============ usage ==============\n"
 				    "Usage:\n"
 				    "echo test{i} > /proc/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, pos, usage,
 				       strlen(usage));
-- 
2.43.0