linux-kernel - [PATCH 16/17] tools/kstackwatch: add interactive test script for KStackWatch

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Message-ID: <20250828073311.1116593-17-wangjinchao600@gmail.com>
Date: Thu, 28 Aug 2025 15:32:49 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	"Naveen N . Rao" <naveen@...nel.org>,
	linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Jinchao Wang <wangjinchao600@...il.com>
Subject: [PATCH 16/17] tools/kstackwatch: add interactive test script for KStackWatch

Introduce kstackwatch_test.sh, a shell script to facilitate running various
test scenarios interactively or via command-line arguments.

Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
---
 tools/kstackwatch/kstackwatch_test.sh | 118 ++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 tools/kstackwatch/kstackwatch_test.sh

diff --git a/tools/kstackwatch/kstackwatch_test.sh b/tools/kstackwatch/kstackwatch_test.sh
new file mode 100644
index 000000000000..af0fbdb3a975
--- /dev/null
+++ b/tools/kstackwatch/kstackwatch_test.sh
@@ -0,0 +1,118 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# --- Usage function ---
+usage() {
+	echo "======================================"
+	echo "  KStackWatch Test Script Usage"
+	echo "======================================"
+	echo ""
+	echo "IMPORTANT: Before running, make sure you have updated the offset values!"
+	echo ""
+	echo "To find your offsets, use objdump:"
+	echo "  objdump -S --disassemble=canary_test_write vmlinux"
+	echo ""
+	echo "Then search for your function names to find the instruction addresses."
+	echo "- Instruction offset: address relative to function's start"
+	echo "- Stack var offset: distance from stack base (%rbp) to the variable"
+	echo ""
+	echo "Usage: $0 [test_case_number]"
+	echo ""
+	echo "Available test cases:"
+	echo "  0  - Canary Write Test"
+	echo "  1  - Canary Overflow Test"
+	echo "  2  - Silient Corruption Test"
+	echo "  3  - Recursive Corruption Test"
+	echo ""
+	echo "======================================"
+	echo ""
+}
+
+# --- Interactive menu ---
+show_menu() {
+	echo "Select a test case to run:"
+	echo "  0) Canary Write Test"
+	echo "  1) Canary Overflow Test"
+	echo "  2) Silient Corruption Test"
+	echo "  3) Recursive Corruption Test"
+	echo "  q) Quit"
+	echo ""
+	echo "WARNING: Each test may cause system crash/hang!"
+	echo ""
+	read -p "Enter your choice [0-3/q]: " choice
+	echo ""
+
+	case "$choice" in
+	0) test0 ;;
+	1) test1 ;;
+	2) test2 ;;
+	3) test3 ;;
+	q | Q)
+		echo "Exiting..."
+		exit 0
+		;;
+	*)
+		echo "Invalid choice. Please try again."
+		echo ""
+		show_menu
+		;;
+	esac
+}
+
+# --- Test Case 0: Canary Write ---
+test0() {
+	echo "=== Running Test Case 0: Canary Write ==="
+	# function+instruction_off[+depth] [local_var_offset:local_var_len]
+	echo "canary_test_write+0x12" >/proc/kstackwatch
+	echo "test0" >/proc/kstackwatch_test
+	echo >/proc/kstackwatch
+}
+
+# --- Test Case 1: Canary Overflow ---
+test1() {
+	echo "=== Running Test Case 1: Canary Overflow ==="
+	# function+instruction_off[+depth] [local_var_offset:local_var_len]
+	echo "canary_test_overflow+0x12" >/proc/kstackwatch
+	echo "test1" >/proc/kstackwatch_test
+	echo >/proc/kstackwatch
+
+}
+
+# --- Test Case 2: Silient Corruption ---
+test2() {
+	echo "=== Running Test Case 2: Silient Corruption ==="
+	# function+instruction_off[+depth] [local_var_offset:local_var_len]
+	echo "silent_corruption_hapless+0x7f 0:8" >/proc/kstackwatch
+	echo "test2" >/proc/kstackwatch_test
+	echo >/proc/kstackwatch
+}
+
+# --- Test Case 3: Recursive Corruption ---
+test3() {
+	echo "=== Running Test Case 3: Recursive Corruption ==="
+	# function+instruction_off[+depth] [local_var_offset:local_var_len]
+	echo "recursive_corruption_test+0x1b+3 0:8" >/proc/kstackwatch
+	echo "test3" >/proc/kstackwatch_test
+	echo >/proc/kstackwatch
+}
+
+# --- Main ---
+if [ -z "$1" ]; then
+	usage
+	echo ""
+	show_menu
+else
+	case "$1" in
+	0) test0 ;;
+	1) test1 ;;
+	2) test2 ;;
+	3) test3 ;;
+	help | --help | -h) usage ;;
+	*)
+		echo "Error: Invalid argument '$1'"
+		echo ""
+		usage
+		exit 1
+		;;
+	esac
+fi
-- 
2.43.0