[Add] 新增pstore测试模块：test_ps.ko

Kconfig

@@ -30,3 +30,5 @@ source "crypto/Kconfig"
 source "lib/Kconfig"
 
 source "lib/Kconfig.debug"
+
+source "gaoyang3513/Kconfig"

Makefile

@@ -624,6 +624,7 @@ net-y		:= net/
 libs-y		:= lib/
 core-y		:= usr/
 virt-y		:= virt/
+drivers-y	+= gaoyang3513/
 endif # KBUILD_EXTMOD
 
 ifeq ($(dot-config),1)
@@ -1130,6 +1131,7 @@ export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 export LDFLAGS_vmlinux
 # used by scripts/package/Makefile
 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
+export KBUILD_ALLDIRS += $(sort $(KBUILD_ALLDIRS) gaoyang3513)
 
 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 

arch/arm64/configs/lubancat2_defconfig

@@ -798,3 +798,5 @@ CONFIG_RCU_CPU_STALL_TIMEOUT=60
 CONFIG_FUNCTION_TRACER=y
 CONFIG_BLK_DEV_IO_TRACE=y
 CONFIG_LKDTM=y
+
+CONFIG_TESTING_PSTORE=m

gaoyang3513/Kconfig

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+
+menu "Gaoyang3513 Custom"
+
+source "gaoyang3513/testings/Kconfig"
+
+endmenu

gaoyang3513/Makefile

@@ -0,0 +1,2 @@
+
+obj-y += testings/

gaoyang3513/testings/Kconfig

@@ -0,0 +1,8 @@
+#
+# Testings configuration
+#
+
+config TESTING_PSTORE
+	tristate "Testing Pstore"
+	---help---
+        Testing Pstore

gaoyang3513/testings/Makefile

@@ -0,0 +1,2 @@
+
+obj-$(CONFIG_TESTING_PSTORE) += pstore/

gaoyang3513/testings/pstore/Makefile

@@ -0,0 +1,71 @@
+#*******************************************************************************
+# Gaoyang3513 All Right Reserved.
+# Author       :
+# Version      : V1.0.0  202x.xx.xx
+# Description  :
+# Note         : gaoyang3513@163.com     Createe        202x.xx.xx
+#*******************************************************************************
+
+#*******************************************************************************
+# Path information
+#*******************************************************************************
+LOCAL_DIR    := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
+KERNEL_DIR   ?= $(realpath $(LOCAL_DIR)/../../../kernel)
+
+# Subdirectory
+OUTPUT_DIR   := $(LOCAL_DIR)/output
+INSTALL_DIR  ?= $(LOCAL_DIR)/__install
+#$(info Output directoty : $(OUTPUT_DIR))
+#$(info Install directoty: $(INSTALL_DIR))
+
+#*******************************************************************************
+# Variables
+#*******************************************************************************
+MULTI_CORES ?= $(shell grep -c ^processor /proc/cpuinfo)
+
+#*******************************************************************************
+# Compile configure
+#*******************************************************************************
+CC            := $(CROSS_COMPILE)gcc
+LD            := $(CROSS_COMPILE)ld
+AR            := $(CROSS_COMPILE)ar
+STRIP         := $(CROSS_COMPILE)strip
+
+export ARCH CROSS_COMPILE
+#*******************************************************************************
+# Targets
+#*******************************************************************************
+.PHONY: init all clean install
+
+ifeq ($(KERNELRELEASE),)
+all: init
+	@$(MAKE) modules         -C $(KERNEL_DIR) M=$(LOCAL_DIR) -j$(MULTI_CORES)
+	@$(MAKE) modules_install -C $(KERNEL_DIR) M=$(LOCAL_DIR) INSTALL_MOD_PATH=$(KERNEL_DIR)/_install_modules INSTALL_MOD_DIR=private
+
+clean:
+	@for sub in $(SUB_DIRS); do \
+		$(MAKE) clean -C $$sub || exit "$$?"; \
+	done;
+#       Directory
+	@if [ -d $(LOCAL_DIR)/output        ]; then rm -rf $(LOCAL_DIR)/output;        fi;
+	@if [ -d $(LOCAL_DIR)/__install     ]; then rm -rf $(LOCAL_DIR)/__install;     fi;
+	@if [ -d $(LOCAL_DIR)/.tmp_versions ]; then rm -rf $(LOCAL_DIR)/.tmp_versions; fi;
+#       File
+	@for f in {Module.symvers,modules.order}; do \
+		if [ -e $$f ]; then rm -rf $$f; fi; \
+	done
+
+install:
+	@mkdir -p $(INSTALL_DIR)
+	@cp -arf $(OUTPUT_DIR)/. $(INSTALL_DIR)
+
+init:
+	@mkdir -p $(OUTPUT_DIR);
+
+else
+# called from kernel build system: just declare what our modules are
+obj-$(CONFIG_TESTING_PSTORE) += test_ps.o
+
+
+
+endif # ifeq ($(KERNELRELEASE),)

gaoyang3513/testings/pstore/test_ps.c

@@ -0,0 +1,82 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/vmalloc.h>
+#include <linux/rcupdate.h>
+
+static unsigned int test_type;
+module_param(test_type, uint, 0400);
+MODULE_PARM_DESC(test_type, "set to 1 to try to OOM (default 0)");
+
+static int trigger_oops(void)
+{
+    int *ptr = (int *)0;               // 强制类型转换0地址为指针并尝试读取
+
+    printk(KERN_ALERT "Dereferenced NULL pointer value: %d\n", *ptr);
+
+    return 0;
+}
+
+static int trigger_oom(void)
+{
+    void *memory = NULL;
+    size_t memory_size = 0;
+
+    printk(KERN_INFO "oom_trigger: Initializing the oom_trigger LKM\n");
+
+    memory_size = 100*1024*1024;
+    while (1) { // 尝试分配大块内存
+        memory = vmalloc(memory_size);
+        if (!memory) {
+            printk(KERN_ALERT "oom_trigger: Memory allocation failed\n");
+            break;
+        }
+
+        // 仅为防止编译器优化，实际不访问分配的内存
+        memset(memory, 0, memory_size);
+    }
+
+    return 0;
+}
+
+static int test_data = 0;
+static struct rcu_head test_rcu_head;
+
+static void bad_rcu_callback(struct rcu_head *head)
+{
+    // 违规操作：在RCU回调函数中睡眠，这可能导致RCU grace period过长
+    msleep(1000);
+
+    // 违规操作：修改被RCU保护的数据结构
+    test_data++;  // 不应在RCU回调中修改全局变量
+
+    pr_info("Bad RCU callback executed\n");
+}
+
+static void trigger_rcu(void)
+{
+    pr_info("RCU error module loaded\n");
+
+    call_rcu(&test_rcu_head, bad_rcu_callback);
+}
+
+static int trigger_init(void) {
+    if (test_type == 0)
+        trigger_oom();
+    else if (test_type == 1)
+        trigger_oops();
+    else if (test_type == 2)
+        trigger_rcu();
+
+    return 0;           // 加载模块不应该有返回值，但这里返回0避免编译警告。
+}
+
+static void __exit trigger_exit(void) {
+    printk(KERN_INFO "oom_trigger: Exiting the oom_trigger LKM\n");
+}
+
+module_init(trigger_init);
+module_exit(trigger_exit);
+
+MODULE_LICENSE("GPL");