kptr_restrict_test

study/debug/filesystem/procfs/kptr_restrict/Makefile

@@ -0,0 +1,81 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+ROOT=..
+#PLATFORM=$(shell $(ROOT)/systype.sh)
+#include $(ROOT)/Make.defines.$(PLATFORM)
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := kptr_restrict_test
+EXTRA_CFLAGS  += -g
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+
+
+
+obj-m := $(MODULE_NAME).o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	cat /sys/kernel/debug/mydebug/a
+	cat /sys/kernel/debug/mydebug/b
+	cat /sys/kernel/debug/mydebug/subdir/c
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+

study/debug/filesystem/procfs/kptr_restrict/kptr_restrict_test.c

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+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <linux/percpu.h>
+#include <linux/sched.h>
+#include <linux/version.h>
+
+
+#define SIZE 10
+int array[SIZE];
+
+int *p_arr = array;
+static int __init exam_seq_init(void)
+{
+	pr_info("%%p = %p, %%pK = %pK, %%px = %px\n", p_arr, p_arr, p_arr);
+	pr_info("%%p = %p, %%pK = %pK, %%px = %px\n", &p_arr, &p_arr, &p_arr);
+
+	return 0;
+}
+
+static void __exit exam_seq_exit(void)
+{
+
+}
+
+module_init(exam_seq_init);
+module_exit(exam_seq_exit);
+MODULE_LICENSE("GPL");

study/debug/filesystem/procfs/kptr_restrict/test.sh

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+#!/bin/bash
+
+dmesg -c
+
+
+for kptr in `seq 0 2`
+do
+	echo $kptr > /proc/sys/kernel/kptr_restrict
+	KPTR=`cat /proc/sys/kernel/kptr_restrict`
+	echo "/proc/sys/kernel/kptr_restrict: $KPTR"
+	insmod ./kptr_restrict_test.ko
+	dmesg -c
+	rmmod ./kptr_restrict_test.ko
+done