Lab1

tools/labs/skels/Kbuild

@@ -0,0 +1,10 @@
+# autogenerated, do not edit 
+ccflags-y += -Wno-unused-function -Wno-unused-label -Wno-unused-variable 
+obj-m += ./kernel_modules/1-2-test-mod/
+obj-m += ./kernel_modules/5-oops-mod/
+obj-m += ./kernel_modules/9-dyndbg/
+obj-m += ./kernel_modules/8-kdb/
+obj-m += ./kernel_modules/4-multi-mod/
+obj-m += ./kernel_modules/3-error-mod/
+obj-m += ./kernel_modules/6-cmd-mod/
+obj-m += ./kernel_modules/7-list-proc/

tools/labs/skels/kernel_modules/1-2-test-mod/Kbuild

@@ -0,0 +1,3 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable -DDEBUG
+
+obj-m = hello_mod.o

tools/labs/skels/kernel_modules/1-2-test-mod/ex1-2.txt

@@ -0,0 +1 @@
+la 2 am dat comanda echo 5 > /proc/sys/kernel/printk pentru a modifica nivelul de log

tools/labs/skels/kernel_modules/1-2-test-mod/hello_mod.c

@@ -0,0 +1,21 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+MODULE_DESCRIPTION("Simple module");
+MODULE_AUTHOR("Kernel Hacker");
+MODULE_LICENSE("GPL");
+
+static int my_hello_init(void)
+{
+	pr_debug("Hello!\n");
+	return 0;
+}
+
+static void hello_exit(void)
+{
+	pr_debug("Goodbye!\n");
+}
+
+module_init(my_hello_init);
+module_exit(hello_exit);

tools/labs/skels/kernel_modules/3-error-mod/Kbuild

@@ -0,0 +1,3 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable
+
+obj-m = err_mod.o

tools/labs/skels/kernel_modules/3-error-mod/err_mod.c

@@ -0,0 +1,26 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+/* TODO: add missing kernel headers */
+
+MODULE_DESCRIPTION("Error module");
+MODULE_AUTHOR("Kernel Hacker");
+MODULE_LICENSE("GPL");
+
+static int n1, n2;
+
+static int err_init(void)
+{
+	n1 = 1; n2 = 2;
+	pr_info("n1 is %d, n2 is %d\n", n1, n2);
+
+	return 0;
+}
+
+static void err_exit(void)
+{
+	pr_info("sum is %d\n", n1 + n2);
+}
+
+module_init(err_init);
+module_exit(err_exit);

tools/labs/skels/kernel_modules/4-multi-mod/Kbuild

@@ -0,0 +1,5 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable
+
+# TODO: add rules to create a multi object module
+obj-m = multi-mod.o
+multi-mod-y = mod1.o mod2.o

tools/labs/skels/kernel_modules/4-multi-mod/mod1.c

@@ -0,0 +1,27 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+MODULE_DESCRIPTION("Multi-file module");
+MODULE_AUTHOR("Kernel Hacker");
+MODULE_LICENSE("GPL");
+
+extern int add(int a, int b);
+
+static int n1, n2;
+
+static int my_hello_init(void)
+{
+	n1 = 1; n2 = 2;
+	pr_info("n1 is %d, n2 is %d\n", n1, n2);
+
+	return 0;
+}
+
+static void hello_exit(void)
+{
+	pr_info("sum is %d\n", add(n1, n2));
+}
+
+module_init(my_hello_init);
+module_exit(hello_exit);

tools/labs/skels/kernel_modules/4-multi-mod/mod2.c

@@ -0,0 +1,4 @@
+int add(int a, int b)
+{
+	return a + b;
+}

tools/labs/skels/kernel_modules/5-oops-mod/Kbuild

@@ -0,0 +1,4 @@
+# TODO: add flags to generate debug information
+ccflags-y = -g
+
+obj-m = oops_mod.o

tools/labs/skels/kernel_modules/5-oops-mod/oops_mod.c

@@ -0,0 +1,27 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+MODULE_DESCRIPTION("Oops generating module");
+MODULE_AUTHOR("So2rul Esforever");
+MODULE_LICENSE("GPL");
+
+static int my_oops_init(void)
+{
+	char *p = 0;
+
+	pr_info("before init\n");
+	*p = 'a';
+	pr_info("after init\n");
+
+	return 0;
+}
+
+static void my_oops_exit(void)
+{
+	pr_info("module goes all out\n");
+}
+
+module_init(my_oops_init);
+module_exit(my_oops_exit);

tools/labs/skels/kernel_modules/6-cmd-mod/Kbuild

@@ -0,0 +1,3 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable
+
+obj-m = cmd_mod.o

tools/labs/skels/kernel_modules/6-cmd-mod/cmd_mod.c

@@ -0,0 +1,26 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+MODULE_DESCRIPTION("Command-line args module");
+MODULE_AUTHOR("Kernel Hacker");
+MODULE_LICENSE("GPL");
+
+static char *str = "the worm";
+
+module_param(str, charp, 0000);
+MODULE_PARM_DESC(str, "A simple string");
+
+static int __init cmd_init(void)
+{
+	pr_info("Early bird gets %s\n", str);
+	return 0;
+}
+
+static void __exit cmd_exit(void)
+{
+	pr_info("Exit, stage left\n");
+}
+
+module_init(cmd_init);
+module_exit(cmd_exit);

tools/labs/skels/kernel_modules/6-cmd-mod/ex6.txt

@@ -0,0 +1 @@
+insmod cmd_mod.ko str="Early bird gets tired."

tools/labs/skels/kernel_modules/7-list-proc/Kbuild

@@ -0,0 +1,3 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable
+
+obj-m = list_proc.o

tools/labs/skels/kernel_modules/7-list-proc/list_proc.c

@@ -0,0 +1,35 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+/* TODO: add missing headers */
+#include <linux/sched/signal.h>
+
+MODULE_DESCRIPTION("List current processes");
+MODULE_AUTHOR("Kernel Hacker");
+MODULE_LICENSE("GPL");
+
+static int my_proc_init(void)
+{
+	struct task_struct *p;
+
+	/* TODO: print current process pid and its name */
+
+	pr_info("Current process: pid = %d, name = %s\n", current->pid, current->comm);
+
+	/* TODO: print the pid and name of all processes */
+	for_each_process(p) {
+		pr_info("pid = %d, name = %s\n", p->pid, p->comm);
+	}
+
+	return 0;
+}
+
+static void my_proc_exit(void)
+{
+	/* TODO: print current process pid and name */
+
+	pr_info("Current process: pid = %d, name = %s\n", current->pid, current->comm);
+}
+
+module_init(my_proc_init);
+module_exit(my_proc_exit);

tools/labs/skels/kernel_modules/8-kdb/Kbuild

@@ -0,0 +1,3 @@
+ccflags-y = -Wno-unused-function -Wno-unused-label -Wno-unused-variable
+
+obj-m        = hello_kdb.o

tools/labs/skels/kernel_modules/8-kdb/hello_kdb.c

@@ -0,0 +1,142 @@
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+int kdb_write_address;
+EXPORT_SYMBOL(kdb_write_address);
+
+noinline void dummy_func18(void)
+{
+	panic("Hello KDB has paniced!");
+}
+noinline void dummy_func17(void)
+{
+	dummy_func18();
+}
+noinline void dummy_func16(void)
+{
+	dummy_func17();
+}
+noinline void dummy_func15(void)
+{
+	dummy_func16();
+}
+noinline void dummy_func14(void)
+{
+	dummy_func15();
+}
+noinline void dummy_func13(void)
+{
+	dummy_func14();
+}
+noinline void dummy_func12(void)
+{
+	dummy_func13();
+}
+noinline void dummy_func11(void)
+{
+	dummy_func12();
+}
+noinline void dummy_func10(void)
+{
+	dummy_func11();
+}
+noinline void dummy_func9(void)
+{
+	dummy_func10();
+}
+noinline void dummy_func8(void)
+{
+	dummy_func9();
+}
+noinline void dummy_func7(void)
+{
+	dummy_func8();
+}
+noinline void dummy_func6(void)
+{
+	dummy_func7();
+}
+noinline void dummy_func5(void)
+{
+	dummy_func6();
+}
+noinline void dummy_func4(void)
+{
+	dummy_func5();
+}
+noinline void dummy_func3(void)
+{
+	dummy_func4();
+}
+noinline void dummy_func2(void)
+{
+	dummy_func3();
+}
+noinline void dummy_func1(void)
+{
+	dummy_func2();
+}
+
+static int hello_proc_show(struct seq_file *m, void *v) {
+	seq_printf(m, "Hello proc!\n");
+	return 0;
+}
+
+static int hello_proc_open(struct inode *inode, struct  file *file) {
+	return single_open(file, hello_proc_show, NULL);
+}
+
+static int edit_write(struct file *file, const char *buffer,
+		size_t count, loff_t *data)
+{
+	kdb_write_address += 1;
+	return count;
+}
+
+static int bug_write(struct file *file, const char *buffer,
+		size_t count, loff_t *data)
+{
+	dummy_func1();
+	return count;
+}
+
+static const struct proc_ops edit_proc_ops = {
+	.proc_open	= hello_proc_open,
+	.proc_read	= seq_read,
+	.proc_write	= edit_write,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+};
+
+static const struct proc_ops bug_proc_ops = {
+	.proc_open	= hello_proc_open,
+	.proc_read	= seq_read,
+	.proc_write	= bug_write,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+};
+
+static int __init hello_proc_init(void) {
+	struct proc_dir_entry *file;
+	file = proc_create("hello_kdb_bug", 0, NULL, &bug_proc_ops);
+	if (file == NULL) {
+		return -ENOMEM;
+	}
+
+	file = proc_create("hello_kdb_break", 0, NULL, &edit_proc_ops);
+	if (file == NULL) {
+		remove_proc_entry("hello_kdb_bug", NULL);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static void __exit hello_proc_exit(void) {
+	remove_proc_entry("hello_kdb_bug", NULL);
+	remove_proc_entry("hello_kdb_break", NULL);
+}
+
+MODULE_LICENSE("GPL");
+module_init(hello_proc_init);
+module_exit(hello_proc_exit);

tools/labs/skels/kernel_modules/9-dyndbg/Kbuild

@@ -0,0 +1,3 @@
+EXTRA_CFLAGS = -Wall -g
+
+obj-m        = dyndbg.o

tools/labs/skels/kernel_modules/9-dyndbg/dyndbg.c

@@ -0,0 +1,32 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+MODULE_DESCRIPTION("Dyndbg kernel module");
+MODULE_AUTHOR("Dyndbg");
+MODULE_LICENSE("GPL");
+
+void my_debug_func(void)
+{
+	pr_debug("Important dyndbg debug message1\n");
+	pr_debug("Important dyndbg debug message2\n");
+	pr_debug("Verbose dyndbg debug message\n");
+}
+EXPORT_SYMBOL(my_debug_func);
+
+
+static int dyndbg_init(void)
+{
+	printk(KERN_INFO "Hi dyndbg!\n" );
+	my_debug_func();
+	return 0;
+}
+
+static void dyndbg_exit(void)
+{
+	printk(KERN_INFO "Bye dyndbg!\n" );
+	my_debug_func();
+}
+
+module_init(dyndbg_init);
+module_exit(dyndbg_exit);