Feat: still great work for the second part of the TP1

.gitignore

+build/
+linux*
+debian*
+.hello-1*
+*.o
+*.cmd
+*.ko
+*.mod
+*.symvers
+*.orders
\ No newline at end of file

kvm-mylinux.sh → kvm-mykernel.sh

 #!/bin/bash
-KERNEL=${1-/home/lipari/Documents/corsi/2023-2024/ASEE/prova/build/kvm/arch/x86/boot/bzImage}
+KERNEL=${1-build/kvm/arch/x86/boot/bzImage}
 SMP=${2-2}
 
 kvm -smp $SMP -m 1G -boot c --enable-kvm \
     -kernel $KERNEL -append "root=/dev/sda1 console=ttyS0 rw" \
     -hda debian.qcow \
-    -net user,hostfwd=tcp::10022-:22 -net nic
+    -net user,hostfwd=tcp::10022-:22 -net nic \
     -serial mon:stdio
 

lkmpg @ c6b02adc

+Subproject commit c6b02adc982382044c86fa11dcaf012fbe78715e

work/hello-1/Makefile

@@ -4,6 +4,7 @@ obj-m += hello-1.o
 obj-m += hello-2.o
 obj-m += hello-3.o
 obj-m += hello-5.o
+obj-m += hello-sysfs.o
 PWD := $(CURDIR) 
 
 all: 

work/hello-1/hello-sysfs.c

+/* 
+ * hello-sysfs.c sysfs example 
+ */ 
+#include <linux/fs.h> 
+#include <linux/init.h> 
+#include <linux/kobject.h> 
+#include <linux/module.h> 
+#include <linux/string.h> 
+#include <linux/sysfs.h> 
+ 
+static struct kobject *mymodule; 
+ 
+/* the variable you want to be able to change */ 
+static int myvariable = 0; 
+ 
+static ssize_t myvariable_show(struct kobject *kobj, 
+                               struct kobj_attribute *attr, char *buf) 
+{ 
+    return sprintf(buf, "%d\n", myvariable); 
+} 
+ 
+static ssize_t myvariable_store(struct kobject *kobj, 
+                                struct kobj_attribute *attr, char *buf, 
+                                size_t count) 
+{ 
+    sscanf(buf, "%du", &myvariable); 
+    return count; 
+} 
+ 
+static struct kobj_attribute myvariable_attribute = 
+    __ATTR(myvariable, 0660, myvariable_show, (void *)myvariable_store); 
+ 
+static int __init mymodule_init(void) 
+{ 
+    int error = 0; 
+ 
+    pr_info("mymodule: initialised\n"); 
+ 
+    mymodule = kobject_create_and_add("mymodule", kernel_kobj); 
+    if (!mymodule) 
+        return -ENOMEM; 
+ 
+    error = sysfs_create_file(mymodule, &myvariable_attribute.attr); 
+    if (error) { 
+        pr_info("failed to create the myvariable file " 
+                "in /sys/kernel/mymodule\n"); 
+    } 
+ 
+    return error; 
+} 
+ 
+static void __exit mymodule_exit(void) 
+{ 
+    pr_info("mymodule: Exit success\n"); 
+    kobject_put(mymodule); 
+} 
+ 
+module_init(mymodule_init); 
+module_exit(mymodule_exit); 
+ 
+MODULE_LICENSE("GPL");
\ No newline at end of file

work/hello-1/hello-sysfs.mod.c

+#include <linux/module.h>
+#define INCLUDE_VERMAGIC
+#include <linux/build-salt.h>
+#include <linux/elfnote-lto.h>
+#include <linux/export-internal.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+#ifdef CONFIG_UNWINDER_ORC
+#include <asm/orc_header.h>
+ORC_HEADER;
+#endif
+
+BUILD_SALT;
+BUILD_LTO_INFO;
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+MODULE_INFO(name, KBUILD_MODNAME);
+
+__visible struct module __this_module
+__section(".gnu.linkonce.this_module") = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+#ifdef CONFIG_RETPOLINE
+MODULE_INFO(retpoline, "Y");
+#endif
+
+
+
+static const struct modversion_info ____versions[]
+__used __section("__versions") = {
+	{ 0x122c3a7e, "_printk" },
+	{ 0xa6ef1646, "kernel_kobj" },
+	{ 0x10bd90f2, "kobject_create_and_add" },
+	{ 0xa3efd5d1, "sysfs_create_file_ns" },
+	{ 0xecc78457, "kobject_put" },
+	{ 0xbdfb6dbb, "__fentry__" },
+	{ 0xbcab6ee6, "sscanf" },
+	{ 0x5b8239ca, "__x86_return_thunk" },
+	{ 0x3c3ff9fd, "sprintf" },
+	{ 0x76800044, "module_layout" },
+};
+
+MODULE_INFO(depends, "");
+
+
+MODULE_INFO(srcversion, "6C30BA4EA53200F485C730C");

work/hello-1/modules.order

@@ -2,3 +2,4 @@
 /root/Desktop/asee/work/hello-1/hello-2.o
 /root/Desktop/asee/work/hello-1/hello-3.o
 /root/Desktop/asee/work/hello-1/hello-5.o
+/root/Desktop/asee/work/hello-1/hello-sysfs.o