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spectreModule.c
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spectreModule.c
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#define procfs_name "leakSecretByteAddress"
static struct proc_dir_entry *procFIle;
static unsigned char * secret = NULL;
MODULE_AUTHOR("D3fa1t");
MODULE_DESCRIPTION("A simple Linux Driver for testing spectre V1");
MODULE_VERSION("1");
MODULE_LICENSE("GPL");
//more on seq file can be found at https://linux.die.net/lkmpg/x861.html
static void *my_seq_start(struct seq_file *s, loff_t *pos)
{
if ( *pos == 0 )
{
return &secret;
}
else
{
*pos = 0;
return NULL;
}
}
char temp;
static void *my_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
int i= 0;
for( i = 0; i < 10; i++)
{
temp = *((char*)secret+1);
}
return NULL;
}
static void my_seq_stop(struct seq_file *s, void *v)
{
}
static int my_seq_show(struct seq_file *s, void *v)
{
loff_t *spos = (loff_t *) v;
char temp = *((char*)secret+1);
seq_printf(s, "%016p\n", (void*)secret+1);
return 0;
}
static struct seq_operations my_seq_ops={
.start = my_seq_start ,
.next = my_seq_next ,
.stop = my_seq_stop ,
.show = my_seq_show
};
static int my_open(struct inode *inode, struct file *file)
{
return seq_open(file, &my_seq_ops);
};
static struct file_operations ops =
{
.read = seq_read,
.open = my_open,
.owner = THIS_MODULE,
.llseek = seq_lseek,
.release= seq_release
};
int init_module(void){
secret = kmalloc(PAGE_SIZE,GFP_KERNEL);
strcpy(secret+1,"Hack me?"); // Hack me? is the secret string and
//'H' is the secret Byte in kernel space which we are going to extract from user space
printk(KERN_ALERT "spectreKernalModuleInit and secret is at %p \n",secret+1 );
procFIle = proc_create(procfs_name,0660,NULL,&ops);
if(procFIle == NULL){
proc_remove(procFIle);
printk(KERN_ALERT "Error:Could not initialize /proc/%s\n",procfs_name);
return -ENOMEM;
}
return 0 ;
}
void cleanup_module(void){
proc_remove(procFIle);
printk(KERN_ALERT "spectreKernelModuleDestroy \n");
}