FreeBSD/Linux Kernel Cross Reference
sys/security/dummy.c

     /*
      * Stub functions for the default security function pointers in case no
      * security model is loaded.
      *
      * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
      * Copyright (C) 2001-2002  Greg Kroah-Hartman <greg@kroah.com>
      * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
      *
      *      This program is free software; you can redistribute it and/or modify
     *      it under the terms of the GNU General Public License as published by
     *      the Free Software Foundation; either version 2 of the License, or
     *      (at your option) any later version.
     */
    
    #undef DEBUG
    
    #include <linux/capability.h>
    #include <linux/kernel.h>
    #include <linux/mman.h>
    #include <linux/pagemap.h>
    #include <linux/swap.h>
    #include <linux/security.h>
    #include <linux/skbuff.h>
    #include <linux/netlink.h>
    #include <net/sock.h>
    #include <linux/xattr.h>
    #include <linux/hugetlb.h>
    #include <linux/ptrace.h>
    #include <linux/file.h>
    #include <linux/prctl.h>
    #include <linux/securebits.h>
    
    static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
    {
            return 0;
    }
    
    static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
                             kernel_cap_t * inheritable, kernel_cap_t * permitted)
    {
            if (target->euid == 0) {
                    cap_set_full(*permitted);
                    cap_set_init_eff(*effective);
            } else {
                    cap_clear(*permitted);
                    cap_clear(*effective);
            }
    
            cap_clear(*inheritable);
    
            if (target->fsuid != 0) {
                    *permitted = cap_drop_fs_set(*permitted);
                    *effective = cap_drop_fs_set(*effective);
            }
            return 0;
    }
    
    static int dummy_capset_check (struct task_struct *target,
                                   kernel_cap_t * effective,
                                   kernel_cap_t * inheritable,
                                   kernel_cap_t * permitted)
    {
            return -EPERM;
    }
    
    static void dummy_capset_set (struct task_struct *target,
                                  kernel_cap_t * effective,
                                  kernel_cap_t * inheritable,
                                  kernel_cap_t * permitted)
    {
            return;
    }
    
    static int dummy_acct (struct file *file)
    {
            return 0;
    }
    
    static int dummy_capable (struct task_struct *tsk, int cap)
    {
            if (cap_raised (tsk->cap_effective, cap))
                    return 0;
            return -EPERM;
    }
    
    static int dummy_sysctl (ctl_table * table, int op)
    {
            return 0;
    }
    
    static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
    {
            return 0;
    }
    
    static int dummy_quota_on (struct dentry *dentry)
    {
            return 0;
    }
   
   static int dummy_syslog (int type)
   {
           if ((type != 3 && type != 10) && current->euid)
                   return -EPERM;
           return 0;
   }
   
   static int dummy_settime(struct timespec *ts, struct timezone *tz)
   {
           if (!capable(CAP_SYS_TIME))
                   return -EPERM;
           return 0;
   }
   
   static int dummy_vm_enough_memory(struct mm_struct *mm, long pages)
   {
           int cap_sys_admin = 0;
   
           if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
                   cap_sys_admin = 1;
           return __vm_enough_memory(mm, pages, cap_sys_admin);
   }
   
   static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
   {
           return 0;
   }
   
   static void dummy_bprm_free_security (struct linux_binprm *bprm)
   {
           return;
   }
   
   static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
   {
           if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
                   set_dumpable(current->mm, suid_dumpable);
   
                   if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
                           bprm->e_uid = current->uid;
                           bprm->e_gid = current->gid;
                   }
           }
   
           current->suid = current->euid = current->fsuid = bprm->e_uid;
           current->sgid = current->egid = current->fsgid = bprm->e_gid;
   
           dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
   }
   
   static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
   {
           return;
   }
   
   static int dummy_bprm_set_security (struct linux_binprm *bprm)
   {
           return 0;
   }
   
   static int dummy_bprm_check_security (struct linux_binprm *bprm)
   {
           return 0;
   }
   
   static int dummy_bprm_secureexec (struct linux_binprm *bprm)
   {
           /* The new userland will simply use the value provided
              in the AT_SECURE field to decide whether secure mode
              is required.  Hence, this logic is required to preserve
              the legacy decision algorithm used by the old userland. */
           return (current->euid != current->uid ||
                   current->egid != current->gid);
   }
   
   static int dummy_sb_alloc_security (struct super_block *sb)
   {
           return 0;
   }
   
   static void dummy_sb_free_security (struct super_block *sb)
   {
           return;
   }
   
   static int dummy_sb_copy_data (char *orig, char *copy)
   {
           return 0;
   }
   
   static int dummy_sb_kern_mount (struct super_block *sb, void *data)
   {
           return 0;
   }
   
   static int dummy_sb_statfs (struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_sb_mount (char *dev_name, struct path *path, char *type,
                              unsigned long flags, void *data)
   {
           return 0;
   }
   
   static int dummy_sb_check_sb (struct vfsmount *mnt, struct path *path)
   {
           return 0;
   }
   
   static int dummy_sb_umount (struct vfsmount *mnt, int flags)
   {
           return 0;
   }
   
   static void dummy_sb_umount_close (struct vfsmount *mnt)
   {
           return;
   }
   
   static void dummy_sb_umount_busy (struct vfsmount *mnt)
   {
           return;
   }
   
   static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
                                      void *data)
   {
           return;
   }
   
   
   static void dummy_sb_post_addmount (struct vfsmount *mnt, struct path *path)
   {
           return;
   }
   
   static int dummy_sb_pivotroot (struct path *old_path, struct path *new_path)
   {
           return 0;
   }
   
   static void dummy_sb_post_pivotroot (struct path *old_path, struct path *new_path)
   {
           return;
   }
   
   static int dummy_sb_get_mnt_opts(const struct super_block *sb,
                                    struct security_mnt_opts *opts)
   {
           security_init_mnt_opts(opts);
           return 0;
   }
   
   static int dummy_sb_set_mnt_opts(struct super_block *sb,
                                    struct security_mnt_opts *opts)
   {
           if (unlikely(opts->num_mnt_opts))
                   return -EOPNOTSUPP;
           return 0;
   }
   
   static void dummy_sb_clone_mnt_opts(const struct super_block *oldsb,
                                       struct super_block *newsb)
   {
           return;
   }
   
   static int dummy_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
   {
           return 0;
   }
   
   static int dummy_inode_alloc_security (struct inode *inode)
   {
           return 0;
   }
   
   static void dummy_inode_free_security (struct inode *inode)
   {
           return;
   }
   
   static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
                                         char **name, void **value, size_t *len)
   {
           return -EOPNOTSUPP;
   }
   
   static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
                                  int mask)
   {
           return 0;
   }
   
   static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
                                struct dentry *new_dentry)
   {
           return 0;
   }
   
   static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
                                   const char *name)
   {
           return 0;
   }
   
   static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
                                 int mask)
   {
           return 0;
   }
   
   static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
                                 int mode, dev_t dev)
   {
           return 0;
   }
   
   static int dummy_inode_rename (struct inode *old_inode,
                                  struct dentry *old_dentry,
                                  struct inode *new_inode,
                                  struct dentry *new_dentry)
   {
           return 0;
   }
   
   static int dummy_inode_readlink (struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_follow_link (struct dentry *dentry,
                                       struct nameidata *nameidata)
   {
           return 0;
   }
   
   static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
   {
           return 0;
   }
   
   static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
   {
           return 0;
   }
   
   static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
   {
           return 0;
   }
   
   static void dummy_inode_delete (struct inode *ino)
   {
           return;
   }
   
   static int dummy_inode_setxattr (struct dentry *dentry, const char *name,
                                    const void *value, size_t size, int flags)
   {
           if (!strncmp(name, XATTR_SECURITY_PREFIX,
                        sizeof(XATTR_SECURITY_PREFIX) - 1) &&
               !capable(CAP_SYS_ADMIN))
                   return -EPERM;
           return 0;
   }
   
   static void dummy_inode_post_setxattr (struct dentry *dentry, const char *name,
                                          const void *value, size_t size,
                                          int flags)
   {
   }
   
   static int dummy_inode_getxattr (struct dentry *dentry, const char *name)
   {
           return 0;
   }
   
   static int dummy_inode_listxattr (struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_removexattr (struct dentry *dentry, const char *name)
   {
           if (!strncmp(name, XATTR_SECURITY_PREFIX,
                        sizeof(XATTR_SECURITY_PREFIX) - 1) &&
               !capable(CAP_SYS_ADMIN))
                   return -EPERM;
           return 0;
   }
   
   static int dummy_inode_need_killpriv(struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_killpriv(struct dentry *dentry)
   {
           return 0;
   }
   
   static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
   {
           return -EOPNOTSUPP;
   }
   
   static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
   {
           return -EOPNOTSUPP;
   }
   
   static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
   {
           return 0;
   }
   
   static void dummy_inode_getsecid(const struct inode *inode, u32 *secid)
   {
           *secid = 0;
   }
   
   static int dummy_file_permission (struct file *file, int mask)
   {
           return 0;
   }
   
   static int dummy_file_alloc_security (struct file *file)
   {
           return 0;
   }
   
   static void dummy_file_free_security (struct file *file)
   {
           return;
   }
   
   static int dummy_file_ioctl (struct file *file, unsigned int command,
                                unsigned long arg)
   {
           return 0;
   }
   
   static int dummy_file_mmap (struct file *file, unsigned long reqprot,
                               unsigned long prot,
                               unsigned long flags,
                               unsigned long addr,
                               unsigned long addr_only)
   {
           if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
                   return -EACCES;
           return 0;
   }
   
   static int dummy_file_mprotect (struct vm_area_struct *vma,
                                   unsigned long reqprot,
                                   unsigned long prot)
   {
           return 0;
   }
   
   static int dummy_file_lock (struct file *file, unsigned int cmd)
   {
           return 0;
   }
   
   static int dummy_file_fcntl (struct file *file, unsigned int cmd,
                                unsigned long arg)
   {
           return 0;
   }
   
   static int dummy_file_set_fowner (struct file *file)
   {
           return 0;
   }
   
   static int dummy_file_send_sigiotask (struct task_struct *tsk,
                                         struct fown_struct *fown, int sig)
   {
           return 0;
   }
   
   static int dummy_file_receive (struct file *file)
   {
           return 0;
   }
   
   static int dummy_dentry_open (struct file *file)
   {
           return 0;
   }
   
   static int dummy_task_create (unsigned long clone_flags)
   {
           return 0;
   }
   
   static int dummy_task_alloc_security (struct task_struct *p)
   {
           return 0;
   }
   
   static void dummy_task_free_security (struct task_struct *p)
   {
           return;
   }
   
   static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
   {
           return 0;
   }
   
   static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
   {
           dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
           return 0;
   }
   
   static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
   {
           return 0;
   }
   
   static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
   {
           return 0;
   }
   
   static int dummy_task_getpgid (struct task_struct *p)
   {
           return 0;
   }
   
   static int dummy_task_getsid (struct task_struct *p)
   {
           return 0;
   }
   
   static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
   {
           *secid = 0;
   }
   
   static int dummy_task_setgroups (struct group_info *group_info)
   {
           return 0;
   }
   
   static int dummy_task_setnice (struct task_struct *p, int nice)
   {
           return 0;
   }
   
   static int dummy_task_setioprio (struct task_struct *p, int ioprio)
   {
           return 0;
   }
   
   static int dummy_task_getioprio (struct task_struct *p)
   {
           return 0;
   }
   
   static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
   {
           return 0;
   }
   
   static int dummy_task_setscheduler (struct task_struct *p, int policy,
                                       struct sched_param *lp)
   {
           return 0;
   }
   
   static int dummy_task_getscheduler (struct task_struct *p)
   {
           return 0;
   }
   
   static int dummy_task_movememory (struct task_struct *p)
   {
           return 0;
   }
   
   static int dummy_task_wait (struct task_struct *p)
   {
           return 0;
   }
   
   static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
                               int sig, u32 secid)
   {
           return 0;
   }
   
   static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
                                unsigned long arg4, unsigned long arg5, long *rc_p)
   {
           switch (option) {
           case PR_CAPBSET_READ:
                   *rc_p = (cap_valid(arg2) ? 1 : -EINVAL);
                   break;
           case PR_GET_KEEPCAPS:
                   *rc_p = issecure(SECURE_KEEP_CAPS);
                   break;
           case PR_SET_KEEPCAPS:
                   if (arg2 > 1)
                           *rc_p = -EINVAL;
                   else if (arg2)
                           current->securebits |= issecure_mask(SECURE_KEEP_CAPS);
                   else
                           current->securebits &=
                                   ~issecure_mask(SECURE_KEEP_CAPS);
                   break;
           default:
                   return 0;
           }
   
           return 1;
   }
   
   static void dummy_task_reparent_to_init (struct task_struct *p)
   {
           p->euid = p->fsuid = 0;
           return;
   }
   
   static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
   { }
   
   static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
   {
           return 0;
   }
   
   static void dummy_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
   {
           *secid = 0;
   }
   
   static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
   {
           return 0;
   }
   
   static void dummy_msg_msg_free_security (struct msg_msg *msg)
   {
           return;
   }
   
   static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
   {
           return 0;
   }
   
   static void dummy_msg_queue_free_security (struct msg_queue *msq)
   {
           return;
   }
   
   static int dummy_msg_queue_associate (struct msg_queue *msq, 
                                         int msqflg)
   {
           return 0;
   }
   
   static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
   {
           return 0;
   }
   
   static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
                                      int msgflg)
   {
           return 0;
   }
   
   static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
                                      struct task_struct *target, long type,
                                      int mode)
   {
           return 0;
   }
   
   static int dummy_shm_alloc_security (struct shmid_kernel *shp)
   {
           return 0;
   }
   
   static void dummy_shm_free_security (struct shmid_kernel *shp)
   {
           return;
   }
   
   static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
   {
           return 0;
   }
   
   static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
   {
           return 0;
   }
   
   static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
                               int shmflg)
   {
           return 0;
   }
   
   static int dummy_sem_alloc_security (struct sem_array *sma)
   {
           return 0;
   }
   
   static void dummy_sem_free_security (struct sem_array *sma)
   {
           return;
   }
   
   static int dummy_sem_associate (struct sem_array *sma, int semflg)
   {
           return 0;
   }
   
   static int dummy_sem_semctl (struct sem_array *sma, int cmd)
   {
           return 0;
   }
   
   static int dummy_sem_semop (struct sem_array *sma, 
                               struct sembuf *sops, unsigned nsops, int alter)
   {
           return 0;
   }
   
   static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
   {
           NETLINK_CB(skb).eff_cap = current->cap_effective;
           return 0;
   }
   
   static int dummy_netlink_recv (struct sk_buff *skb, int cap)
   {
           if (!cap_raised (NETLINK_CB (skb).eff_cap, cap))
                   return -EPERM;
           return 0;
   }
   
   #ifdef CONFIG_SECURITY_NETWORK
   static int dummy_unix_stream_connect (struct socket *sock,
                                         struct socket *other,
                                         struct sock *newsk)
   {
           return 0;
   }
   
   static int dummy_unix_may_send (struct socket *sock,
                                   struct socket *other)
   {
           return 0;
   }
   
   static int dummy_socket_create (int family, int type,
                                   int protocol, int kern)
   {
           return 0;
   }
   
   static int dummy_socket_post_create (struct socket *sock, int family, int type,
                                        int protocol, int kern)
   {
           return 0;
   }
   
   static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
                                 int addrlen)
   {
           return 0;
   }
   
   static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
                                    int addrlen)
   {
           return 0;
   }
   
   static int dummy_socket_listen (struct socket *sock, int backlog)
   {
           return 0;
   }
   
   static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
   {
           return 0;
   }
   
   static void dummy_socket_post_accept (struct socket *sock, 
                                         struct socket *newsock)
   {
           return;
   }
   
   static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
                                    int size)
   {
           return 0;
   }
   
   static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
                                    int size, int flags)
   {
           return 0;
   }
   
   static int dummy_socket_getsockname (struct socket *sock)
   {
           return 0;
   }
   
   static int dummy_socket_getpeername (struct socket *sock)
   {
           return 0;
   }
   
   static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
   {
           return 0;
   }
   
   static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
   {
           return 0;
   }
   
   static int dummy_socket_shutdown (struct socket *sock, int how)
   {
           return 0;
   }
   
   static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
   {
           return 0;
   }
   
   static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optval,
                                             int __user *optlen, unsigned len)
   {
           return -ENOPROTOOPT;
   }
   
   static int dummy_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
   {
           return -ENOPROTOOPT;
   }
   
   static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t priority)
   {
           return 0;
   }
   
   static inline void dummy_sk_free_security (struct sock *sk)
   {
   }
   
   static inline void dummy_sk_clone_security (const struct sock *sk, struct sock *newsk)
   {
   }
   
   static inline void dummy_sk_getsecid(struct sock *sk, u32 *secid)
   {
   }
   
   static inline void dummy_sock_graft(struct sock* sk, struct socket *parent)
   {
   }
   
   static inline int dummy_inet_conn_request(struct sock *sk,
                           struct sk_buff *skb, struct request_sock *req)
   {
           return 0;
   }
   
   static inline void dummy_inet_csk_clone(struct sock *newsk,
                           const struct request_sock *req)
   {
   }
   
   static inline void dummy_inet_conn_established(struct sock *sk,
                           struct sk_buff *skb)
   {
   }
   
   static inline void dummy_req_classify_flow(const struct request_sock *req,
                           struct flowi *fl)
   {
   }
   #endif  /* CONFIG_SECURITY_NETWORK */
   
   #ifdef CONFIG_SECURITY_NETWORK_XFRM
   static int dummy_xfrm_policy_alloc_security(struct xfrm_sec_ctx **ctxp,
                                               struct xfrm_user_sec_ctx *sec_ctx)
   {
           return 0;
   }
   
   static inline int dummy_xfrm_policy_clone_security(struct xfrm_sec_ctx *old_ctx,
                                              struct xfrm_sec_ctx **new_ctxp)
   {
           return 0;
   }
   
   static void dummy_xfrm_policy_free_security(struct xfrm_sec_ctx *ctx)
   {
   }
   
   static int dummy_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx)
   {
           return 0;
   }
   
   static int dummy_xfrm_state_alloc_security(struct xfrm_state *x,
           struct xfrm_user_sec_ctx *sec_ctx, u32 secid)
   {
           return 0;
   }
   
   static void dummy_xfrm_state_free_security(struct xfrm_state *x)
   {
   }
   
   static int dummy_xfrm_state_delete_security(struct xfrm_state *x)
   {
           return 0;
   }
   
   static int dummy_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx,
                                       u32 sk_sid, u8 dir)
   {
           return 0;
   }
   
   static int dummy_xfrm_state_pol_flow_match(struct xfrm_state *x,
                                   struct xfrm_policy *xp, struct flowi *fl)
   {
           return 1;
   }
   
   static int dummy_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
   {
           return 0;
   }
   
   #endif /* CONFIG_SECURITY_NETWORK_XFRM */
   static int dummy_register_security (const char *name, struct security_operations *ops)
   {
           return -EINVAL;
   }
   
   static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
   {
           return;
   }
   
   static int dummy_getprocattr(struct task_struct *p, char *name, char **value)
   {
           return -EINVAL;
   }
   
   static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
   {
           return -EINVAL;
   }
   
   static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
   {
           return -EOPNOTSUPP;
   }
   
   static int dummy_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
   {
           return -EOPNOTSUPP;
   }
   
   static void dummy_release_secctx(char *secdata, u32 seclen)
   {
  }
  
  #ifdef CONFIG_KEYS
  static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
                                    unsigned long flags)
  {
          return 0;
  }
  
  static inline void dummy_key_free(struct key *key)
  {
  }
  
  static inline int dummy_key_permission(key_ref_t key_ref,
                                         struct task_struct *context,
                                         key_perm_t perm)
  {
          return 0;
  }
  
  static int dummy_key_getsecurity(struct key *key, char **_buffer)
  {
          *_buffer = NULL;
          return 0;
  }
  
  #endif /* CONFIG_KEYS */
  
  #ifdef CONFIG_AUDIT
  static inline int dummy_audit_rule_init(u32 field, u32 op, char *rulestr,
                                          void **lsmrule)
  {
          return 0;
  }
  
  static inline int dummy_audit_rule_known(struct audit_krule *krule)
  {
          return 0;
  }
  
  static inline int dummy_audit_rule_match(u32 secid, u32 field, u32 op,
                                           void *lsmrule,
                                           struct audit_context *actx)
  {
          return 0;
  }
  
  static inline void dummy_audit_rule_free(void *lsmrule)
  { }
  
  #endif /* CONFIG_AUDIT */
  
  struct security_operations dummy_security_ops = {
          .name = "dummy",
  };
  
  #define set_to_dummy_if_null(ops, function)                             \
          do {                                                            \
                  if (!ops->function) {                                   \
                          ops->function = dummy_##function;               \
                          pr_debug("Had to override the " #function       \
                                   " security operation with the dummy one.\n");\
                          }                                               \
          } while (0)
  
  void security_fixup_ops (struct security_operations *ops)
  {
          set_to_dummy_if_null(ops, ptrace);
          set_to_dummy_if_null(ops, capget);
          set_to_dummy_if_null(ops, capset_check);
          set_to_dummy_if_null(ops, capset_set);
          set_to_dummy_if_null(ops, acct);
          set_to_dummy_if_null(ops, capable);
          set_to_dummy_if_null(ops, quotactl);
          set_to_dummy_if_null(ops, quota_on);
          set_to_dummy_if_null(ops, sysctl);
          set_to_dummy_if_null(ops, syslog);
          set_to_dummy_if_null(ops, settime);
          set_to_dummy_if_null(ops, vm_enough_memory);
          set_to_dummy_if_null(ops, bprm_alloc_security);
          set_to_dummy_if_null(ops, bprm_free_security);
          set_to_dummy_if_null(ops, bprm_apply_creds);
          set_to_dummy_if_null(ops, bprm_post_apply_creds);
          set_to_dummy_if_null(ops, bprm_set_security);
          set_to_dummy_if_null(ops, bprm_check_security);
          set_to_dummy_if_null(ops, bprm_secureexec);
          set_to_dummy_if_null(ops, sb_alloc_security);
          set_to_dummy_if_null(ops, sb_free_security);
          set_to_dummy_if_null(ops, sb_copy_data);
          set_to_dummy_if_null(ops, sb_kern_mount);
          set_to_dummy_if_null(ops, sb_statfs);
          set_to_dummy_if_null(ops, sb_mount);
          set_to_dummy_if_null(ops, sb_check_sb);
          set_to_dummy_if_null(ops, sb_umount);
          set_to_dummy_if_null(ops, sb_umount_close);
          set_to_dummy_if_null(ops, sb_umount_busy);
          set_to_dummy_if_null(ops, sb_post_remount);
          set_to_dummy_if_null(ops, sb_post_addmount);
          set_to_dummy_if_null(ops, sb_pivotroot);
          set_to_dummy_if_null(ops, sb_post_pivotroot);
          set_to_dummy_if_null(ops, sb_get_mnt_opts);
          set_to_dummy_if_null(ops, sb_set_mnt_opts);
          set_to_dummy_if_null(ops, sb_clone_mnt_opts);
          set_to_dummy_if_null(ops, sb_parse_opts_str);
          set_to_dummy_if_null(ops, inode_alloc_security);
          set_to_dummy_if_null(ops, inode_free_security);
          set_to_dummy_if_null(ops, inode_init_security);
          set_to_dummy_if_null(ops, inode_create);
          set_to_dummy_if_null(ops, inode_link);
          set_to_dummy_if_null(ops, inode_unlink);
          set_to_dummy_if_null(ops, inode_symlink);
          set_to_dummy_if_null(ops, inode_mkdir);
          set_to_dummy_if_null(ops, inode_rmdir);
          set_to_dummy_if_null(ops, inode_mknod);
          set_to_dummy_if_null(ops, inode_rename);
          set_to_dummy_if_null(ops, inode_readlink);
          set_to_dummy_if_null(ops, inode_follow_link);
          set_to_dummy_if_null(ops, inode_permission);
          set_to_dummy_if_null(ops, inode_setattr);
          set_to_dummy_if_null(ops, inode_getattr);
          set_to_dummy_if_null(ops, inode_delete);
          set_to_dummy_if_null(ops, inode_setxattr);
          set_to_dummy_if_null(ops, inode_post_setxattr);
          set_to_dummy_if_null(ops, inode_getxattr);
          set_to_dummy_if_null(ops, inode_listxattr);
          set_to_dummy_if_null(ops, inode_removexattr);
          set_to_dummy_if_null(ops, inode_need_killpriv);
          set_to_dummy_if_null(ops, inode_killpriv);
          set_to_dummy_if_null(ops, inode_getsecurity);
          set_to_dummy_if_null(ops, inode_setsecurity);
          set_to_dummy_if_null(ops, inode_listsecurity);
          set_to_dummy_if_null(ops, inode_getsecid);
          set_to_dummy_if_null(ops, file_permission);
          set_to_dummy_if_null(ops, file_alloc_security);
          set_to_dummy_if_null(ops, file_free_security);
          set_to_dummy_if_null(ops, file_ioctl);
          set_to_dummy_if_null(ops, file_mmap);
          set_to_dummy_if_null(ops, file_mprotect);
          set_to_dummy_if_null(ops, file_lock);
          set_to_dummy_if_null(ops, file_fcntl);
          set_to_dummy_if_null(ops, file_set_fowner);
          set_to_dummy_if_null(ops, file_send_sigiotask);
          set_to_dummy_if_null(ops, file_receive);
          set_to_dummy_if_null(ops, dentry_open);
          set_to_dummy_if_null(ops, task_create);
          set_to_dummy_if_null(ops, task_alloc_security);
          set_to_dummy_if_null(ops, task_free_security);
          set_to_dummy_if_null(ops, task_setuid);
          set_to_dummy_if_null(ops, task_post_setuid);
          set_to_dummy_if_null(ops, task_setgid);
          set_to_dummy_if_null(ops, task_setpgid);
          set_to_dummy_if_null(ops, task_getpgid);
          set_to_dummy_if_null(ops, task_getsid);
          set_to_dummy_if_null(ops, task_getsecid);
          set_to_dummy_if_null(ops, task_setgroups);
          set_to_dummy_if_null(ops, task_setnice);
          set_to_dummy_if_null(ops, task_setioprio);
          set_to_dummy_if_null(ops, task_getioprio);
          set_to_dummy_if_null(ops, task_setrlimit);
          set_to_dummy_if_null(ops, task_setscheduler);
          set_to_dummy_if_null(ops, task_getscheduler);
          set_to_dummy_if_null(ops, task_movememory);
          set_to_dummy_if_null(ops, task_wait);
          set_to_dummy_if_null(ops, task_kill);
          set_to_dummy_if_null(ops, task_prctl);
          set_to_dummy_if_null(ops, task_reparent_to_init);
          set_to_dummy_if_null(ops, task_to_inode);
          set_to_dummy_if_null(ops, ipc_permission);
          set_to_dummy_if_null(ops, ipc_getsecid);
          set_to_dummy_if_null(ops, msg_msg_alloc_security);
          set_to_dummy_if_null(ops, msg_msg_free_security);
          set_to_dummy_if_null(ops, msg_queue_alloc_security);
          set_to_dummy_if_null(ops, msg_queue_free_security);
          set_to_dummy_if_null(ops, msg_queue_associate);
          set_to_dummy_if_null(ops, msg_queue_msgctl);
          set_to_dummy_if_null(ops, msg_queue_msgsnd);
          set_to_dummy_if_null(ops, msg_queue_msgrcv);
          set_to_dummy_if_null(ops, shm_alloc_security);
          set_to_dummy_if_null(ops, shm_free_security);
          set_to_dummy_if_null(ops, shm_associate);
          set_to_dummy_if_null(ops, shm_shmctl);
          set_to_dummy_if_null(ops, shm_shmat);
          set_to_dummy_if_null(ops, sem_alloc_security);
          set_to_dummy_if_null(ops, sem_free_security);
          set_to_dummy_if_null(ops, sem_associate);
          set_to_dummy_if_null(ops, sem_semctl);
          set_to_dummy_if_null(ops, sem_semop);
          set_to_dummy_if_null(ops, netlink_send);
          set_to_dummy_if_null(ops, netlink_recv);
          set_to_dummy_if_null(ops, register_security);
          set_to_dummy_if_null(ops, d_instantiate);
          set_to_dummy_if_null(ops, getprocattr);
          set_to_dummy_if_null(ops, setprocattr);
          set_to_dummy_if_null(ops, secid_to_secctx);
          set_to_dummy_if_null(ops, secctx_to_secid);
          set_to_dummy_if_null(ops, release_secctx);
  #ifdef CONFIG_SECURITY_NETWORK
          set_to_dummy_if_null(ops, unix_stream_connect);
          set_to_dummy_if_null(ops, unix_may_send);
          set_to_dummy_if_null(ops, socket_create);
          set_to_dummy_if_null(ops, socket_post_create);
          set_to_dummy_if_null(ops, socket_bind);
          set_to_dummy_if_null(ops, socket_connect);
          set_to_dummy_if_null(ops, socket_listen);
          set_to_dummy_if_null(ops, socket_accept);
          set_to_dummy_if_null(ops, socket_post_accept);
          set_to_dummy_if_null(ops, socket_sendmsg);
          set_to_dummy_if_null(ops, socket_recvmsg);
          set_to_dummy_if_null(ops, socket_getsockname);
          set_to_dummy_if_null(ops, socket_getpeername);
          set_to_dummy_if_null(ops, socket_setsockopt);
          set_to_dummy_if_null(ops, socket_getsockopt);
          set_to_dummy_if_null(ops, socket_shutdown);
          set_to_dummy_if_null(ops, socket_sock_rcv_skb);
          set_to_dummy_if_null(ops, socket_getpeersec_stream);
          set_to_dummy_if_null(ops, socket_getpeersec_dgram);
          set_to_dummy_if_null(ops, sk_alloc_security);
          set_to_dummy_if_null(ops, sk_free_security);
          set_to_dummy_if_null(ops, sk_clone_security);
          set_to_dummy_if_null(ops, sk_getsecid);
          set_to_dummy_if_null(ops, sock_graft);
          set_to_dummy_if_null(ops, inet_conn_request);
          set_to_dummy_if_null(ops, inet_csk_clone);
          set_to_dummy_if_null(ops, inet_conn_established);
          set_to_dummy_if_null(ops, req_classify_flow);
   #endif /* CONFIG_SECURITY_NETWORK */
  #ifdef  CONFIG_SECURITY_NETWORK_XFRM
          set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
          set_to_dummy_if_null(ops, xfrm_policy_clone_security);
          set_to_dummy_if_null(ops, xfrm_policy_free_security);
          set_to_dummy_if_null(ops, xfrm_policy_delete_security);
          set_to_dummy_if_null(ops, xfrm_state_alloc_security);
          set_to_dummy_if_null(ops, xfrm_state_free_security);
          set_to_dummy_if_null(ops, xfrm_state_delete_security);
          set_to_dummy_if_null(ops, xfrm_policy_lookup);
          set_to_dummy_if_null(ops, xfrm_state_pol_flow_match);
          set_to_dummy_if_null(ops, xfrm_decode_session);
  #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
  #ifdef CONFIG_KEYS
          set_to_dummy_if_null(ops, key_alloc);
          set_to_dummy_if_null(ops, key_free);
          set_to_dummy_if_null(ops, key_permission);
          set_to_dummy_if_null(ops, key_getsecurity);
  #endif  /* CONFIG_KEYS */
  #ifdef CONFIG_AUDIT
          set_to_dummy_if_null(ops, audit_rule_init);
          set_to_dummy_if_null(ops, audit_rule_known);
          set_to_dummy_if_null(ops, audit_rule_match);
          set_to_dummy_if_null(ops, audit_rule_free);
  #endif
  }
  

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