2 * Capabilities Linux Security Module
4 * This is the default security module in case no other module is loaded.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
13 #include <linux/security.h>
15 static int cap_acct(struct file *file)
20 static int cap_sysctl(ctl_table *table, int op)
25 static int cap_quotactl(int cmds, int type, int id, struct super_block *sb)
30 static int cap_quota_on(struct dentry *dentry)
35 static int cap_bprm_alloc_security(struct linux_binprm *bprm)
40 static void cap_bprm_free_security(struct linux_binprm *bprm)
44 static void cap_bprm_post_apply_creds(struct linux_binprm *bprm)
48 static int cap_bprm_check_security(struct linux_binprm *bprm)
53 static int cap_sb_alloc_security(struct super_block *sb)
58 static void cap_sb_free_security(struct super_block *sb)
62 static int cap_sb_copy_data(char *orig, char *copy)
67 static int cap_sb_kern_mount(struct super_block *sb, void *data)
72 static int cap_sb_show_options(struct seq_file *m, struct super_block *sb)
77 static int cap_sb_statfs(struct dentry *dentry)
82 static int cap_sb_mount(char *dev_name, struct path *path, char *type,
83 unsigned long flags, void *data)
88 static int cap_sb_check_sb(struct vfsmount *mnt, struct path *path)
93 static int cap_sb_umount(struct vfsmount *mnt, int flags)
98 static void cap_sb_umount_close(struct vfsmount *mnt)
102 static void cap_sb_umount_busy(struct vfsmount *mnt)
106 static void cap_sb_post_remount(struct vfsmount *mnt, unsigned long flags,
111 static void cap_sb_post_addmount(struct vfsmount *mnt, struct path *path)
115 static int cap_sb_pivotroot(struct path *old_path, struct path *new_path)
120 static void cap_sb_post_pivotroot(struct path *old_path, struct path *new_path)
124 static int cap_sb_set_mnt_opts(struct super_block *sb,
125 struct security_mnt_opts *opts)
127 if (unlikely(opts->num_mnt_opts))
132 static void cap_sb_clone_mnt_opts(const struct super_block *oldsb,
133 struct super_block *newsb)
137 static int cap_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
142 static int cap_inode_alloc_security(struct inode *inode)
147 static void cap_inode_free_security(struct inode *inode)
151 static int cap_inode_init_security(struct inode *inode, struct inode *dir,
152 char **name, void **value, size_t *len)
157 static int cap_inode_create(struct inode *inode, struct dentry *dentry,
163 static int cap_inode_link(struct dentry *old_dentry, struct inode *inode,
164 struct dentry *new_dentry)
169 static int cap_inode_unlink(struct inode *inode, struct dentry *dentry)
174 static int cap_inode_symlink(struct inode *inode, struct dentry *dentry,
180 static int cap_inode_mkdir(struct inode *inode, struct dentry *dentry,
186 static int cap_inode_rmdir(struct inode *inode, struct dentry *dentry)
191 static int cap_inode_mknod(struct inode *inode, struct dentry *dentry,
197 static int cap_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
198 struct inode *new_inode, struct dentry *new_dentry)
203 static int cap_inode_readlink(struct dentry *dentry)
208 static int cap_inode_follow_link(struct dentry *dentry,
209 struct nameidata *nameidata)
214 static int cap_inode_permission(struct inode *inode, int mask,
215 struct nameidata *nd)
220 static int cap_inode_setattr(struct dentry *dentry, struct iattr *iattr)
225 static int cap_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
230 static void cap_inode_delete(struct inode *ino)
234 static void cap_inode_post_setxattr(struct dentry *dentry, const char *name,
235 const void *value, size_t size, int flags)
239 static int cap_inode_getxattr(struct dentry *dentry, const char *name)
244 static int cap_inode_listxattr(struct dentry *dentry)
249 static int cap_inode_getsecurity(const struct inode *inode, const char *name,
250 void **buffer, bool alloc)
255 static int cap_inode_setsecurity(struct inode *inode, const char *name,
256 const void *value, size_t size, int flags)
261 static int cap_inode_listsecurity(struct inode *inode, char *buffer,
267 static void cap_inode_getsecid(const struct inode *inode, u32 *secid)
272 static int cap_file_permission(struct file *file, int mask)
277 static int cap_file_alloc_security(struct file *file)
282 static void cap_file_free_security(struct file *file)
286 static int cap_file_ioctl(struct file *file, unsigned int command,
292 static int cap_file_mmap(struct file *file, unsigned long reqprot,
293 unsigned long prot, unsigned long flags,
294 unsigned long addr, unsigned long addr_only)
296 if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
301 static int cap_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
307 static int cap_file_lock(struct file *file, unsigned int cmd)
312 static int cap_file_fcntl(struct file *file, unsigned int cmd,
318 static int cap_file_set_fowner(struct file *file)
323 static int cap_file_send_sigiotask(struct task_struct *tsk,
324 struct fown_struct *fown, int sig)
329 static int cap_file_receive(struct file *file)
334 static int cap_dentry_open(struct file *file)
339 static int cap_task_create(unsigned long clone_flags)
344 static int cap_task_alloc_security(struct task_struct *p)
349 static void cap_task_free_security(struct task_struct *p)
353 static int cap_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
358 static int cap_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
363 static int cap_task_setpgid(struct task_struct *p, pid_t pgid)
368 static int cap_task_getpgid(struct task_struct *p)
373 static int cap_task_getsid(struct task_struct *p)
378 static void cap_task_getsecid(struct task_struct *p, u32 *secid)
383 static int cap_task_setgroups(struct group_info *group_info)
388 static int cap_task_getioprio(struct task_struct *p)
393 static int cap_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
398 static int cap_task_getscheduler(struct task_struct *p)
403 static int cap_task_movememory(struct task_struct *p)
408 static int cap_task_wait(struct task_struct *p)
413 static int cap_task_kill(struct task_struct *p, struct siginfo *info,
419 static void cap_task_to_inode(struct task_struct *p, struct inode *inode)
423 static int cap_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
428 static void cap_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
433 static int cap_msg_msg_alloc_security(struct msg_msg *msg)
438 static void cap_msg_msg_free_security(struct msg_msg *msg)
442 static int cap_msg_queue_alloc_security(struct msg_queue *msq)
447 static void cap_msg_queue_free_security(struct msg_queue *msq)
451 static int cap_msg_queue_associate(struct msg_queue *msq, int msqflg)
456 static int cap_msg_queue_msgctl(struct msg_queue *msq, int cmd)
461 static int cap_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
467 static int cap_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
468 struct task_struct *target, long type, int mode)
473 static int cap_shm_alloc_security(struct shmid_kernel *shp)
478 static void cap_shm_free_security(struct shmid_kernel *shp)
482 static int cap_shm_associate(struct shmid_kernel *shp, int shmflg)
487 static int cap_shm_shmctl(struct shmid_kernel *shp, int cmd)
492 static int cap_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
498 static int cap_sem_alloc_security(struct sem_array *sma)
503 static void cap_sem_free_security(struct sem_array *sma)
507 static int cap_sem_associate(struct sem_array *sma, int semflg)
512 static int cap_sem_semctl(struct sem_array *sma, int cmd)
517 static int cap_sem_semop(struct sem_array *sma, struct sembuf *sops,
518 unsigned nsops, int alter)
523 #ifdef CONFIG_SECURITY_NETWORK
524 static int cap_unix_stream_connect(struct socket *sock, struct socket *other,
530 static int cap_unix_may_send(struct socket *sock, struct socket *other)
535 static int cap_socket_create(int family, int type, int protocol, int kern)
540 static int cap_socket_post_create(struct socket *sock, int family, int type,
541 int protocol, int kern)
546 static int cap_socket_bind(struct socket *sock, struct sockaddr *address,
552 static int cap_socket_connect(struct socket *sock, struct sockaddr *address,
558 static int cap_socket_listen(struct socket *sock, int backlog)
563 static int cap_socket_accept(struct socket *sock, struct socket *newsock)
568 static void cap_socket_post_accept(struct socket *sock, struct socket *newsock)
572 static int cap_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
577 static int cap_socket_recvmsg(struct socket *sock, struct msghdr *msg,
583 static int cap_socket_getsockname(struct socket *sock)
588 static int cap_socket_getpeername(struct socket *sock)
593 static int cap_socket_setsockopt(struct socket *sock, int level, int optname)
598 static int cap_socket_getsockopt(struct socket *sock, int level, int optname)
603 static int cap_socket_shutdown(struct socket *sock, int how)
608 static int cap_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
613 static int cap_socket_getpeersec_stream(struct socket *sock,
615 int __user *optlen, unsigned len)
620 static int cap_socket_getpeersec_dgram(struct socket *sock,
621 struct sk_buff *skb, u32 *secid)
626 static int cap_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
631 static void cap_sk_free_security(struct sock *sk)
635 static void cap_sk_clone_security(const struct sock *sk, struct sock *newsk)
639 static void cap_sk_getsecid(struct sock *sk, u32 *secid)
643 static void cap_sock_graft(struct sock *sk, struct socket *parent)
647 static int cap_inet_conn_request(struct sock *sk, struct sk_buff *skb,
648 struct request_sock *req)
653 static void cap_inet_csk_clone(struct sock *newsk,
654 const struct request_sock *req)
658 static void cap_inet_conn_established(struct sock *sk, struct sk_buff *skb)
662 static void cap_req_classify_flow(const struct request_sock *req,
666 #endif /* CONFIG_SECURITY_NETWORK */
668 #ifdef CONFIG_SECURITY_NETWORK_XFRM
669 static int cap_xfrm_policy_alloc_security(struct xfrm_sec_ctx **ctxp,
670 struct xfrm_user_sec_ctx *sec_ctx)
675 static int cap_xfrm_policy_clone_security(struct xfrm_sec_ctx *old_ctx,
676 struct xfrm_sec_ctx **new_ctxp)
681 static void cap_xfrm_policy_free_security(struct xfrm_sec_ctx *ctx)
685 static int cap_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx)
690 static int cap_xfrm_state_alloc_security(struct xfrm_state *x,
691 struct xfrm_user_sec_ctx *sec_ctx,
697 static void cap_xfrm_state_free_security(struct xfrm_state *x)
701 static int cap_xfrm_state_delete_security(struct xfrm_state *x)
706 static int cap_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 sk_sid, u8 dir)
711 static int cap_xfrm_state_pol_flow_match(struct xfrm_state *x,
712 struct xfrm_policy *xp,
718 static int cap_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
723 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
724 static void cap_d_instantiate(struct dentry *dentry, struct inode *inode)
728 static int cap_getprocattr(struct task_struct *p, char *name, char **value)
733 static int cap_setprocattr(struct task_struct *p, char *name, void *value,
739 static int cap_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
744 static int cap_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
749 static void cap_release_secctx(char *secdata, u32 seclen)
754 static int cap_key_alloc(struct key *key, struct task_struct *ctx,
760 static void cap_key_free(struct key *key)
764 static int cap_key_permission(key_ref_t key_ref, struct task_struct *context,
770 static int cap_key_getsecurity(struct key *key, char **_buffer)
776 #endif /* CONFIG_KEYS */
779 static int cap_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
784 static int cap_audit_rule_known(struct audit_krule *krule)
789 static int cap_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
790 struct audit_context *actx)
795 static void cap_audit_rule_free(void *lsmrule)
798 #endif /* CONFIG_AUDIT */
800 struct security_operations default_security_ops = {
804 #define set_to_cap_if_null(ops, function) \
806 if (!ops->function) { \
807 ops->function = cap_##function; \
808 pr_debug("Had to override the " #function \
809 " security operation with the default.\n");\
813 void security_fixup_ops(struct security_operations *ops)
815 set_to_cap_if_null(ops, ptrace);
816 set_to_cap_if_null(ops, capget);
817 set_to_cap_if_null(ops, capset_check);
818 set_to_cap_if_null(ops, capset_set);
819 set_to_cap_if_null(ops, acct);
820 set_to_cap_if_null(ops, capable);
821 set_to_cap_if_null(ops, quotactl);
822 set_to_cap_if_null(ops, quota_on);
823 set_to_cap_if_null(ops, sysctl);
824 set_to_cap_if_null(ops, syslog);
825 set_to_cap_if_null(ops, settime);
826 set_to_cap_if_null(ops, vm_enough_memory);
827 set_to_cap_if_null(ops, bprm_alloc_security);
828 set_to_cap_if_null(ops, bprm_free_security);
829 set_to_cap_if_null(ops, bprm_apply_creds);
830 set_to_cap_if_null(ops, bprm_post_apply_creds);
831 set_to_cap_if_null(ops, bprm_set_security);
832 set_to_cap_if_null(ops, bprm_check_security);
833 set_to_cap_if_null(ops, bprm_secureexec);
834 set_to_cap_if_null(ops, sb_alloc_security);
835 set_to_cap_if_null(ops, sb_free_security);
836 set_to_cap_if_null(ops, sb_copy_data);
837 set_to_cap_if_null(ops, sb_kern_mount);
838 set_to_cap_if_null(ops, sb_show_options);
839 set_to_cap_if_null(ops, sb_statfs);
840 set_to_cap_if_null(ops, sb_mount);
841 set_to_cap_if_null(ops, sb_check_sb);
842 set_to_cap_if_null(ops, sb_umount);
843 set_to_cap_if_null(ops, sb_umount_close);
844 set_to_cap_if_null(ops, sb_umount_busy);
845 set_to_cap_if_null(ops, sb_post_remount);
846 set_to_cap_if_null(ops, sb_post_addmount);
847 set_to_cap_if_null(ops, sb_pivotroot);
848 set_to_cap_if_null(ops, sb_post_pivotroot);
849 set_to_cap_if_null(ops, sb_set_mnt_opts);
850 set_to_cap_if_null(ops, sb_clone_mnt_opts);
851 set_to_cap_if_null(ops, sb_parse_opts_str);
852 set_to_cap_if_null(ops, inode_alloc_security);
853 set_to_cap_if_null(ops, inode_free_security);
854 set_to_cap_if_null(ops, inode_init_security);
855 set_to_cap_if_null(ops, inode_create);
856 set_to_cap_if_null(ops, inode_link);
857 set_to_cap_if_null(ops, inode_unlink);
858 set_to_cap_if_null(ops, inode_symlink);
859 set_to_cap_if_null(ops, inode_mkdir);
860 set_to_cap_if_null(ops, inode_rmdir);
861 set_to_cap_if_null(ops, inode_mknod);
862 set_to_cap_if_null(ops, inode_rename);
863 set_to_cap_if_null(ops, inode_readlink);
864 set_to_cap_if_null(ops, inode_follow_link);
865 set_to_cap_if_null(ops, inode_permission);
866 set_to_cap_if_null(ops, inode_setattr);
867 set_to_cap_if_null(ops, inode_getattr);
868 set_to_cap_if_null(ops, inode_delete);
869 set_to_cap_if_null(ops, inode_setxattr);
870 set_to_cap_if_null(ops, inode_post_setxattr);
871 set_to_cap_if_null(ops, inode_getxattr);
872 set_to_cap_if_null(ops, inode_listxattr);
873 set_to_cap_if_null(ops, inode_removexattr);
874 set_to_cap_if_null(ops, inode_need_killpriv);
875 set_to_cap_if_null(ops, inode_killpriv);
876 set_to_cap_if_null(ops, inode_getsecurity);
877 set_to_cap_if_null(ops, inode_setsecurity);
878 set_to_cap_if_null(ops, inode_listsecurity);
879 set_to_cap_if_null(ops, inode_getsecid);
880 set_to_cap_if_null(ops, file_permission);
881 set_to_cap_if_null(ops, file_alloc_security);
882 set_to_cap_if_null(ops, file_free_security);
883 set_to_cap_if_null(ops, file_ioctl);
884 set_to_cap_if_null(ops, file_mmap);
885 set_to_cap_if_null(ops, file_mprotect);
886 set_to_cap_if_null(ops, file_lock);
887 set_to_cap_if_null(ops, file_fcntl);
888 set_to_cap_if_null(ops, file_set_fowner);
889 set_to_cap_if_null(ops, file_send_sigiotask);
890 set_to_cap_if_null(ops, file_receive);
891 set_to_cap_if_null(ops, dentry_open);
892 set_to_cap_if_null(ops, task_create);
893 set_to_cap_if_null(ops, task_alloc_security);
894 set_to_cap_if_null(ops, task_free_security);
895 set_to_cap_if_null(ops, task_setuid);
896 set_to_cap_if_null(ops, task_post_setuid);
897 set_to_cap_if_null(ops, task_setgid);
898 set_to_cap_if_null(ops, task_setpgid);
899 set_to_cap_if_null(ops, task_getpgid);
900 set_to_cap_if_null(ops, task_getsid);
901 set_to_cap_if_null(ops, task_getsecid);
902 set_to_cap_if_null(ops, task_setgroups);
903 set_to_cap_if_null(ops, task_setnice);
904 set_to_cap_if_null(ops, task_setioprio);
905 set_to_cap_if_null(ops, task_getioprio);
906 set_to_cap_if_null(ops, task_setrlimit);
907 set_to_cap_if_null(ops, task_setscheduler);
908 set_to_cap_if_null(ops, task_getscheduler);
909 set_to_cap_if_null(ops, task_movememory);
910 set_to_cap_if_null(ops, task_wait);
911 set_to_cap_if_null(ops, task_kill);
912 set_to_cap_if_null(ops, task_prctl);
913 set_to_cap_if_null(ops, task_reparent_to_init);
914 set_to_cap_if_null(ops, task_to_inode);
915 set_to_cap_if_null(ops, ipc_permission);
916 set_to_cap_if_null(ops, ipc_getsecid);
917 set_to_cap_if_null(ops, msg_msg_alloc_security);
918 set_to_cap_if_null(ops, msg_msg_free_security);
919 set_to_cap_if_null(ops, msg_queue_alloc_security);
920 set_to_cap_if_null(ops, msg_queue_free_security);
921 set_to_cap_if_null(ops, msg_queue_associate);
922 set_to_cap_if_null(ops, msg_queue_msgctl);
923 set_to_cap_if_null(ops, msg_queue_msgsnd);
924 set_to_cap_if_null(ops, msg_queue_msgrcv);
925 set_to_cap_if_null(ops, shm_alloc_security);
926 set_to_cap_if_null(ops, shm_free_security);
927 set_to_cap_if_null(ops, shm_associate);
928 set_to_cap_if_null(ops, shm_shmctl);
929 set_to_cap_if_null(ops, shm_shmat);
930 set_to_cap_if_null(ops, sem_alloc_security);
931 set_to_cap_if_null(ops, sem_free_security);
932 set_to_cap_if_null(ops, sem_associate);
933 set_to_cap_if_null(ops, sem_semctl);
934 set_to_cap_if_null(ops, sem_semop);
935 set_to_cap_if_null(ops, netlink_send);
936 set_to_cap_if_null(ops, netlink_recv);
937 set_to_cap_if_null(ops, d_instantiate);
938 set_to_cap_if_null(ops, getprocattr);
939 set_to_cap_if_null(ops, setprocattr);
940 set_to_cap_if_null(ops, secid_to_secctx);
941 set_to_cap_if_null(ops, secctx_to_secid);
942 set_to_cap_if_null(ops, release_secctx);
943 #ifdef CONFIG_SECURITY_NETWORK
944 set_to_cap_if_null(ops, unix_stream_connect);
945 set_to_cap_if_null(ops, unix_may_send);
946 set_to_cap_if_null(ops, socket_create);
947 set_to_cap_if_null(ops, socket_post_create);
948 set_to_cap_if_null(ops, socket_bind);
949 set_to_cap_if_null(ops, socket_connect);
950 set_to_cap_if_null(ops, socket_listen);
951 set_to_cap_if_null(ops, socket_accept);
952 set_to_cap_if_null(ops, socket_post_accept);
953 set_to_cap_if_null(ops, socket_sendmsg);
954 set_to_cap_if_null(ops, socket_recvmsg);
955 set_to_cap_if_null(ops, socket_getsockname);
956 set_to_cap_if_null(ops, socket_getpeername);
957 set_to_cap_if_null(ops, socket_setsockopt);
958 set_to_cap_if_null(ops, socket_getsockopt);
959 set_to_cap_if_null(ops, socket_shutdown);
960 set_to_cap_if_null(ops, socket_sock_rcv_skb);
961 set_to_cap_if_null(ops, socket_getpeersec_stream);
962 set_to_cap_if_null(ops, socket_getpeersec_dgram);
963 set_to_cap_if_null(ops, sk_alloc_security);
964 set_to_cap_if_null(ops, sk_free_security);
965 set_to_cap_if_null(ops, sk_clone_security);
966 set_to_cap_if_null(ops, sk_getsecid);
967 set_to_cap_if_null(ops, sock_graft);
968 set_to_cap_if_null(ops, inet_conn_request);
969 set_to_cap_if_null(ops, inet_csk_clone);
970 set_to_cap_if_null(ops, inet_conn_established);
971 set_to_cap_if_null(ops, req_classify_flow);
972 #endif /* CONFIG_SECURITY_NETWORK */
973 #ifdef CONFIG_SECURITY_NETWORK_XFRM
974 set_to_cap_if_null(ops, xfrm_policy_alloc_security);
975 set_to_cap_if_null(ops, xfrm_policy_clone_security);
976 set_to_cap_if_null(ops, xfrm_policy_free_security);
977 set_to_cap_if_null(ops, xfrm_policy_delete_security);
978 set_to_cap_if_null(ops, xfrm_state_alloc_security);
979 set_to_cap_if_null(ops, xfrm_state_free_security);
980 set_to_cap_if_null(ops, xfrm_state_delete_security);
981 set_to_cap_if_null(ops, xfrm_policy_lookup);
982 set_to_cap_if_null(ops, xfrm_state_pol_flow_match);
983 set_to_cap_if_null(ops, xfrm_decode_session);
984 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
986 set_to_cap_if_null(ops, key_alloc);
987 set_to_cap_if_null(ops, key_free);
988 set_to_cap_if_null(ops, key_permission);
989 set_to_cap_if_null(ops, key_getsecurity);
990 #endif /* CONFIG_KEYS */
992 set_to_cap_if_null(ops, audit_rule_init);
993 set_to_cap_if_null(ops, audit_rule_known);
994 set_to_cap_if_null(ops, audit_rule_match);
995 set_to_cap_if_null(ops, audit_rule_free);