static inline u32 file_mask_to_av(int mode, int mask)
{
	u32 av = 0;

	if (!S_ISDIR(mode)) {
		if (mask & MAY_EXEC)
			av |= FILE__EXECUTE;
		if (mask & MAY_READ)
			av |= FILE__READ;

		if (mask & MAY_APPEND)
			av |= FILE__APPEND;
		else if (mask & MAY_WRITE)
			av |= FILE__WRITE;

	} else {
		if (mask & MAY_EXEC)
			av |= DIR__SEARCH;
		if (mask & MAY_WRITE)
			av |= DIR__WRITE;
		if (mask & MAY_READ)
			av |= DIR__READ;
	}

	return av;
}


selinux,smack: fix subjective/objective credential use mixups

Jann Horn reported a problem with commit eb1231f73c4d ("selinux:
clarify task subjective and objective credentials") where some LSM
hooks were attempting to access the subjective credentials of a task
other than the current task.  Generally speaking, it is not safe to
access another task's subjective credentials and doing so can cause
a number of problems.

Further, while looking into the problem, I realized that Smack was
suffering from a similar problem brought about by a similar commit
1fb057dcde11 ("smack: differentiate between subjective and objective
task credentials").

This patch addresses this problem by restoring the use of the task's
objective credentials in those cases where the task is other than the
current executing task.  Not only does this resolve the problem
reported by Jann, it is arguably the correct thing to do in these
cases.

Cc: stable@vger.kernel.org
Fixes: eb1231f73c4d ("selinux: clarify task subjective and objective credentials")
Fixes: 1fb057dcde11 ("smack: differentiate between subjective and objective task credentials")
Reported-by: Jann Horn <jannh@google.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

static int smack_file_fcntl(struct file *file, unsigned int cmd,
			    unsigned long arg)
{
	struct smk_audit_info ad;
	int rc = 0;
	struct inode *inode = file_inode(file);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	switch (cmd) {
	case F_GETLK:
		break;
	case F_SETLK:
	case F_SETLKW:
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
		smk_ad_setfield_u_fs_path(&ad, file->f_path);
		rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
		rc = smk_bu_file(file, MAY_LOCK, rc);
		break;
	case F_SETOWN:
	case F_SETSIG:
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
		smk_ad_setfield_u_fs_path(&ad, file->f_path);
		rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
		rc = smk_bu_file(file, MAY_WRITE, rc);
		break;
	default:
		break;
	}

	return rc;
}

An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.


static int smack_socket_socketpair(struct socket *socka,
		                   struct socket *sockb)
{
	struct socket_smack *asp = socka->sk->sk_security;
	struct socket_smack *bsp = sockb->sk->sk_security;

	asp->smk_packet = bsp->smk_out;
	bsp->smk_packet = asp->smk_out;

	return 0;
}


static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__SETPGID, NULL);
}


static unsigned int selinux_ip_postroute(struct sk_buff *skb,
					 const struct net_device *outdev,
					 u16 family)
{
	u32 secmark_perm;
	u32 peer_sid;
	int ifindex = outdev->ifindex;
	struct sock *sk;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	char *addrp;
	u8 secmark_active;
	u8 peerlbl_active;

	/* If any sort of compatibility mode is enabled then handoff processing
	 * to the selinux_ip_postroute_compat() function to deal with the
	 * special handling.  We do this in an attempt to keep this function
	 * as fast and as clean as possible. */
	if (!selinux_policycap_netpeer())
		return selinux_ip_postroute_compat(skb, ifindex, family);

	secmark_active = selinux_secmark_enabled();
	peerlbl_active = selinux_peerlbl_enabled();
	if (!secmark_active && !peerlbl_active)
		return NF_ACCEPT;

	sk = skb_to_full_sk(skb);

#ifdef CONFIG_XFRM
	/* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
	 * packet transformation so allow the packet to pass without any checks
	 * since we'll have another chance to perform access control checks
	 * when the packet is on it's final way out.
	 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
	 *       is NULL, in this case go ahead and apply access control.
	 * NOTE: if this is a local socket (skb->sk != NULL) that is in the
	 *       TCP listening state we cannot wait until the XFRM processing
	 *       is done as we will miss out on the SA label if we do;
	 *       unfortunately, this means more work, but it is only once per
	 *       connection. */
	if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL &&
	    !(sk && sk_listener(sk)))
		return NF_ACCEPT;
#endif

	if (sk == NULL) {
		/* Without an associated socket the packet is either coming
		 * from the kernel or it is being forwarded; check the packet
		 * to determine which and if the packet is being forwarded
		 * query the packet directly to determine the security label. */
		if (skb->skb_iif) {
			secmark_perm = PACKET__FORWARD_OUT;
			if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
				return NF_DROP;
		} else {
			secmark_perm = PACKET__SEND;
			peer_sid = SECINITSID_KERNEL;
		}
	} else if (sk_listener(sk)) {
		/* Locally generated packet but the associated socket is in the
		 * listening state which means this is a SYN-ACK packet.  In
		 * this particular case the correct security label is assigned
		 * to the connection/request_sock but unfortunately we can't
		 * query the request_sock as it isn't queued on the parent
		 * socket until after the SYN-ACK packet is sent; the only
		 * viable choice is to regenerate the label like we do in
		 * selinux_inet_conn_request().  See also selinux_ip_output()
		 * for similar problems. */
		u32 skb_sid;
		struct sk_security_struct *sksec;

		sksec = sk->sk_security;
		if (selinux_skb_peerlbl_sid(skb, family, &skb_sid))
			return NF_DROP;
		/* At this point, if the returned skb peerlbl is SECSID_NULL
		 * and the packet has been through at least one XFRM
		 * transformation then we must be dealing with the "final"
		 * form of labeled IPsec packet; since we've already applied
		 * all of our access controls on this packet we can safely
		 * pass the packet. */
		if (skb_sid == SECSID_NULL) {
			switch (family) {
			case PF_INET:
				if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
					return NF_ACCEPT;
				break;
			case PF_INET6:
				if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
					return NF_ACCEPT;
				break;
			default:
				return NF_DROP_ERR(-ECONNREFUSED);
			}
		}
		if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid))
			return NF_DROP;
		secmark_perm = PACKET__SEND;
	} else {
		/* Locally generated packet, fetch the security label from the
		 * associated socket. */
		struct sk_security_struct *sksec = sk->sk_security;
		peer_sid = sksec->sid;
		secmark_perm = PACKET__SEND;
	}

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->netif = ifindex;
	ad.u.net->family = family;
	if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
		return NF_DROP;

	if (secmark_active)
		if (avc_has_perm(&selinux_state,
				 peer_sid, skb->secmark,
				 SECCLASS_PACKET, secmark_perm, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);

	if (peerlbl_active) {
		u32 if_sid;
		u32 node_sid;

		if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid))
			return NF_DROP;
		if (avc_has_perm(&selinux_state,
				 peer_sid, if_sid,
				 SECCLASS_NETIF, NETIF__EGRESS, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);

		if (sel_netnode_sid(addrp, family, &node_sid))
			return NF_DROP;
		if (avc_has_perm(&selinux_state,
				 peer_sid, node_sid,
				 SECCLASS_NODE, NODE__SENDTO, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);
	}

	return NF_ACCEPT;
}


static u32 bpf_map_fmode_to_av(fmode_t fmode)
{
	u32 av = 0;

	if (fmode & FMODE_READ)
		av |= BPF__MAP_READ;
	if (fmode & FMODE_WRITE)
		av |= BPF__MAP_WRITE;
	return av;
}


static int smk_bu_note(char *note, struct smack_known *sskp,
		       struct smack_known *oskp, int mode, int rc)
{
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
		sskp->smk_known, oskp->smk_known, acc, note);
	return 0;
}


static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
{
	struct smack_known **blob = smack_ipc(isp);

	*blob = smk_of_current();
	return 0;
}


static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask)
{
	return may_create(dir, dentry, SECCLASS_DIR);
}


static int selinux_perf_event_alloc(struct perf_event *event)
{
	struct perf_event_security_struct *perfsec;

	perfsec = kzalloc(sizeof(*perfsec), GFP_KERNEL);
	if (!perfsec)
		return -ENOMEM;

	perfsec->sid = current_sid();
	event->security = perfsec;

	return 0;
}


static int bad_option(struct superblock_security_struct *sbsec, char flag,
		      u32 old_sid, u32 new_sid)
{
	char mnt_flags = sbsec->flags & SE_MNTMASK;

	/* check if the old mount command had the same options */
	if (sbsec->flags & SE_SBINITIALIZED)
		if (!(sbsec->flags & flag) ||
		    (old_sid != new_sid))
			return 1;

	/* check if we were passed the same options twice,
	 * aka someone passed context=a,context=b
	 */
	if (!(sbsec->flags & SE_SBINITIALIZED))
		if (mnt_flags & flag)
			return 1;
	return 0;
}


static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
				       const struct qstr *qstr,
				       const char **name,
				       void **value, size_t *len)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct superblock_security_struct *sbsec;
	u32 newsid, clen;
	int rc;
	char *context;

	sbsec = selinux_superblock(dir->i_sb);

	newsid = tsec->create_sid;

	rc = selinux_determine_inode_label(tsec, dir, qstr,
		inode_mode_to_security_class(inode->i_mode),
		&newsid);
	if (rc)
		return rc;

	/* Possibly defer initialization to selinux_complete_init. */
	if (sbsec->flags & SE_SBINITIALIZED) {
		struct inode_security_struct *isec = selinux_inode(inode);
		isec->sclass = inode_mode_to_security_class(inode->i_mode);
		isec->sid = newsid;
		isec->initialized = LABEL_INITIALIZED;
	}

	if (!selinux_initialized(&selinux_state) ||
	    !(sbsec->flags & SBLABEL_MNT))
		return -EOPNOTSUPP;

	if (name)
		*name = XATTR_SELINUX_SUFFIX;

	if (value && len) {
		rc = security_sid_to_context_force(&selinux_state, newsid,
						   &context, &clen);
		if (rc)
			return rc;
		*value = context;
		*len = clen;
	}

	return 0;
}


static inline int default_protocol_stream(int protocol)
{
	return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP ||
		protocol == IPPROTO_MPTCP);
}


static void selinux_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
				  struct sock *newsk)
{
	struct sk_security_struct *sksec = sk->sk_security;
	struct sk_security_struct *newsksec = newsk->sk_security;

	/* If policy does not support SECCLASS_SCTP_SOCKET then call
	 * the non-sctp clone version.
	 */
	if (!selinux_policycap_extsockclass())
		return selinux_sk_clone_security(sk, newsk);

	newsksec->sid = ep->secid;
	newsksec->peer_sid = ep->peer_secid;
	newsksec->sclass = sksec->sclass;
	selinux_netlbl_sctp_sk_clone(sk, newsk);
}


static void smack_inode_getsecid(struct inode *inode, u32 *secid)
{
	struct smack_known *skp = smk_of_inode(inode);

	*secid = skp->smk_secid;
}


static int __init checkreqprot_setup(char *str)
{
	unsigned long checkreqprot;

	if (!kstrtoul(str, 0, &checkreqprot)) {
		selinux_checkreqprot_boot = checkreqprot ? 1 : 0;
		if (checkreqprot)
			pr_warn("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");
	}
	return 1;
}


static int smack_inode_rename(struct inode *old_inode,
			      struct dentry *old_dentry,
			      struct inode *new_inode,
			      struct dentry *new_dentry)
{
	int rc;
	struct smack_known *isp;
	struct smk_audit_info ad;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);

	isp = smk_of_inode(d_backing_inode(old_dentry));
	rc = smk_curacc(isp, MAY_READWRITE, &ad);
	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);

	if (rc == 0 && d_is_positive(new_dentry)) {
		isp = smk_of_inode(d_backing_inode(new_dentry));
		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
		rc = smk_curacc(isp, MAY_READWRITE, &ad);
		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
	}
	return rc;
}


static int selinux_binder_transfer_file(struct task_struct *from,
					struct task_struct *to,
					struct file *file)
{
	u32 sid = task_sid_binder(to);
	struct file_security_struct *fsec = selinux_file(file);
	struct dentry *dentry = file->f_path.dentry;
	struct inode_security_struct *isec;
	struct common_audit_data ad;
	int rc;

	ad.type = LSM_AUDIT_DATA_PATH;
	ad.u.path = file->f_path;

	if (sid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  sid, fsec->sid,
				  SECCLASS_FD,
				  FD__USE,
				  &ad);
		if (rc)
			return rc;
	}

#ifdef CONFIG_BPF_SYSCALL
	rc = bpf_fd_pass(file, sid);
	if (rc)
		return rc;
#endif

	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;

	isec = backing_inode_security(dentry);
	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, file_to_av(file),
			    &ad);
}


static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
	u32 peer_secid = SECSID_NULL;
	u16 family;
	struct inode_security_struct *isec;

	if (skb && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;
	else if (skb && skb->protocol == htons(ETH_P_IPV6))
		family = PF_INET6;
	else if (sock)
		family = sock->sk->sk_family;
	else
		goto out;

	if (sock && family == PF_UNIX) {
		isec = inode_security_novalidate(SOCK_INODE(sock));
		peer_secid = isec->sid;
	} else if (skb)
		selinux_skb_peerlbl_sid(skb, family, &peer_secid);

out:
	*secid = peer_secid;
	if (peer_secid == SECSID_NULL)
		return -EINVAL;
	return 0;
}


static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
			  kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(target), SECCLASS_PROCESS,
			    PROCESS__GETCAP, NULL);
}


static void selinux_release_secctx(char *secdata, u32 seclen)
{
	kfree(secdata);
}


static int superblock_has_perm(const struct cred *cred,
			       struct super_block *sb,
			       u32 perms,
			       struct common_audit_data *ad)
{
	struct superblock_security_struct *sbsec;
	u32 sid = cred_sid(cred);

	sbsec = selinux_superblock(sb);
	return avc_has_perm(&selinux_state,
			    sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
}


static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
{
	int err;

	err = sock_has_perm(sock->sk, SOCKET__SETOPT);
	if (err)
		return err;

	return selinux_netlbl_socket_setsockopt(sock, level, optname);
}


static void smack_inet_csk_clone(struct sock *sk,
				 const struct request_sock *req)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp;

	if (req->peer_secid != 0) {
		skp = smack_from_secid(req->peer_secid);
		ssp->smk_packet = skp;
	} else
		ssp->smk_packet = NULL;
}


static int selinux_set_mnt_opts(struct super_block *sb,
				void *mnt_opts,
				unsigned long kern_flags,
				unsigned long *set_kern_flags)
{
	const struct cred *cred = current_cred();
	struct superblock_security_struct *sbsec = selinux_superblock(sb);
	struct dentry *root = sb->s_root;
	struct selinux_mnt_opts *opts = mnt_opts;
	struct inode_security_struct *root_isec;
	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
	u32 defcontext_sid = 0;
	int rc = 0;

	mutex_lock(&sbsec->lock);

	if (!selinux_initialized(&selinux_state)) {
		if (!opts) {
			/* Defer initialization until selinux_complete_init,
			   after the initial policy is loaded and the security
			   server is ready to handle calls. */
			goto out;
		}
		rc = -EINVAL;
		pr_warn("SELinux: Unable to set superblock options "
			"before the security server is initialized\n");
		goto out;
	}
	if (kern_flags && !set_kern_flags) {
		/* Specifying internal flags without providing a place to
		 * place the results is not allowed */
		rc = -EINVAL;
		goto out;
	}

	/*
	 * Binary mount data FS will come through this function twice.  Once
	 * from an explicit call and once from the generic calls from the vfs.
	 * Since the generic VFS calls will not contain any security mount data
	 * we need to skip the double mount verification.
	 *
	 * This does open a hole in which we will not notice if the first
	 * mount using this sb set explict options and a second mount using
	 * this sb does not set any security options.  (The first options
	 * will be used for both mounts)
	 */
	if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
	    && !opts)
		goto out;

	root_isec = backing_inode_security_novalidate(root);

	/*
	 * parse the mount options, check if they are valid sids.
	 * also check if someone is trying to mount the same sb more
	 * than once with different security options.
	 */
	if (opts) {
		if (opts->fscontext) {
			rc = parse_sid(sb, opts->fscontext, &fscontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
					fscontext_sid))
				goto out_double_mount;
			sbsec->flags |= FSCONTEXT_MNT;
		}
		if (opts->context) {
			rc = parse_sid(sb, opts->context, &context_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
					context_sid))
				goto out_double_mount;
			sbsec->flags |= CONTEXT_MNT;
		}
		if (opts->rootcontext) {
			rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
					rootcontext_sid))
				goto out_double_mount;
			sbsec->flags |= ROOTCONTEXT_MNT;
		}
		if (opts->defcontext) {
			rc = parse_sid(sb, opts->defcontext, &defcontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
					defcontext_sid))
				goto out_double_mount;
			sbsec->flags |= DEFCONTEXT_MNT;
		}
	}

	if (sbsec->flags & SE_SBINITIALIZED) {
		/* previously mounted with options, but not on this attempt? */
		if ((sbsec->flags & SE_MNTMASK) && !opts)
			goto out_double_mount;
		rc = 0;
		goto out;
	}

	if (strcmp(sb->s_type->name, "proc") == 0)
		sbsec->flags |= SE_SBPROC | SE_SBGENFS;

	if (!strcmp(sb->s_type->name, "debugfs") ||
	    !strcmp(sb->s_type->name, "tracefs") ||
	    !strcmp(sb->s_type->name, "binder") ||
	    !strcmp(sb->s_type->name, "bpf") ||
	    !strcmp(sb->s_type->name, "pstore"))
		sbsec->flags |= SE_SBGENFS;

	if (!strcmp(sb->s_type->name, "sysfs") ||
	    !strcmp(sb->s_type->name, "cgroup") ||
	    !strcmp(sb->s_type->name, "cgroup2"))
		sbsec->flags |= SE_SBGENFS | SE_SBGENFS_XATTR;

	if (!sbsec->behavior) {
		/*
		 * Determine the labeling behavior to use for this
		 * filesystem type.
		 */
		rc = security_fs_use(&selinux_state, sb);
		if (rc) {
			pr_warn("%s: security_fs_use(%s) returned %d\n",
					__func__, sb->s_type->name, rc);
			goto out;
		}
	}

	/*
	 * If this is a user namespace mount and the filesystem type is not
	 * explicitly whitelisted, then no contexts are allowed on the command
	 * line and security labels must be ignored.
	 */
	if (sb->s_user_ns != &init_user_ns &&
	    strcmp(sb->s_type->name, "tmpfs") &&
	    strcmp(sb->s_type->name, "ramfs") &&
	    strcmp(sb->s_type->name, "devpts") &&
	    strcmp(sb->s_type->name, "overlay")) {
		if (context_sid || fscontext_sid || rootcontext_sid ||
		    defcontext_sid) {
			rc = -EACCES;
			goto out;
		}
		if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
			sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
			rc = security_transition_sid(&selinux_state,
						     current_sid(),
						     current_sid(),
						     SECCLASS_FILE, NULL,
						     &sbsec->mntpoint_sid);
			if (rc)
				goto out;
		}
		goto out_set_opts;
	}

	/* sets the context of the superblock for the fs being mounted. */
	if (fscontext_sid) {
		rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
		if (rc)
			goto out;

		sbsec->sid = fscontext_sid;
	}

	/*
	 * Switch to using mount point labeling behavior.
	 * sets the label used on all file below the mountpoint, and will set
	 * the superblock context if not already set.
	 */
	if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) {
		sbsec->behavior = SECURITY_FS_USE_NATIVE;
		*set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
	}

	if (context_sid) {
		if (!fscontext_sid) {
			rc = may_context_mount_sb_relabel(context_sid, sbsec,
							  cred);
			if (rc)
				goto out;
			sbsec->sid = context_sid;
		} else {
			rc = may_context_mount_inode_relabel(context_sid, sbsec,
							     cred);
			if (rc)
				goto out;
		}
		if (!rootcontext_sid)
			rootcontext_sid = context_sid;

		sbsec->mntpoint_sid = context_sid;
		sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
	}

	if (rootcontext_sid) {
		rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
						     cred);
		if (rc)
			goto out;

		root_isec->sid = rootcontext_sid;
		root_isec->initialized = LABEL_INITIALIZED;
	}

	if (defcontext_sid) {
		if (sbsec->behavior != SECURITY_FS_USE_XATTR &&
			sbsec->behavior != SECURITY_FS_USE_NATIVE) {
			rc = -EINVAL;
			pr_warn("SELinux: defcontext option is "
			       "invalid for this filesystem type\n");
			goto out;
		}

		if (defcontext_sid != sbsec->def_sid) {
			rc = may_context_mount_inode_relabel(defcontext_sid,
							     sbsec, cred);
			if (rc)
				goto out;
		}

		sbsec->def_sid = defcontext_sid;
	}

out_set_opts:
	rc = sb_finish_set_opts(sb);
out:
	mutex_unlock(&sbsec->lock);
	return rc;
out_double_mount:
	rc = -EINVAL;
	pr_warn("SELinux: mount invalid.  Same superblock, different "
	       "security settings for (dev %s, type %s)\n", sb->s_id,
	       sb->s_type->name);
	goto out;
}


static int selinux_kernel_read_file(struct file *file,
				    enum kernel_read_file_id id,
				    bool contents)
{
	int rc = 0;

	switch (id) {
	case READING_MODULE:
		rc = selinux_kernel_module_from_file(contents ? file : NULL);
		break;
	default:
		break;
	}

	return rc;
}


static int selinux_inode_alloc_security(struct inode *inode)
{
	struct inode_security_struct *isec = selinux_inode(inode);
	u32 sid = current_sid();

	spin_lock_init(&isec->lock);
	INIT_LIST_HEAD(&isec->list);
	isec->inode = inode;
	isec->sid = SECINITSID_UNLABELED;
	isec->sclass = SECCLASS_FILE;
	isec->task_sid = sid;
	isec->initialized = LABEL_INVALID;

	return 0;
}


static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(msq);
	ipc_init_security(isec, SECCLASS_MSGQ);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__CREATE, &ad);
	return rc;
}


static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
{
	struct inode *inode = d_backing_inode(dentry);

	return selinux_inode(inode);
}


static int selinux_shm_shmat(struct kern_ipc_perm *shp,
			     char __user *shmaddr, int shmflg)
{
	u32 perms;

	if (shmflg & SHM_RDONLY)
		perms = SHM__READ;
	else
		perms = SHM__READ | SHM__WRITE;

	return ipc_has_perm(shp, perms);
}


static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
{
	int rc, cap_sys_admin = 0;

	rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
				 CAP_OPT_NOAUDIT, true);
	if (rc == 0)
		cap_sys_admin = 1;

	return cap_sys_admin;
}


static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
{
	int err;
	u32 xfrm_sid;
	u32 nlbl_sid;
	u32 nlbl_type;

	err = selinux_xfrm_skb_sid(skb, &xfrm_sid);
	if (unlikely(err))
		return -EACCES;
	err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
	if (unlikely(err))
		return -EACCES;

	err = security_net_peersid_resolve(&selinux_state, nlbl_sid,
					   nlbl_type, xfrm_sid, sid);
	if (unlikely(err)) {
		pr_warn(
		       "SELinux: failure in selinux_skb_peerlbl_sid(),"
		       " unable to determine packet's peer label\n");
		return -EACCES;
	}

	return 0;
}


static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
{
	return selinux_inode(inode);
}


static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
{
	struct selinux_mnt_opts *opts = mnt_opts;
	struct superblock_security_struct *sbsec = selinux_superblock(sb);
	u32 sid;
	int rc;

	if (!(sbsec->flags & SE_SBINITIALIZED))
		return 0;

	if (!opts)
		return 0;

	if (opts->fscontext) {
		rc = parse_sid(sb, opts->fscontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
			goto out_bad_option;
	}
	if (opts->context) {
		rc = parse_sid(sb, opts->context, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
			goto out_bad_option;
	}
	if (opts->rootcontext) {
		struct inode_security_struct *root_isec;
		root_isec = backing_inode_security(sb->s_root);
		rc = parse_sid(sb, opts->rootcontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
			goto out_bad_option;
	}
	if (opts->defcontext) {
		rc = parse_sid(sb, opts->defcontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
			goto out_bad_option;
	}
	return 0;

out_bad_option:
	pr_warn("SELinux: unable to change security options "
	       "during remount (dev %s, type=%s)\n", sb->s_id,
	       sb->s_type->name);
	return -EINVAL;
}


static void smack_sk_free_security(struct sock *sk)
{
#ifdef SMACK_IPV6_PORT_LABELING
	struct smk_port_label *spp;

	if (sk->sk_family == PF_INET6) {
		rcu_read_lock();
		list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
			if (spp->smk_sock != sk)
				continue;
			spp->smk_can_reuse = 1;
			break;
		}
		rcu_read_unlock();
	}
#endif
	kfree(sk->sk_security);
}


static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
				gfp_t gfp)
{
	struct smack_known_list_elem *nklep;
	struct smack_known_list_elem *oklep;

	list_for_each_entry(oklep, ohead, list) {
		nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
		if (nklep == NULL) {
			smk_destroy_label_list(nhead);
			return -ENOMEM;
		}
		nklep->smk_label = oklep->smk_label;
		list_add(&nklep->list, nhead);
	}

	return 0;
}


static int selinux_capset(struct cred *new, const struct cred *old,
			  const kernel_cap_t *effective,
			  const kernel_cap_t *inheritable,
			  const kernel_cap_t *permitted)
{
	return avc_has_perm(&selinux_state,
			    cred_sid(old), cred_sid(new), SECCLASS_PROCESS,
			    PROCESS__SETCAP, NULL);
}


static int smack_getprocattr(struct task_struct *p, char *name, char **value)
{
	struct smack_known *skp = smk_of_task_struct_obj(p);
	char *cp;
	int slen;

	if (strcmp(name, "current") != 0)
		return -EINVAL;

	cp = kstrdup(skp->smk_known, GFP_KERNEL);
	if (cp == NULL)
		return -ENOMEM;

	slen = strlen(cp);
	*value = cp;
	return slen;
}


static int match_opt_prefix(char *s, int l, char **arg)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(tokens); i++) {
		size_t len = tokens[i].len;
		if (len > l || memcmp(s, tokens[i].name, len))
			continue;
		if (tokens[i].has_arg) {
			if (len == l || s[len] != '=')
				continue;
			*arg = s + len + 1;
		} else if (len != l)
			continue;
		return tokens[i].opt;
	}
	return Opt_error;
}


static int smack_cred_prepare(struct cred *new, const struct cred *old,
			      gfp_t gfp)
{
	struct task_smack *old_tsp = smack_cred(old);
	struct task_smack *new_tsp = smack_cred(new);
	int rc;

	init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task);

	rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
	if (rc != 0)
		return rc;

	rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
				gfp);
	return rc;
}


static void smack_cred_transfer(struct cred *new, const struct cred *old)
{
	struct task_smack *old_tsp = smack_cred(old);
	struct task_smack *new_tsp = smack_cred(new);

	new_tsp->smk_task = old_tsp->smk_task;
	new_tsp->smk_forked = old_tsp->smk_task;
	mutex_init(&new_tsp->smk_rules_lock);
	INIT_LIST_HEAD(&new_tsp->smk_rules);

	/* cbs copy rule list */
}


static int selinux_file_permission(struct file *file, int mask)
{
	struct inode *inode = file_inode(file);
	struct file_security_struct *fsec = selinux_file(file);
	struct inode_security_struct *isec;
	u32 sid = current_sid();

	if (!mask)
		/* No permission to check.  Existence test. */
		return 0;

	isec = inode_security(inode);
	if (sid == fsec->sid && fsec->isid == isec->sid &&
	    fsec->pseqno == avc_policy_seqno(&selinux_state))
		/* No change since file_open check. */
		return 0;

	return selinux_revalidate_file_permission(file, mask);
}


static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
{
	struct sock *sk = sock->sk;
	struct sockaddr_in6 *addr6;
	struct socket_smack *ssp = sock->sk->sk_security;
	struct smk_port_label *spp;
	unsigned short port = 0;

	if (address == NULL) {
		/*
		 * This operation is changing the Smack information
		 * on the bound socket. Take the changes to the port
		 * as well.
		 */
		rcu_read_lock();
		list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
			if (sk != spp->smk_sock)
				continue;
			spp->smk_in = ssp->smk_in;
			spp->smk_out = ssp->smk_out;
			rcu_read_unlock();
			return;
		}
		/*
		 * A NULL address is only used for updating existing
		 * bound entries. If there isn't one, it's OK.
		 */
		rcu_read_unlock();
		return;
	}

	addr6 = (struct sockaddr_in6 *)address;
	port = ntohs(addr6->sin6_port);
	/*
	 * This is a special case that is safely ignored.
	 */
	if (port == 0)
		return;

	/*
	 * Look for an existing port list entry.
	 * This is an indication that a port is getting reused.
	 */
	rcu_read_lock();
	list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
		if (spp->smk_port != port || spp->smk_sock_type != sock->type)
			continue;
		if (spp->smk_can_reuse != 1) {
			rcu_read_unlock();
			return;
		}
		spp->smk_port = port;
		spp->smk_sock = sk;
		spp->smk_in = ssp->smk_in;
		spp->smk_out = ssp->smk_out;
		spp->smk_can_reuse = 0;
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();
	/*
	 * A new port entry is required.
	 */
	spp = kzalloc(sizeof(*spp), GFP_KERNEL);
	if (spp == NULL)
		return;

	spp->smk_port = port;
	spp->smk_sock = sk;
	spp->smk_in = ssp->smk_in;
	spp->smk_out = ssp->smk_out;
	spp->smk_sock_type = sock->type;
	spp->smk_can_reuse = 0;

	mutex_lock(&smack_ipv6_lock);
	list_add_rcu(&spp->list, &smk_ipv6_port_list);
	mutex_unlock(&smack_ipv6_lock);
	return;
}


static int smack_post_notification(const struct cred *w_cred,
				   const struct cred *cred,
				   struct watch_notification *n)
{
	struct smk_audit_info ad;
	struct smack_known *subj, *obj;
	int rc;

	/* Always let maintenance notifications through. */
	if (n->type == WATCH_TYPE_META)
		return 0;

	if (!cred)
		return 0;
	subj = smk_of_task(smack_cred(cred));
	obj = smk_of_task(smack_cred(w_cred));

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION);
	rc = smk_access(subj, obj, MAY_WRITE, &ad);
	rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc);
	return rc;
}


static int smk_bu_current(char *note, struct smack_known *oskp,
			  int mode, int rc)
{
	struct task_smack *tsp = smack_cred(current_cred());
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
		tsp->smk_task->smk_known, oskp->smk_known,
		acc, current->comm, note);
	return 0;
}


static int smack_file_send_sigiotask(struct task_struct *tsk,
				     struct fown_struct *fown, int signum)
{
	struct smack_known **blob;
	struct smack_known *skp;
	struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
	const struct cred *tcred;
	struct file *file;
	int rc;
	struct smk_audit_info ad;

	/*
	 * struct fown_struct is never outside the context of a struct file
	 */
	file = container_of(fown, struct file, f_owner);

	/* we don't log here as rc can be overriden */
	blob = smack_file(file);
	skp = *blob;
	rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
	rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);

	rcu_read_lock();
	tcred = __task_cred(tsk);
	if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred))
		rc = 0;
	rcu_read_unlock();

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
	smk_ad_setfield_u_tsk(&ad, tsk);
	smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
	return rc;
}


static int cred_has_capability(const struct cred *cred,
			       int cap, unsigned int opts, bool initns)
{
	struct common_audit_data ad;
	struct av_decision avd;
	u16 sclass;
	u32 sid = cred_sid(cred);
	u32 av = CAP_TO_MASK(cap);
	int rc;

	ad.type = LSM_AUDIT_DATA_CAP;
	ad.u.cap = cap;

	switch (CAP_TO_INDEX(cap)) {
	case 0:
		sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
		break;
	case 1:
		sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
		break;
	default:
		pr_err("SELinux:  out of range capability %d\n", cap);
		BUG();
		return -EINVAL;
	}

	rc = avc_has_perm_noaudit(&selinux_state,
				  sid, sid, sclass, av, 0, &avd);
	if (!(opts & CAP_OPT_NOAUDIT)) {
		int rc2 = avc_audit(&selinux_state,
				    sid, sid, sclass, av, &avd, rc, &ad);
		if (rc2)
			return rc2;
	}
	return rc;
}


static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
{
	*secid = cred_sid(c);
}


static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp = NULL;
	int rc = 0;
	struct smk_audit_info ad;
	u16 family = sk->sk_family;
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 sadd;
	int proto;

	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;
#endif /* CONFIG_IPV6 */

	switch (family) {
	case PF_INET:
		/*
		 * If there is a secmark use it rather than the CIPSO label.
		 * If there is no secmark fall back to CIPSO.
		 * The secmark is assumed to reflect policy better.
		 */
		skp = smack_from_skb(skb);
		if (skp == NULL) {
			skp = smack_from_netlbl(sk, family, skb);
			if (skp == NULL)
				skp = smack_net_ambient;
		}

#ifdef CONFIG_AUDIT
		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
		ad.a.u.net->family = family;
		ad.a.u.net->netif = skb->skb_iif;
		ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
		/*
		 * Receiving a packet requires that the other end
		 * be able to write here. Read access is not required.
		 * This is the simplist possible security model
		 * for networking.
		 */
		rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
		rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
					MAY_WRITE, rc);
		if (rc != 0)
			netlbl_skbuff_err(skb, family, rc, 0);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case PF_INET6:
		proto = smk_skb_to_addr_ipv6(skb, &sadd);
		if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE &&
		    proto != IPPROTO_TCP && proto != IPPROTO_DCCP)
			break;
#ifdef SMACK_IPV6_SECMARK_LABELING
		skp = smack_from_skb(skb);
		if (skp == NULL) {
			if (smk_ipv6_localhost(&sadd))
				break;
			skp = smack_ipv6host_label(&sadd);
			if (skp == NULL)
				skp = smack_net_ambient;
		}
#ifdef CONFIG_AUDIT
		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
		ad.a.u.net->family = family;
		ad.a.u.net->netif = skb->skb_iif;
		ipv6_skb_to_auditdata(skb, &ad.a, NULL);
#endif /* CONFIG_AUDIT */
		rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
		rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
					MAY_WRITE, rc);
#endif /* SMACK_IPV6_SECMARK_LABELING */
#ifdef SMACK_IPV6_PORT_LABELING
		rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
#endif /* SMACK_IPV6_PORT_LABELING */
		if (rc != 0)
			icmpv6_send(skb, ICMPV6_DEST_UNREACH,
					ICMPV6_ADM_PROHIBITED, 0);
		break;
#endif /* CONFIG_IPV6 */
	}

	return rc;
}


static void smack_task_getsecid_subj(struct task_struct *p, u32 *secid)
{
	struct smack_known *skp = smk_of_task_struct_subj(p);

	*secid = skp->smk_secid;
}


static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
			     char **_addrp, int src, u8 *proto)
{
	char *addrp;
	int ret;

	switch (ad->u.net->family) {
	case PF_INET:
		ret = selinux_parse_skb_ipv4(skb, ad, proto);
		if (ret)
			goto parse_error;
		addrp = (char *)(src ? &ad->u.net->v4info.saddr :
				       &ad->u.net->v4info.daddr);
		goto okay;

#if IS_ENABLED(CONFIG_IPV6)
	case PF_INET6:
		ret = selinux_parse_skb_ipv6(skb, ad, proto);
		if (ret)
			goto parse_error;
		addrp = (char *)(src ? &ad->u.net->v6info.saddr :
				       &ad->u.net->v6info.daddr);
		goto okay;
#endif	/* IPV6 */
	default:
		addrp = NULL;
		goto okay;
	}

parse_error:
	pr_warn(
	       "SELinux: failure in selinux_parse_skb(),"
	       " unable to parse packet\n");
	return ret;

okay:
	if (_addrp)
		*_addrp = addrp;
	return 0;
}


static int show_sid(struct seq_file *m, u32 sid)
{
	char *context = NULL;
	u32 len;
	int rc;

	rc = security_sid_to_context(&selinux_state, sid,
					     &context, &len);
	if (!rc) {
		bool has_comma = context && strchr(context, ',');

		seq_putc(m, '=');
		if (has_comma)
			seq_putc(m, '\"');
		seq_escape(m, context, "\"\n\\");
		if (has_comma)
			seq_putc(m, '\"');
	}
	kfree(context);
	return rc;
}


static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *ip = d_backing_inode(dentry);
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);

	/*
	 * You need write access to the thing you're unlinking
	 */
	rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
	rc = smk_bu_inode(ip, MAY_WRITE, rc);
	if (rc == 0) {
		/*
		 * You also need write access to the containing directory
		 */
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
		smk_ad_setfield_u_fs_inode(&ad, dir);
		rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
		rc = smk_bu_inode(dir, MAY_WRITE, rc);
	}
	return rc;
}


static int sb_check_xattr_support(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = sb->s_security;
	struct dentry *root = sb->s_root;
	struct inode *root_inode = d_backing_inode(root);
	u32 sid;
	int rc;

	/*
	 * Make sure that the xattr handler exists and that no
	 * error other than -ENODATA is returned by getxattr on
	 * the root directory.  -ENODATA is ok, as this may be
	 * the first boot of the SELinux kernel before we have
	 * assigned xattr values to the filesystem.
	 */
	if (!(root_inode->i_opflags & IOP_XATTR)) {
		pr_warn("SELinux: (dev %s, type %s) has no xattr support\n",
			sb->s_id, sb->s_type->name);
		goto fallback;
	}

	rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
	if (rc < 0 && rc != -ENODATA) {
		if (rc == -EOPNOTSUPP) {
			pr_warn("SELinux: (dev %s, type %s) has no security xattr handler\n",
				sb->s_id, sb->s_type->name);
			goto fallback;
		} else {
			pr_warn("SELinux: (dev %s, type %s) getxattr errno %d\n",
				sb->s_id, sb->s_type->name, -rc);
			return rc;
		}
	}
	return 0;

fallback:
	/* No xattr support - try to fallback to genfs if possible. */
	rc = security_genfs_sid(&selinux_state, sb->s_type->name, "/",
				SECCLASS_DIR, &sid);
	if (rc)
		return -EOPNOTSUPP;

	pr_warn("SELinux: (dev %s, type %s) falling back to genfs\n",
		sb->s_id, sb->s_type->name);
	sbsec->behavior = SECURITY_FS_USE_GENFS;
	sbsec->sid = sid;
	return 0;
}


static int smack_kernel_create_files_as(struct cred *new,
					struct inode *inode)
{
	struct inode_smack *isp = smack_inode(inode);
	struct task_smack *tsp = smack_cred(new);

	tsp->smk_forked = isp->smk_inode;
	tsp->smk_task = tsp->smk_forked;
	return 0;
}


static int smack_key_permission(key_ref_t key_ref,
				const struct cred *cred,
				enum key_need_perm need_perm)
{
	struct key *keyp;
	struct smk_audit_info ad;
	struct smack_known *tkp = smk_of_task(smack_cred(cred));
	int request = 0;
	int rc;

	/*
	 * Validate requested permissions
	 */
	switch (need_perm) {
	case KEY_NEED_READ:
	case KEY_NEED_SEARCH:
	case KEY_NEED_VIEW:
		request |= MAY_READ;
		break;
	case KEY_NEED_WRITE:
	case KEY_NEED_LINK:
	case KEY_NEED_SETATTR:
		request |= MAY_WRITE;
		break;
	case KEY_NEED_UNSPECIFIED:
	case KEY_NEED_UNLINK:
	case KEY_SYSADMIN_OVERRIDE:
	case KEY_AUTHTOKEN_OVERRIDE:
	case KEY_DEFER_PERM_CHECK:
		return 0;
	default:
		return -EINVAL;
	}

	keyp = key_ref_to_ptr(key_ref);
	if (keyp == NULL)
		return -EINVAL;
	/*
	 * If the key hasn't been initialized give it access so that
	 * it may do so.
	 */
	if (keyp->security == NULL)
		return 0;
	/*
	 * This should not occur
	 */
	if (tkp == NULL)
		return -EACCES;

	if (smack_privileged(CAP_MAC_OVERRIDE))
		return 0;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
	ad.a.u.key_struct.key = keyp->serial;
	ad.a.u.key_struct.key_desc = keyp->description;
#endif
	rc = smk_access(tkp, keyp->security, request, &ad);
	rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
	return rc;
}


static int selinux_path_notify(const struct path *path, u64 mask,
						unsigned int obj_type)
{
	int ret;
	u32 perm;

	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_PATH;
	ad.u.path = *path;

	/*
	 * Set permission needed based on the type of mark being set.
	 * Performs an additional check for sb watches.
	 */
	switch (obj_type) {
	case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
		perm = FILE__WATCH_MOUNT;
		break;
	case FSNOTIFY_OBJ_TYPE_SB:
		perm = FILE__WATCH_SB;
		ret = superblock_has_perm(current_cred(), path->dentry->d_sb,
						FILESYSTEM__WATCH, &ad);
		if (ret)
			return ret;
		break;
	case FSNOTIFY_OBJ_TYPE_INODE:
		perm = FILE__WATCH;
		break;
	default:
		return -EINVAL;
	}

	/* blocking watches require the file:watch_with_perm permission */
	if (mask & (ALL_FSNOTIFY_PERM_EVENTS))
		perm |= FILE__WATCH_WITH_PERM;

	/* watches on read-like events need the file:watch_reads permission */
	if (mask & (FS_ACCESS | FS_ACCESS_PERM | FS_CLOSE_NOWRITE))
		perm |= FILE__WATCH_READS;

	return path_has_perm(current_cred(), path, perm);
}


static int smack_mmap_file(struct file *file,
			   unsigned long reqprot, unsigned long prot,
			   unsigned long flags)
{
	struct smack_known *skp;
	struct smack_known *mkp;
	struct smack_rule *srp;
	struct task_smack *tsp;
	struct smack_known *okp;
	struct inode_smack *isp;
	struct superblock_smack *sbsp;
	int may;
	int mmay;
	int tmay;
	int rc;

	if (file == NULL)
		return 0;

	if (unlikely(IS_PRIVATE(file_inode(file))))
		return 0;

	isp = smack_inode(file_inode(file));
	if (isp->smk_mmap == NULL)
		return 0;
	sbsp = smack_superblock(file_inode(file)->i_sb);
	if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
	    isp->smk_mmap != sbsp->smk_root)
		return -EACCES;
	mkp = isp->smk_mmap;

	tsp = smack_cred(current_cred());
	skp = smk_of_current();
	rc = 0;

	rcu_read_lock();
	/*
	 * For each Smack rule associated with the subject
	 * label verify that the SMACK64MMAP also has access
	 * to that rule's object label.
	 */
	list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
		okp = srp->smk_object;
		/*
		 * Matching labels always allows access.
		 */
		if (mkp->smk_known == okp->smk_known)
			continue;
		/*
		 * If there is a matching local rule take
		 * that into account as well.
		 */
		may = smk_access_entry(srp->smk_subject->smk_known,
				       okp->smk_known,
				       &tsp->smk_rules);
		if (may == -ENOENT)
			may = srp->smk_access;
		else
			may &= srp->smk_access;
		/*
		 * If may is zero the SMACK64MMAP subject can't
		 * possibly have less access.
		 */
		if (may == 0)
			continue;

		/*
		 * Fetch the global list entry.
		 * If there isn't one a SMACK64MMAP subject
		 * can't have as much access as current.
		 */
		mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
					&mkp->smk_rules);
		if (mmay == -ENOENT) {
			rc = -EACCES;
			break;
		}
		/*
		 * If there is a local entry it modifies the
		 * potential access, too.
		 */
		tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
					&tsp->smk_rules);
		if (tmay != -ENOENT)
			mmay &= tmay;

		/*
		 * If there is any access available to current that is
		 * not available to a SMACK64MMAP subject
		 * deny access.
		 */
		if ((may | mmay) != mmay) {
			rc = -EACCES;
			break;
		}
	}

	rcu_read_unlock();

	return rc;
}


static int smack_key_alloc(struct key *key, const struct cred *cred,
			   unsigned long flags)
{
	struct smack_known *skp = smk_of_task(smack_cred(cred));

	key->security = skp;
	return 0;
}


static int selinux_sb_alloc_security(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = selinux_superblock(sb);

	mutex_init(&sbsec->lock);
	INIT_LIST_HEAD(&sbsec->isec_head);
	spin_lock_init(&sbsec->isec_lock);
	sbsec->sid = SECINITSID_UNLABELED;
	sbsec->def_sid = SECINITSID_FILE;
	sbsec->mntpoint_sid = SECINITSID_UNLABELED;

	return 0;
}


static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
		struct rlimit *new_rlim)
{
	struct rlimit *old_rlim = p->signal->rlim + resource;

	/* Control the ability to change the hard limit (whether
	   lowering or raising it), so that the hard limit can
	   later be used as a safe reset point for the soft limit
	   upon context transitions.  See selinux_bprm_committing_creds. */
	if (old_rlim->rlim_max != new_rlim->rlim_max)
		return avc_has_perm(&selinux_state,
				    current_sid(), task_sid_obj(p),
				    SECCLASS_PROCESS, PROCESS__SETRLIMIT, NULL);

	return 0;
}


static int inode_has_perm(const struct cred *cred,
			  struct inode *inode,
			  u32 perms,
			  struct common_audit_data *adp)
{
	struct inode_security_struct *isec;
	u32 sid;

	validate_creds(cred);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	sid = cred_sid(cred);
	isec = selinux_inode(inode);

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, perms, adp);
}


static int smack_file_open(struct file *file)
{
	struct task_smack *tsp = smack_cred(file->f_cred);
	struct inode *inode = file_inode(file);
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);
	rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
	rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc);

	return rc;
}


static int selinux_task_getscheduler(struct task_struct *p)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__GETSCHED, NULL);
}


static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg)
{
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(msq);
	msec = selinux_msg_msg(msg);

	/*
	 * First time through, need to assign label to the message
	 */
	if (msec->sid == SECINITSID_UNLABELED) {
		/*
		 * Compute new sid based on current process and
		 * message queue this message will be stored in
		 */
		rc = security_transition_sid(&selinux_state, sid, isec->sid,
					     SECCLASS_MSG, NULL, &msec->sid);
		if (rc)
			return rc;
	}

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	/* Can this process write to the queue? */
	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__WRITE, &ad);
	if (!rc)
		/* Can this process send the message */
		rc = avc_has_perm(&selinux_state,
				  sid, msec->sid, SECCLASS_MSG,
				  MSG__SEND, &ad);
	if (!rc)
		/* Can the message be put in the queue? */
		rc = avc_has_perm(&selinux_state,
				  msec->sid, isec->sid, SECCLASS_MSGQ,
				  MSGQ__ENQUEUE, &ad);

	return rc;
}


static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
				   struct request_sock *req)
{
	u16 family = sk->sk_family;
	struct smack_known *skp;
	struct socket_smack *ssp = sk->sk_security;
	struct sockaddr_in addr;
	struct iphdr *hdr;
	struct smack_known *hskp;
	int rc;
	struct smk_audit_info ad;
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif

#if IS_ENABLED(CONFIG_IPV6)
	if (family == PF_INET6) {
		/*
		 * Handle mapped IPv4 packets arriving
		 * via IPv6 sockets. Don't set up netlabel
		 * processing on IPv6.
		 */
		if (skb->protocol == htons(ETH_P_IP))
			family = PF_INET;
		else
			return 0;
	}
#endif /* CONFIG_IPV6 */

	/*
	 * If there is a secmark use it rather than the CIPSO label.
	 * If there is no secmark fall back to CIPSO.
	 * The secmark is assumed to reflect policy better.
	 */
	skp = smack_from_skb(skb);
	if (skp == NULL) {
		skp = smack_from_netlbl(sk, family, skb);
		if (skp == NULL)
			skp = &smack_known_huh;
	}

#ifdef CONFIG_AUDIT
	smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
	ad.a.u.net->family = family;
	ad.a.u.net->netif = skb->skb_iif;
	ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
	/*
	 * Receiving a packet requires that the other end be able to write
	 * here. Read access is not required.
	 */
	rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
	rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
	if (rc != 0)
		return rc;

	/*
	 * Save the peer's label in the request_sock so we can later setup
	 * smk_packet in the child socket so that SO_PEERCRED can report it.
	 */
	req->peer_secid = skp->smk_secid;

	/*
	 * We need to decide if we want to label the incoming connection here
	 * if we do we only need to label the request_sock and the stack will
	 * propagate the wire-label to the sock when it is created.
	 */
	hdr = ip_hdr(skb);
	addr.sin_addr.s_addr = hdr->saddr;
	rcu_read_lock();
	hskp = smack_ipv4host_label(&addr);
	rcu_read_unlock();

	if (hskp == NULL)
		rc = netlbl_req_setattr(req, &skp->smk_netlabel);
	else
		netlbl_req_delattr(req);

	return rc;
}


static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
			u32 perms)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();

	isec = selinux_ipc(ipc_perms);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = ipc_perms->key;

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, perms, &ad);
}


static int smack_file_lock(struct file *file, unsigned int cmd)
{
	struct smk_audit_info ad;
	int rc;
	struct inode *inode = file_inode(file);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);
	rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
	rc = smk_bu_file(file, MAY_LOCK, rc);
	return rc;
}


static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
	return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx,
				       ctxlen, 0);
}


static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
{
	struct super_block *sbp;
	struct superblock_smack *sbsp;
	struct inode_smack *isp;
	struct smack_known *skp;
	struct smack_known *ckp = smk_of_current();
	struct smack_known *final;
	char trattr[TRANS_TRUE_SIZE];
	int transflag = 0;
	int rc;
	struct dentry *dp;

	if (inode == NULL)
		return;

	isp = smack_inode(inode);

	/*
	 * If the inode is already instantiated
	 * take the quick way out
	 */
	if (isp->smk_flags & SMK_INODE_INSTANT)
		return;

	sbp = inode->i_sb;
	sbsp = smack_superblock(sbp);
	/*
	 * We're going to use the superblock default label
	 * if there's no label on the file.
	 */
	final = sbsp->smk_default;

	/*
	 * If this is the root inode the superblock
	 * may be in the process of initialization.
	 * If that is the case use the root value out
	 * of the superblock.
	 */
	if (opt_dentry->d_parent == opt_dentry) {
		switch (sbp->s_magic) {
		case CGROUP_SUPER_MAGIC:
		case CGROUP2_SUPER_MAGIC:
			/*
			 * The cgroup filesystem is never mounted,
			 * so there's no opportunity to set the mount
			 * options.
			 */
			sbsp->smk_root = &smack_known_star;
			sbsp->smk_default = &smack_known_star;
			isp->smk_inode = sbsp->smk_root;
			break;
		case TMPFS_MAGIC:
			/*
			 * What about shmem/tmpfs anonymous files with dentry
			 * obtained from d_alloc_pseudo()?
			 */
			isp->smk_inode = smk_of_current();
			break;
		case PIPEFS_MAGIC:
			isp->smk_inode = smk_of_current();
			break;
		case SOCKFS_MAGIC:
			/*
			 * Socket access is controlled by the socket
			 * structures associated with the task involved.
			 */
			isp->smk_inode = &smack_known_star;
			break;
		default:
			isp->smk_inode = sbsp->smk_root;
			break;
		}
		isp->smk_flags |= SMK_INODE_INSTANT;
		return;
	}

	/*
	 * This is pretty hackish.
	 * Casey says that we shouldn't have to do
	 * file system specific code, but it does help
	 * with keeping it simple.
	 */
	switch (sbp->s_magic) {
	case SMACK_MAGIC:
	case CGROUP_SUPER_MAGIC:
	case CGROUP2_SUPER_MAGIC:
		/*
		 * Casey says that it's a little embarrassing
		 * that the smack file system doesn't do
		 * extended attributes.
		 *
		 * Cgroupfs is special
		 */
		final = &smack_known_star;
		break;
	case DEVPTS_SUPER_MAGIC:
		/*
		 * devpts seems content with the label of the task.
		 * Programs that change smack have to treat the
		 * pty with respect.
		 */
		final = ckp;
		break;
	case PROC_SUPER_MAGIC:
		/*
		 * Casey says procfs appears not to care.
		 * The superblock default suffices.
		 */
		break;
	case TMPFS_MAGIC:
		/*
		 * Device labels should come from the filesystem,
		 * but watch out, because they're volitile,
		 * getting recreated on every reboot.
		 */
		final = &smack_known_star;
		/*
		 * If a smack value has been set we want to use it,
		 * but since tmpfs isn't giving us the opportunity
		 * to set mount options simulate setting the
		 * superblock default.
		 */
		fallthrough;
	default:
		/*
		 * This isn't an understood special case.
		 * Get the value from the xattr.
		 */

		/*
		 * UNIX domain sockets use lower level socket data.
		 */
		if (S_ISSOCK(inode->i_mode)) {
			final = &smack_known_star;
			break;
		}
		/*
		 * No xattr support means, alas, no SMACK label.
		 * Use the aforeapplied default.
		 * It would be curious if the label of the task
		 * does not match that assigned.
		 */
		if (!(inode->i_opflags & IOP_XATTR))
		        break;
		/*
		 * Get the dentry for xattr.
		 */
		dp = dget(opt_dentry);
		skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
		if (!IS_ERR_OR_NULL(skp))
			final = skp;

		/*
		 * Transmuting directory
		 */
		if (S_ISDIR(inode->i_mode)) {
			/*
			 * If this is a new directory and the label was
			 * transmuted when the inode was initialized
			 * set the transmute attribute on the directory
			 * and mark the inode.
			 *
			 * If there is a transmute attribute on the
			 * directory mark the inode.
			 */
			if (isp->smk_flags & SMK_INODE_CHANGED) {
				isp->smk_flags &= ~SMK_INODE_CHANGED;
				rc = __vfs_setxattr(&init_user_ns, dp, inode,
					XATTR_NAME_SMACKTRANSMUTE,
					TRANS_TRUE, TRANS_TRUE_SIZE,
					0);
			} else {
				rc = __vfs_getxattr(dp, inode,
					XATTR_NAME_SMACKTRANSMUTE, trattr,
					TRANS_TRUE_SIZE);
				if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
						       TRANS_TRUE_SIZE) != 0)
					rc = -EINVAL;
			}
			if (rc >= 0)
				transflag = SMK_INODE_TRANSMUTE;
		}
		/*
		 * Don't let the exec or mmap label be "*" or "@".
		 */
		skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
		if (IS_ERR(skp) || skp == &smack_known_star ||
		    skp == &smack_known_web)
			skp = NULL;
		isp->smk_task = skp;

		skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
		if (IS_ERR(skp) || skp == &smack_known_star ||
		    skp == &smack_known_web)
			skp = NULL;
		isp->smk_mmap = skp;

		dput(dp);
		break;
	}

	if (final == NULL)
		isp->smk_inode = ckp;
	else
		isp->smk_inode = final;

	isp->smk_flags |= (SMK_INODE_INSTANT | transflag);

	return;
}


static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid)
{
	int err = 0;

	if (skb_sid != SECSID_NULL)
		err = security_sid_mls_copy(&selinux_state, sk_sid, skb_sid,
					    conn_sid);
	else
		*conn_sid = sk_sid;

	return err;
}


static int smk_ipv6_check(struct smack_known *subject,
				struct smack_known *object,
				struct sockaddr_in6 *address, int act)
{
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
	ad.a.u.net->family = PF_INET6;
	ad.a.u.net->dport = ntohs(address->sin6_port);
	if (act == SMK_RECEIVING)
		ad.a.u.net->v6info.saddr = address->sin6_addr;
	else
		ad.a.u.net->v6info.daddr = address->sin6_addr;
#endif
	rc = smk_access(subject, object, MAY_WRITE, &ad);
	rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
	return rc;
}


static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
				int addrlen)
{
	int rc = 0;

	if (sock->sk == NULL)
		return 0;
	if (sock->sk->sk_family != PF_INET &&
	    (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6))
		return 0;
	if (addrlen < offsetofend(struct sockaddr, sa_family))
		return 0;
	if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) {
		struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
		struct smack_known *rsp = NULL;

		if (addrlen < SIN6_LEN_RFC2133)
			return 0;
		if (__is_defined(SMACK_IPV6_SECMARK_LABELING))
			rsp = smack_ipv6host_label(sip);
		if (rsp != NULL) {
			struct socket_smack *ssp = sock->sk->sk_security;

			rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
					    SMK_CONNECTING);
		}
		if (__is_defined(SMACK_IPV6_PORT_LABELING))
			rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);

		return rc;
	}
	if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
		return 0;
	rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap);
	return rc;
}


static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
	return security_sid_to_context(&selinux_state, secid,
				       secdata, seclen);
}


static struct inode_security_struct *inode_security(struct inode *inode)
{
	__inode_security_revalidate(inode, NULL, true);
	return selinux_inode(inode);
}


static int selinux_kernel_module_request(char *kmod_name)
{
	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_KMOD;
	ad.u.kmod_name = kmod_name;

	return avc_has_perm(&selinux_state,
			    current_sid(), SECINITSID_KERNEL, SECCLASS_SYSTEM,
			    SYSTEM__MODULE_REQUEST, &ad);
}


static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();

	isec = selinux_ipc(msq);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, SECCLASS_MSGQ,
			    MSGQ__ASSOCIATE, &ad);
}


static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
{
	if (inode)
		inode_doinit_with_dentry(inode, dentry);
}


static int selinux_watch_key(struct key *key)
{
	struct key_security_struct *ksec = key->security;
	u32 sid = current_sid();

	return avc_has_perm(&selinux_state,
			    sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
}


static void selinux_nf_ip_exit(void)
{
	pr_debug("SELinux:  Unregistering netfilter hooks\n");

	unregister_pernet_subsys(&selinux_net_ops);
}


static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
{
	struct smack_known **blob = smack_ipc(isp);

	return *blob;
}


static int selinux_socket_getpeername(struct socket *sock)
{
	return sock_has_perm(sock->sk, SOCKET__GETATTR);
}


static int smack_netlbl_add(struct sock *sk)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp = ssp->smk_out;
	int rc;

	local_bh_disable();
	bh_lock_sock_nested(sk);

	rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
	switch (rc) {
	case 0:
		ssp->smk_state = SMK_NETLBL_LABELED;
		break;
	case -EDESTADDRREQ:
		ssp->smk_state = SMK_NETLBL_REQSKB;
		rc = 0;
		break;
	}

	bh_unlock_sock(sk);
	local_bh_enable();

	return rc;
}


static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
{
	u16 family = sk->sk_family;
	struct sk_security_struct *sksec = sk->sk_security;

	/* handle mapped IPv4 packets arriving via IPv6 sockets */
	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;

	selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
}


static int selinux_inode_setxattr(struct user_namespace *mnt_userns,
				  struct dentry *dentry, const char *name,
				  const void *value, size_t size, int flags)
{
	struct inode *inode = d_backing_inode(dentry);
	struct inode_security_struct *isec;
	struct superblock_security_struct *sbsec;
	struct common_audit_data ad;
	u32 newsid, sid = current_sid();
	int rc = 0;

	if (strcmp(name, XATTR_NAME_SELINUX)) {
		rc = cap_inode_setxattr(dentry, name, value, size, flags);
		if (rc)
			return rc;

		/* Not an attribute we recognize, so just check the
		   ordinary setattr permission. */
		return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
	}

	if (!selinux_initialized(&selinux_state))
		return (inode_owner_or_capable(mnt_userns, inode) ? 0 : -EPERM);

	sbsec = selinux_superblock(inode->i_sb);
	if (!(sbsec->flags & SBLABEL_MNT))
		return -EOPNOTSUPP;

	if (!inode_owner_or_capable(mnt_userns, inode))
		return -EPERM;

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;

	isec = backing_inode_security(dentry);
	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, isec->sclass,
			  FILE__RELABELFROM, &ad);
	if (rc)
		return rc;

	rc = security_context_to_sid(&selinux_state, value, size, &newsid,
				     GFP_KERNEL);
	if (rc == -EINVAL) {
		if (!has_cap_mac_admin(true)) {
			struct audit_buffer *ab;
			size_t audit_size;

			/* We strip a nul only if it is at the end, otherwise the
			 * context contains a nul and we should audit that */
			if (value) {
				const char *str = value;

				if (str[size - 1] == '\0')
					audit_size = size - 1;
				else
					audit_size = size;
			} else {
				audit_size = 0;
			}
			ab = audit_log_start(audit_context(),
					     GFP_ATOMIC, AUDIT_SELINUX_ERR);
			if (!ab)
				return rc;
			audit_log_format(ab, "op=setxattr invalid_context=");
			audit_log_n_untrustedstring(ab, value, audit_size);
			audit_log_end(ab);

			return rc;
		}
		rc = security_context_to_sid_force(&selinux_state, value,
						   size, &newsid);
	}
	if (rc)
		return rc;

	rc = avc_has_perm(&selinux_state,
			  sid, newsid, isec->sclass,
			  FILE__RELABELTO, &ad);
	if (rc)
		return rc;

	rc = security_validate_transition(&selinux_state, isec->sid, newsid,
					  sid, isec->sclass);
	if (rc)
		return rc;

	return avc_has_perm(&selinux_state,
			    newsid,
			    sbsec->sid,
			    SECCLASS_FILESYSTEM,
			    FILESYSTEM__ASSOCIATE,
			    &ad);
}


static void selinux_tun_dev_free_security(void *security)
{
	kfree(security);
}


static int selinux_socket_socketpair(struct socket *socka,
				     struct socket *sockb)
{
	struct sk_security_struct *sksec_a = socka->sk->sk_security;
	struct sk_security_struct *sksec_b = sockb->sk->sk_security;

	sksec_a->peer_sid = sksec_b->sid;
	sksec_b->peer_sid = sksec_a->sid;

	return 0;
}


static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
			   int cap, unsigned int opts)
{
	return cred_has_capability(cred, cap, opts, ns == &init_user_ns);
}


static int selinux_binder_set_context_mgr(struct task_struct *mgr)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_binder(mgr), SECCLASS_BINDER,
			    BINDER__SET_CONTEXT_MGR, NULL);
}


static inline u32 cred_sid(const struct cred *cred)
{
	const struct task_security_struct *tsec;

	tsec = selinux_cred(cred);
	return tsec->sid;
}


static int bpf_fd_pass(struct file *file, u32 sid)
{
	struct bpf_security_struct *bpfsec;
	struct bpf_prog *prog;
	struct bpf_map *map;
	int ret;

	if (file->f_op == &bpf_map_fops) {
		map = file->private_data;
		bpfsec = map->security;
		ret = avc_has_perm(&selinux_state,
				   sid, bpfsec->sid, SECCLASS_BPF,
				   bpf_map_fmode_to_av(file->f_mode), NULL);
		if (ret)
			return ret;
	} else if (file->f_op == &bpf_prog_fops) {
		prog = file->private_data;
		bpfsec = prog->aux->security;
		ret = avc_has_perm(&selinux_state,
				   sid, bpfsec->sid, SECCLASS_BPF,
				   BPF__PROG_RUN, NULL);
		if (ret)
			return ret;
	}
	return 0;
}


static int selinux_bpf_map(struct bpf_map *map, fmode_t fmode)
{
	u32 sid = current_sid();
	struct bpf_security_struct *bpfsec;

	bpfsec = map->security;
	return avc_has_perm(&selinux_state,
			    sid, bpfsec->sid, SECCLASS_BPF,
			    bpf_map_fmode_to_av(fmode), NULL);
}


static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family,
					     struct sk_buff *skb)
{
	struct netlbl_lsm_secattr secattr;
	struct socket_smack *ssp = NULL;
	struct smack_known *skp = NULL;

	netlbl_secattr_init(&secattr);

	if (sk)
		ssp = sk->sk_security;

	if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) {
		skp = smack_from_secattr(&secattr, ssp);
		if (secattr.flags & NETLBL_SECATTR_CACHEABLE)
			netlbl_cache_add(skb, family, &skp->smk_netlabel);
	}

	netlbl_secattr_destroy(&secattr);

	return skp;
}


static int selinux_socket_connect(struct socket *sock,
				  struct sockaddr *address, int addrlen)
{
	int err;
	struct sock *sk = sock->sk;

	err = selinux_socket_connect_helper(sock, address, addrlen);
	if (err)
		return err;

	return selinux_netlbl_socket_connect(sk, address);
}


static int selinux_add_mnt_opt(const char *option, const char *val, int len,
			       void **mnt_opts)
{
	int token = Opt_error;
	int rc, i;

	for (i = 0; i < ARRAY_SIZE(tokens); i++) {
		if (strcmp(option, tokens[i].name) == 0) {
			token = tokens[i].opt;
			break;
		}
	}

	if (token == Opt_error)
		return -EINVAL;

	if (token != Opt_seclabel) {
		val = kmemdup_nul(val, len, GFP_KERNEL);
		if (!val) {
			rc = -ENOMEM;
			goto free_opt;
		}
	}
	rc = selinux_add_opt(token, val, mnt_opts);
	if (unlikely(rc)) {
		kfree(val);
		goto free_opt;
	}
	return rc;

free_opt:
	if (*mnt_opts) {
		selinux_free_mnt_opts(*mnt_opts);
		*mnt_opts = NULL;
	}
	return rc;
}


static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
	init_task_smack(smack_cred(cred), NULL, NULL);
	return 0;
}


static __init void init_smack_known_list(void)
{
	/*
	 * Initialize rule list locks
	 */
	mutex_init(&smack_known_huh.smk_rules_lock);
	mutex_init(&smack_known_hat.smk_rules_lock);
	mutex_init(&smack_known_floor.smk_rules_lock);
	mutex_init(&smack_known_star.smk_rules_lock);
	mutex_init(&smack_known_web.smk_rules_lock);
	/*
	 * Initialize rule lists
	 */
	INIT_LIST_HEAD(&smack_known_huh.smk_rules);
	INIT_LIST_HEAD(&smack_known_hat.smk_rules);
	INIT_LIST_HEAD(&smack_known_star.smk_rules);
	INIT_LIST_HEAD(&smack_known_floor.smk_rules);
	INIT_LIST_HEAD(&smack_known_web.smk_rules);
	/*
	 * Create the known labels list
	 */
	smk_insert_entry(&smack_known_huh);
	smk_insert_entry(&smack_known_hat);
	smk_insert_entry(&smack_known_star);
	smk_insert_entry(&smack_known_floor);
	smk_insert_entry(&smack_known_web);
}


static int selinux_file_ioctl(struct file *file, unsigned int cmd,
			      unsigned long arg)
{
	const struct cred *cred = current_cred();
	int error = 0;

	switch (cmd) {
	case FIONREAD:
	case FIBMAP:
	case FIGETBSZ:
	case FS_IOC_GETFLAGS:
	case FS_IOC_GETVERSION:
		error = file_has_perm(cred, file, FILE__GETATTR);
		break;

	case FS_IOC_SETFLAGS:
	case FS_IOC_SETVERSION:
		error = file_has_perm(cred, file, FILE__SETATTR);
		break;

	/* sys_ioctl() checks */
	case FIONBIO:
	case FIOASYNC:
		error = file_has_perm(cred, file, 0);
		break;

	case KDSKBENT:
	case KDSKBSENT:
		error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
					    CAP_OPT_NONE, true);
		break;

	/* default case assumes that the command will go
	 * to the file's ioctl() function.
	 */
	default:
		error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
	}
	return error;
}


static unsigned int selinux_ipv6_postroute(void *priv,
					   struct sk_buff *skb,
					   const struct nf_hook_state *state)
{
	return selinux_ip_postroute(skb, state->out, PF_INET6);
}


static int selinux_inode_removexattr(struct user_namespace *mnt_userns,
				     struct dentry *dentry, const char *name)
{
	if (strcmp(name, XATTR_NAME_SELINUX)) {
		int rc = cap_inode_removexattr(mnt_userns, dentry, name);
		if (rc)
			return rc;

		/* Not an attribute we recognize, so just check the
		   ordinary setattr permission. */
		return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
	}

	if (!selinux_initialized(&selinux_state))
		return 0;

	/* No one is allowed to remove a SELinux security label.
	   You can change the label, but all data must be labeled. */
	return -EACCES;
}


static int selinux_inode_getattr(const struct path *path)
{
	return path_has_perm(current_cred(), path, FILE__GETATTR);
}


static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val)
{
	struct common_audit_data ad;
	int err;
	u32 sid = 0;
	struct ib_security_struct *sec = ib_sec;
	struct lsm_ibpkey_audit ibpkey;

	err = sel_ib_pkey_sid(subnet_prefix, pkey_val, &sid);
	if (err)
		return err;

	ad.type = LSM_AUDIT_DATA_IBPKEY;
	ibpkey.subnet_prefix = subnet_prefix;
	ibpkey.pkey = pkey_val;
	ad.u.ibpkey = &ibpkey;
	return avc_has_perm(&selinux_state,
			    sec->sid, sid,
			    SECCLASS_INFINIBAND_PKEY,
			    INFINIBAND_PKEY__ACCESS, &ad);
}


static int smack_socket_getpeersec_stream(struct socket *sock,
					  char __user *optval,
					  int __user *optlen, unsigned len)
{
	struct socket_smack *ssp;
	char *rcp = "";
	int slen = 1;
	int rc = 0;

	ssp = sock->sk->sk_security;
	if (ssp->smk_packet != NULL) {
		rcp = ssp->smk_packet->smk_known;
		slen = strlen(rcp) + 1;
	}

	if (slen > len)
		rc = -ERANGE;
	else if (copy_to_user(optval, rcp, slen) != 0)
		rc = -EFAULT;

	if (put_user(slen, optlen) != 0)
		rc = -EFAULT;

	return rc;
}


static unsigned int selinux_ipv4_forward(void *priv,
					 struct sk_buff *skb,
					 const struct nf_hook_state *state)
{
	return selinux_ip_forward(skb, state->in, PF_INET);
}


static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	u32 osid, sid;
	int rc;

	osid = tsec->osid;
	sid = tsec->sid;

	if (sid == osid)
		return;

	/* Check whether the new SID can inherit signal state from the old SID.
	 * If not, clear itimers to avoid subsequent signal generation and
	 * flush and unblock signals.
	 *
	 * This must occur _after_ the task SID has been updated so that any
	 * kill done after the flush will be checked against the new SID.
	 */
	rc = avc_has_perm(&selinux_state,
			  osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
	if (rc) {
		clear_itimer();

		spin_lock_irq(&current->sighand->siglock);
		if (!fatal_signal_pending(current)) {
			flush_sigqueue(&current->pending);
			flush_sigqueue(&current->signal->shared_pending);
			flush_signal_handlers(current, 1);
			sigemptyset(&current->blocked);
			recalc_sigpending();
		}
		spin_unlock_irq(&current->sighand->siglock);
	}

	/* Wake up the parent if it is waiting so that it can recheck
	 * wait permission to the new task SID. */
	read_lock(&tasklist_lock);
	__wake_up_parent(current, current->real_parent);
	read_unlock(&tasklist_lock);
}


static int __net_init selinux_nf_register(struct net *net)
{
	return nf_register_net_hooks(net, selinux_nf_ops,
				     ARRAY_SIZE(selinux_nf_ops));
}


static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{
	struct smack_known *skp = smk_of_inode(inode);

	*ctx = skp->smk_known;
	*ctxlen = strlen(skp->smk_known);
	return 0;
}


static int smack_add_opt(int token, const char *s, void **mnt_opts)
{
	struct smack_mnt_opts *opts = *mnt_opts;

	if (!opts) {
		opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
		if (!opts)
			return -ENOMEM;
		*mnt_opts = opts;
	}
	if (!s)
		return -ENOMEM;

	switch (token) {
	case Opt_fsdefault:
		if (opts->fsdefault)
			goto out_opt_err;
		opts->fsdefault = s;
		break;
	case Opt_fsfloor:
		if (opts->fsfloor)
			goto out_opt_err;
		opts->fsfloor = s;
		break;
	case Opt_fshat:
		if (opts->fshat)
			goto out_opt_err;
		opts->fshat = s;
		break;
	case Opt_fsroot:
		if (opts->fsroot)
			goto out_opt_err;
		opts->fsroot = s;
		break;
	case Opt_fstransmute:
		if (opts->fstransmute)
			goto out_opt_err;
		opts->fstransmute = s;
		break;
	}
	return 0;

out_opt_err:
	pr_warn("Smack: duplicate mount options\n");
	return -EINVAL;
}


static int smack_flags_to_may(int flags)
{
	int may = 0;

	if (flags & S_IRUGO)
		may |= MAY_READ;
	if (flags & S_IWUGO)
		may |= MAY_WRITE;
	if (flags & S_IXUGO)
		may |= MAY_EXEC;

	return may;
}


static int selinux_socket_unix_stream_connect(struct sock *sock,
					      struct sock *other,
					      struct sock *newsk)
{
	struct sk_security_struct *sksec_sock = sock->sk_security;
	struct sk_security_struct *sksec_other = other->sk_security;
	struct sk_security_struct *sksec_new = newsk->sk_security;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	int err;

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->sk = other;

	err = avc_has_perm(&selinux_state,
			   sksec_sock->sid, sksec_other->sid,
			   sksec_other->sclass,
			   UNIX_STREAM_SOCKET__CONNECTTO, &ad);
	if (err)
		return err;

	/* server child socket */
	sksec_new->peer_sid = sksec_sock->sid;
	err = security_sid_mls_copy(&selinux_state, sksec_other->sid,
				    sksec_sock->sid, &sksec_new->sid);
	if (err)
		return err;

	/* connecting socket */
	sksec_sock->peer_sid = sksec_new->sid;

	return 0;
}


static int selinux_syslog(int type)
{
	switch (type) {
	case SYSLOG_ACTION_READ_ALL:	/* Read last kernel messages */
	case SYSLOG_ACTION_SIZE_BUFFER:	/* Return size of the log buffer */
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__SYSLOG_READ, NULL);
	case SYSLOG_ACTION_CONSOLE_OFF:	/* Disable logging to console */
	case SYSLOG_ACTION_CONSOLE_ON:	/* Enable logging to console */
	/* Set level of messages printed to console */
	case SYSLOG_ACTION_CONSOLE_LEVEL:
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__SYSLOG_CONSOLE,
				    NULL);
	}
	/* All other syslog types */
	return avc_has_perm(&selinux_state,
			    current_sid(), SECINITSID_KERNEL,
			    SECCLASS_SYSTEM, SYSTEM__SYSLOG_MOD, NULL);
}


static int selinux_secmark_relabel_packet(u32 sid)
{
	const struct task_security_struct *__tsec;
	u32 tsid;

	__tsec = selinux_cred(current_cred());
	tsid = __tsec->sid;

	return avc_has_perm(&selinux_state,
			    tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO,
			    NULL);
}


static int smack_fs_context_dup(struct fs_context *fc,
				struct fs_context *src_fc)
{
	struct smack_mnt_opts *dst, *src = src_fc->security;

	if (!src)
		return 0;

	fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
	if (!fc->security)
		return -ENOMEM;
	dst = fc->security;

	if (src->fsdefault) {
		dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL);
		if (!dst->fsdefault)
			return -ENOMEM;
	}
	if (src->fsfloor) {
		dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL);
		if (!dst->fsfloor)
			return -ENOMEM;
	}
	if (src->fshat) {
		dst->fshat = kstrdup(src->fshat, GFP_KERNEL);
		if (!dst->fshat)
			return -ENOMEM;
	}
	if (src->fsroot) {
		dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL);
		if (!dst->fsroot)
			return -ENOMEM;
	}
	if (src->fstransmute) {
		dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL);
		if (!dst->fstransmute)
			return -ENOMEM;
	}
	return 0;
}


static int selinux_key_permission(key_ref_t key_ref,
				  const struct cred *cred,
				  enum key_need_perm need_perm)
{
	struct key *key;
	struct key_security_struct *ksec;
	u32 perm, sid;

	switch (need_perm) {
	case KEY_NEED_VIEW:
		perm = KEY__VIEW;
		break;
	case KEY_NEED_READ:
		perm = KEY__READ;
		break;
	case KEY_NEED_WRITE:
		perm = KEY__WRITE;
		break;
	case KEY_NEED_SEARCH:
		perm = KEY__SEARCH;
		break;
	case KEY_NEED_LINK:
		perm = KEY__LINK;
		break;
	case KEY_NEED_SETATTR:
		perm = KEY__SETATTR;
		break;
	case KEY_NEED_UNLINK:
	case KEY_SYSADMIN_OVERRIDE:
	case KEY_AUTHTOKEN_OVERRIDE:
	case KEY_DEFER_PERM_CHECK:
		return 0;
	default:
		WARN_ON(1);
		return -EPERM;

	}

	sid = cred_sid(cred);
	key = key_ref_to_ptr(key_ref);
	ksec = key->security;

	return avc_has_perm(&selinux_state,
			    sid, ksec->sid, SECCLASS_KEY, perm, NULL);
}


static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
	struct smack_known **blob = smack_msg_msg(msg);

	*blob = smk_of_current();
	return 0;
}


static int smack_task_setioprio(struct task_struct *p, int ioprio)
{
	return smk_curacc_on_task(p, MAY_WRITE, __func__);
}


static int selinux_task_prlimit(const struct cred *cred, const struct cred *tcred,
				unsigned int flags)
{
	u32 av = 0;

	if (!flags)
		return 0;
	if (flags & LSM_PRLIMIT_WRITE)
		av |= PROCESS__SETRLIMIT;
	if (flags & LSM_PRLIMIT_READ)
		av |= PROCESS__GETRLIMIT;
	return avc_has_perm(&selinux_state,
			    cred_sid(cred), cred_sid(tcred),
			    SECCLASS_PROCESS, av, NULL);
}


static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
			    struct dentry *new_dentry)
{
	struct smack_known *isp;
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);

	isp = smk_of_inode(d_backing_inode(old_dentry));
	rc = smk_curacc(isp, MAY_WRITE, &ad);
	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);

	if (rc == 0 && d_is_positive(new_dentry)) {
		isp = smk_of_inode(d_backing_inode(new_dentry));
		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
		rc = smk_curacc(isp, MAY_WRITE, &ad);
		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
	}

	return rc;
}


static void selinux_bpf_prog_free(struct bpf_prog_aux *aux)
{
	struct bpf_security_struct *bpfsec = aux->security;

	aux->security = NULL;
	kfree(bpfsec);
}


static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
{
	return may_link(dir, old_dentry, MAY_LINK);
}


static int selinux_is_genfs_special_handling(struct super_block *sb)
{
	/* Special handling. Genfs but also in-core setxattr handler */
	return	!strcmp(sb->s_type->name, "sysfs") ||
		!strcmp(sb->s_type->name, "pstore") ||
		!strcmp(sb->s_type->name, "debugfs") ||
		!strcmp(sb->s_type->name, "tracefs") ||
		!strcmp(sb->s_type->name, "rootfs") ||
		(selinux_policycap_cgroupseclabel() &&
		 (!strcmp(sb->s_type->name, "cgroup") ||
		  !strcmp(sb->s_type->name, "cgroup2")));
}


static int selinux_socket_create(int family, int type,
				 int protocol, int kern)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	u32 newsid;
	u16 secclass;
	int rc;

	if (kern)
		return 0;

	secclass = socket_type_to_security_class(family, type, protocol);
	rc = socket_sockcreate_sid(tsec, secclass, &newsid);
	if (rc)
		return rc;

	return avc_has_perm(&selinux_state,
			    tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
}


static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
{
	struct smack_known **blob = smack_ipc(ipp);
	struct smack_known *iskp = *blob;

	*secid = iskp->smk_secid;
}


static unsigned int selinux_ip_output(struct sk_buff *skb,
				      u16 family)
{
	struct sock *sk;
	u32 sid;

	if (!netlbl_enabled())
		return NF_ACCEPT;

	/* we do this in the LOCAL_OUT path and not the POST_ROUTING path
	 * because we want to make sure we apply the necessary labeling
	 * before IPsec is applied so we can leverage AH protection */
	sk = skb->sk;
	if (sk) {
		struct sk_security_struct *sksec;

		if (sk_listener(sk))
			/* if the socket is the listening state then this
			 * packet is a SYN-ACK packet which means it needs to
			 * be labeled based on the connection/request_sock and
			 * not the parent socket.  unfortunately, we can't
			 * lookup the request_sock yet as it isn't queued on
			 * the parent socket until after the SYN-ACK is sent.
			 * the "solution" is to simply pass the packet as-is
			 * as any IP option based labeling should be copied
			 * from the initial connection request (in the IP
			 * layer).  it is far from ideal, but until we get a
			 * security label in the packet itself this is the
			 * best we can do. */
			return NF_ACCEPT;

		/* standard practice, label using the parent socket */
		sksec = sk->sk_security;
		sid = sksec->sid;
	} else
		sid = SECINITSID_KERNEL;
	if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
		return NF_DROP;

	return NF_ACCEPT;
}


static int selinux_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
{
	int err;
	int perms;

	switch (cmd) {
	case IPC_INFO:
	case MSG_INFO:
		/* No specific object, just general system-wide information. */
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
	case IPC_STAT:
	case MSG_STAT:
	case MSG_STAT_ANY:
		perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
		break;
	case IPC_SET:
		perms = MSGQ__SETATTR;
		break;
	case IPC_RMID:
		perms = MSGQ__DESTROY;
		break;
	default:
		return 0;
	}

	err = ipc_has_perm(msq, perms);
	return err;
}


static void smack_cred_free(struct cred *cred)
{
	struct task_smack *tsp = smack_cred(cred);
	struct smack_rule *rp;
	struct list_head *l;
	struct list_head *n;

	smk_destroy_label_list(&tsp->smk_relabel);

	list_for_each_safe(l, n, &tsp->smk_rules) {
		rp = list_entry(l, struct smack_rule, list);
		list_del(&rp->list);
		kmem_cache_free(smack_rule_cache, rp);
	}
}


static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg)
{
	int may;

	may = smack_flags_to_may(shmflg);
	return smk_curacc_shm(isp, may);
}


static int smack_inode_alloc_security(struct inode *inode)
{
	struct smack_known *skp = smk_of_current();

	init_inode_smack(inode, skp);
	return 0;
}


static void selinux_inode_invalidate_secctx(struct inode *inode)
{
	struct inode_security_struct *isec = selinux_inode(inode);

	spin_lock(&isec->lock);
	isec->initialized = LABEL_INVALID;
	spin_unlock(&isec->lock);
}


static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
				      const void *value, size_t size, int flags)
{
	struct smack_known *skp;
	struct inode_smack *isp = smack_inode(d_backing_inode(dentry));

	if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
		isp->smk_flags |= SMK_INODE_TRANSMUTE;
		return;
	}

	if (strcmp(name, XATTR_NAME_SMACK) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_inode = skp;
	} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_task = skp;
	} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_mmap = skp;
	}

	return;
}


static int smack_watch_key(struct key *key)
{
	struct smk_audit_info ad;
	struct smack_known *tkp = smk_of_current();
	int rc;

	if (key == NULL)
		return -EINVAL;
	/*
	 * If the key hasn't been initialized give it access so that
	 * it may do so.
	 */
	if (key->security == NULL)
		return 0;
	/*
	 * This should not occur
	 */
	if (tkp == NULL)
		return -EACCES;

	if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred()))
		return 0;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
	ad.a.u.key_struct.key = key->serial;
	ad.a.u.key_struct.key_desc = key->description;
#endif
	rc = smk_access(tkp, key->security, MAY_READ, &ad);
	rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc);
	return rc;
}


static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
					  struct qstr *name,
					  const struct cred *old,
					  struct cred *new)
{
	u32 newsid;
	int rc;
	struct task_security_struct *tsec;

	rc = selinux_determine_inode_label(selinux_cred(old),
					   d_inode(dentry->d_parent), name,
					   inode_mode_to_security_class(mode),
					   &newsid);
	if (rc)
		return rc;

	tsec = selinux_cred(new);
	tsec->create_sid = newsid;
	return 0;
}


static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg,
			struct task_struct *target, long type, int mode)
{
	return smk_curacc_msq(isp, MAY_READWRITE);
}


static int selinux_mount(const char *dev_name,
			 const struct path *path,
			 const char *type,
			 unsigned long flags,
			 void *data)
{
	const struct cred *cred = current_cred();

	if (flags & MS_REMOUNT)
		return superblock_has_perm(cred, path->dentry->d_sb,
					   FILESYSTEM__REMOUNT, NULL);
	else
		return path_has_perm(cred, path, FILE__MOUNTON);
}


static int smk_curacc_msq(struct kern_ipc_perm *isp, int access)
{
	struct smack_known *msp = smack_of_ipc(isp);
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
	ad.a.u.ipc_id = isp->id;
#endif
	rc = smk_curacc(msp, access, &ad);
	rc = smk_bu_current("msq", msp, access, rc);
	return rc;
}


static int smack_fs_context_parse_param(struct fs_context *fc,
					struct fs_parameter *param)
{
	struct fs_parse_result result;
	int opt, rc;

	opt = fs_parse(fc, smack_fs_parameters, param, &result);
	if (opt < 0)
		return opt;

	rc = smack_add_opt(opt, param->string, &fc->security);
	if (!rc)
		param->string = NULL;
	return rc;
}


static int selinux_is_sblabel_mnt(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = selinux_superblock(sb);

	/*
	 * IMPORTANT: Double-check logic in this function when adding a new
	 * SECURITY_FS_USE_* definition!
	 */
	BUILD_BUG_ON(SECURITY_FS_USE_MAX != 7);

	switch (sbsec->behavior) {
	case SECURITY_FS_USE_XATTR:
	case SECURITY_FS_USE_TRANS:
	case SECURITY_FS_USE_TASK:
	case SECURITY_FS_USE_NATIVE:
		return 1;

	case SECURITY_FS_USE_GENFS:
		return selinux_is_genfs_special_handling(sb);

	/* Never allow relabeling on context mounts */
	case SECURITY_FS_USE_MNTPOINT:
	case SECURITY_FS_USE_NONE:
	default:
		return 0;
	}
}


static int smack_audit_rule_known(struct audit_krule *krule)
{
	struct audit_field *f;
	int i;

	for (i = 0; i < krule->field_count; i++) {
		f = &krule->fields[i];

		if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
			return 1;
	}

	return 0;
}


static int __inode_security_revalidate(struct inode *inode,
				       struct dentry *dentry,
				       bool may_sleep)
{
	struct inode_security_struct *isec = selinux_inode(inode);

	might_sleep_if(may_sleep);

	if (selinux_initialized(&selinux_state) &&
	    isec->initialized != LABEL_INITIALIZED) {
		if (!may_sleep)
			return -ECHILD;

		/*
		 * Try reloading the inode security label.  This will fail if
		 * @opt_dentry is NULL and no dentry for this inode can be
		 * found; in that case, continue using the old label.
		 */
		inode_doinit_with_dentry(inode, dentry);
	}
	return 0;
}


static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
{
	u8 nexthdr;
	int offset;
	int proto = -EINVAL;
	struct ipv6hdr _ipv6h;
	struct ipv6hdr *ip6;
	__be16 frag_off;
	struct tcphdr _tcph, *th;
	struct udphdr _udph, *uh;
	struct dccp_hdr _dccph, *dh;

	sip->sin6_port = 0;

	offset = skb_network_offset(skb);
	ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
	if (ip6 == NULL)
		return -EINVAL;
	sip->sin6_addr = ip6->saddr;

	nexthdr = ip6->nexthdr;
	offset += sizeof(_ipv6h);
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		return -EINVAL;

	proto = nexthdr;
	switch (proto) {
	case IPPROTO_TCP:
		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th != NULL)
			sip->sin6_port = th->source;
		break;
	case IPPROTO_UDP:
	case IPPROTO_UDPLITE:
		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh != NULL)
			sip->sin6_port = uh->source;
		break;
	case IPPROTO_DCCP:
		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh != NULL)
			sip->sin6_port = dh->dccph_sport;
		break;
	}
	return proto;
}


static void smack_key_free(struct key *key)
{
	key->security = NULL;
}


static int selinux_perf_event_open(struct perf_event_attr *attr, int type)
{
	u32 requested, sid = current_sid();

	if (type == PERF_SECURITY_OPEN)
		requested = PERF_EVENT__OPEN;
	else if (type == PERF_SECURITY_CPU)
		requested = PERF_EVENT__CPU;
	else if (type == PERF_SECURITY_KERNEL)
		requested = PERF_EVENT__KERNEL;
	else if (type == PERF_SECURITY_TRACEPOINT)
		requested = PERF_EVENT__TRACEPOINT;
	else
		return -EINVAL;

	return avc_has_perm(&selinux_state, sid, sid, SECCLASS_PERF_EVENT,
			    requested, NULL);
}


static int selinux_socket_getsockopt(struct socket *sock, int level,
				     int optname)
{
	return sock_has_perm(sock->sk, SOCKET__GETOPT);
}


static int parse_sid(struct super_block *sb, const char *s, u32 *sid)
{
	int rc = security_context_str_to_sid(&selinux_state, s,
					     sid, GFP_KERNEL);
	if (rc)
		pr_warn("SELinux: security_context_str_to_sid"
		       "(%s) failed for (dev %s, type %s) errno=%d\n",
		       s, sb->s_id, sb->s_type->name, rc);
	return rc;
}


static int check_nnp_nosuid(const struct linux_binprm *bprm,
			    const struct task_security_struct *old_tsec,
			    const struct task_security_struct *new_tsec)
{
	int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
	int nosuid = !mnt_may_suid(bprm->file->f_path.mnt);
	int rc;
	u32 av;

	if (!nnp && !nosuid)
		return 0; /* neither NNP nor nosuid */

	if (new_tsec->sid == old_tsec->sid)
		return 0; /* No change in credentials */

	/*
	 * If the policy enables the nnp_nosuid_transition policy capability,
	 * then we permit transitions under NNP or nosuid if the
	 * policy allows the corresponding permission between
	 * the old and new contexts.
	 */
	if (selinux_policycap_nnp_nosuid_transition()) {
		av = 0;
		if (nnp)
			av |= PROCESS2__NNP_TRANSITION;
		if (nosuid)
			av |= PROCESS2__NOSUID_TRANSITION;
		rc = avc_has_perm(&selinux_state,
				  old_tsec->sid, new_tsec->sid,
				  SECCLASS_PROCESS2, av, NULL);
		if (!rc)
			return 0;
	}

	/*
	 * We also permit NNP or nosuid transitions to bounded SIDs,
	 * i.e. SIDs that are guaranteed to only be allowed a subset
	 * of the permissions of the current SID.
	 */
	rc = security_bounded_transition(&selinux_state, old_tsec->sid,
					 new_tsec->sid);
	if (!rc)
		return 0;

	/*
	 * On failure, preserve the errno values for NNP vs nosuid.
	 * NNP:  Operation not permitted for caller.
	 * nosuid:  Permission denied to file.
	 */
	if (nnp)
		return -EPERM;
	return -EACCES;
}


static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
			   unsigned nsops, int alter)
{
	return smk_curacc_sem(isp, MAY_READWRITE);
}


static int ioctl_has_perm(const struct cred *cred, struct file *file,
		u32 requested, u16 cmd)
{
	struct common_audit_data ad;
	struct file_security_struct *fsec = selinux_file(file);
	struct inode *inode = file_inode(file);
	struct inode_security_struct *isec;
	struct lsm_ioctlop_audit ioctl;
	u32 ssid = cred_sid(cred);
	int rc;
	u8 driver = cmd >> 8;
	u8 xperm = cmd & 0xff;

	ad.type = LSM_AUDIT_DATA_IOCTL_OP;
	ad.u.op = &ioctl;
	ad.u.op->cmd = cmd;
	ad.u.op->path = file->f_path;

	if (ssid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  ssid, fsec->sid,
				SECCLASS_FD,
				FD__USE,
				&ad);
		if (rc)
			goto out;
	}

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	isec = inode_security(inode);
	rc = avc_has_extended_perms(&selinux_state,
				    ssid, isec->sid, isec->sclass,
				    requested, driver, xperm, &ad);
out:
	return rc;
}


static int selinux_ptrace_access_check(struct task_struct *child,
				       unsigned int mode)
{
	u32 sid = current_sid();
	u32 csid = task_sid_obj(child);

	if (mode & PTRACE_MODE_READ)
		return avc_has_perm(&selinux_state,
				    sid, csid, SECCLASS_FILE, FILE__READ, NULL);

	return avc_has_perm(&selinux_state,
			    sid, csid, SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
}


static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass)
{
	isec->sclass = sclass;
	isec->sid = current_sid();
}


static int selinux_inode_listxattr(struct dentry *dentry)
{
	const struct cred *cred = current_cred();

	return dentry_has_perm(cred, dentry, FILE__GETATTR);
}


static int selinux_inode_init_security_anon(struct inode *inode,
					    const struct qstr *name,
					    const struct inode *context_inode)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct common_audit_data ad;
	struct inode_security_struct *isec;
	int rc;

	if (unlikely(!selinux_initialized(&selinux_state)))
		return 0;

	isec = selinux_inode(inode);

	/*
	 * We only get here once per ephemeral inode.  The inode has
	 * been initialized via inode_alloc_security but is otherwise
	 * untouched.
	 */

	if (context_inode) {
		struct inode_security_struct *context_isec =
			selinux_inode(context_inode);
		if (context_isec->initialized != LABEL_INITIALIZED) {
			pr_err("SELinux:  context_inode is not initialized");
			return -EACCES;
		}

		isec->sclass = context_isec->sclass;
		isec->sid = context_isec->sid;
	} else {
		isec->sclass = SECCLASS_ANON_INODE;
		rc = security_transition_sid(
			&selinux_state, tsec->sid, tsec->sid,
			isec->sclass, name, &isec->sid);
		if (rc)
			return rc;
	}

	isec->initialized = LABEL_INITIALIZED;
	/*
	 * Now that we've initialized security, check whether we're
	 * allowed to actually create this type of anonymous inode.
	 */

	ad.type = LSM_AUDIT_DATA_INODE;
	ad.u.inode = inode;

	return avc_has_perm(&selinux_state,
			    tsec->sid,
			    isec->sid,
			    isec->sclass,
			    FILE__CREATE,
			    &ad);
}


static int selinux_ib_endport_manage_subnet(void *ib_sec, const char *dev_name,
					    u8 port_num)
{
	struct common_audit_data ad;
	int err;
	u32 sid = 0;
	struct ib_security_struct *sec = ib_sec;
	struct lsm_ibendport_audit ibendport;

	err = security_ib_endport_sid(&selinux_state, dev_name, port_num,
				      &sid);

	if (err)
		return err;

	ad.type = LSM_AUDIT_DATA_IBENDPORT;
	ibendport.dev_name = dev_name;
	ibendport.port = port_num;
	ad.u.ibendport = &ibendport;
	return avc_has_perm(&selinux_state,
			    sec->sid, sid,
			    SECCLASS_INFINIBAND_ENDPORT,
			    INFINIBAND_ENDPORT__MANAGE_SUBNET, &ad);
}


static void selinux_cred_transfer(struct cred *new, const struct cred *old)
{
	const struct task_security_struct *old_tsec = selinux_cred(old);
	struct task_security_struct *tsec = selinux_cred(new);

	*tsec = *old_tsec;
}


static void smk_bu_mode(int mode, char *s)
{
	int i = 0;

	if (mode & MAY_READ)
		s[i++] = 'r';
	if (mode & MAY_WRITE)
		s[i++] = 'w';
	if (mode & MAY_EXEC)
		s[i++] = 'x';
	if (mode & MAY_APPEND)
		s[i++] = 'a';
	if (mode & MAY_TRANSMUTE)
		s[i++] = 't';
	if (mode & MAY_LOCK)
		s[i++] = 'l';
	if (i == 0)
		s[i++] = '-';
	s[i] = '\0';
}


static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
				    char *addrp, u16 family, u32 peer_sid,
				    struct common_audit_data *ad)
{
	int err;
	u32 if_sid;
	u32 node_sid;

	err = sel_netif_sid(ns, ifindex, &if_sid);
	if (err)
		return err;
	err = avc_has_perm(&selinux_state,
			   peer_sid, if_sid,
			   SECCLASS_NETIF, NETIF__INGRESS, ad);
	if (err)
		return err;

	err = sel_netnode_sid(addrp, family, &node_sid);
	if (err)
		return err;
	return avc_has_perm(&selinux_state,
			    peer_sid, node_sid,
			    SECCLASS_NODE, NODE__RECVFROM, ad);
}


static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
				      struct sk_buff *skb)
{
	struct sk_security_struct *sksec = ep->base.sk->sk_security;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	u8 peerlbl_active;
	u32 peer_sid = SECINITSID_UNLABELED;
	u32 conn_sid;
	int err = 0;

	if (!selinux_policycap_extsockclass())
		return 0;

	peerlbl_active = selinux_peerlbl_enabled();

	if (peerlbl_active) {
		/* This will return peer_sid = SECSID_NULL if there are
		 * no peer labels, see security_net_peersid_resolve().
		 */
		err = selinux_skb_peerlbl_sid(skb, ep->base.sk->sk_family,
					      &peer_sid);
		if (err)
			return err;

		if (peer_sid == SECSID_NULL)
			peer_sid = SECINITSID_UNLABELED;
	}

	if (sksec->sctp_assoc_state == SCTP_ASSOC_UNSET) {
		sksec->sctp_assoc_state = SCTP_ASSOC_SET;

		/* Here as first association on socket. As the peer SID
		 * was allowed by peer recv (and the netif/node checks),
		 * then it is approved by policy and used as the primary
		 * peer SID for getpeercon(3).
		 */
		sksec->peer_sid = peer_sid;
	} else if  (sksec->peer_sid != peer_sid) {
		/* Other association peer SIDs are checked to enforce
		 * consistency among the peer SIDs.
		 */
		ad.type = LSM_AUDIT_DATA_NET;
		ad.u.net = &net;
		ad.u.net->sk = ep->base.sk;
		err = avc_has_perm(&selinux_state,
				   sksec->peer_sid, peer_sid, sksec->sclass,
				   SCTP_SOCKET__ASSOCIATION, &ad);
		if (err)
			return err;
	}

	/* Compute the MLS component for the connection and store
	 * the information in ep. This will be used by SCTP TCP type
	 * sockets and peeled off connections as they cause a new
	 * socket to be generated. selinux_sctp_sk_clone() will then
	 * plug this into the new socket.
	 */
	err = selinux_conn_sid(sksec->sid, peer_sid, &conn_sid);
	if (err)
		return err;

	ep->secid = conn_sid;
	ep->peer_secid = peer_sid;

	/* Set any NetLabel labels including CIPSO/CALIPSO options. */
	return selinux_netlbl_sctp_assoc_request(ep, skb);
}


static int smk_bu_credfile(const struct cred *cred, struct file *file,
				int mode, int rc)
{
	struct task_smack *tsp = smack_cred(cred);
	struct smack_known *sskp = tsp->smk_task;
	struct inode *inode = file_inode(file);
	struct inode_smack *isp = smack_inode(inode);
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (isp->smk_flags & SMK_INODE_IMPURE)
		pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
			inode->i_sb->s_id, inode->i_ino, current->comm);

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
		sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
		inode->i_sb->s_id, inode->i_ino, file,
		current->comm);
	return 0;
}


static int selinux_mmap_addr(unsigned long addr)
{
	int rc = 0;

	if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
		u32 sid = current_sid();
		rc = avc_has_perm(&selinux_state,
				  sid, sid, SECCLASS_MEMPROTECT,
				  MEMPROTECT__MMAP_ZERO, NULL);
	}

	return rc;
}


static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
				    struct task_struct *target,
				    long type, int mode)
{
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct common_audit_data ad;
	u32 sid = task_sid_obj(target);
	int rc;

	isec = selinux_ipc(msq);
	msec = selinux_msg_msg(msg);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid,
			  SECCLASS_MSGQ, MSGQ__READ, &ad);
	if (!rc)
		rc = avc_has_perm(&selinux_state,
				  sid, msec->sid,
				  SECCLASS_MSG, MSG__RECEIVE, &ad);
	return rc;
}