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 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;

		 
		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;

			 
			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);
}