2915 DTrace in a zone should see "cpu", "curpsinfo", et al
2916 DTrace in a zone should be able to access fds[]
2917 DTrace in a zone should have limited provider access
Reviewed by: Joshua M. Clulow <josh@sysmgr.org>
Reviewed by: Adam Leventhal <ahl@delphix.com>

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  
  #include <sys/sdt_impl.h>
  
  static dtrace_pattr_t vtrace_attr = {
*** 95,124 ****
  { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
  { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
  };
  
  sdt_provider_t sdt_providers[] = {
!         { "vtrace", "__vtrace_", &vtrace_attr, 0 },
!         { "sysinfo", "__cpu_sysinfo_", &info_attr, 0 },
!         { "vminfo", "__cpu_vminfo_", &info_attr, 0 },
!         { "fpuinfo", "__fpuinfo_", &fpu_attr, 0 },
!         { "sched", "__sched_", &stab_attr, 0 },
!         { "proc", "__proc_", &stab_attr, 0 },
!         { "io", "__io_", &stab_attr, 0 },
!         { "ip", "__ip_", &stab_attr, 0 },
!         { "tcp", "__tcp_", &stab_attr, 0 },
!         { "udp", "__udp_", &stab_attr, 0 },
!         { "mib", "__mib_", &stab_attr, 0 },
!         { "fsinfo", "__fsinfo_", &fsinfo_attr, 0 },
!         { "iscsi", "__iscsi_", &iscsi_attr, 0 },
!         { "nfsv3", "__nfsv3_", &stab_attr, 0 },
!         { "nfsv4", "__nfsv4_", &stab_attr, 0 },
!         { "xpv", "__xpv_", &xpv_attr, 0 },
!         { "fc", "__fc_", &fc_attr, 0 },
!         { "srp", "__srp_", &fc_attr, 0 },
!         { "sysevent", "__sysevent_", &stab_attr, 0 },
!         { "sdt", NULL, &sdt_attr, 0 },
          { NULL }
  };
  
  sdt_argdesc_t sdt_args[] = {
          { "sched", "wakeup", 0, 0, "kthread_t *", "lwpsinfo_t *" },
--- 96,125 ----
  { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
  { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
  };
  
  sdt_provider_t sdt_providers[] = {
!         { "vtrace", "__vtrace_", &vtrace_attr },
!         { "sysinfo", "__cpu_sysinfo_", &info_attr, DTRACE_PRIV_USER },
!         { "vminfo", "__cpu_vminfo_", &info_attr, DTRACE_PRIV_USER },
!         { "fpuinfo", "__fpuinfo_", &fpu_attr },
!         { "sched", "__sched_", &stab_attr, DTRACE_PRIV_USER },
!         { "proc", "__proc_", &stab_attr, DTRACE_PRIV_USER },
!         { "io", "__io_", &stab_attr },
!         { "ip", "__ip_", &stab_attr },
!         { "tcp", "__tcp_", &stab_attr },
!         { "udp", "__udp_", &stab_attr },
!         { "mib", "__mib_", &stab_attr },
!         { "fsinfo", "__fsinfo_", &fsinfo_attr },
!         { "iscsi", "__iscsi_", &iscsi_attr },
!         { "nfsv3", "__nfsv3_", &stab_attr },
!         { "nfsv4", "__nfsv4_", &stab_attr },
!         { "xpv", "__xpv_", &xpv_attr },
!         { "fc", "__fc_", &fc_attr },
!         { "srp", "__srp_", &fc_attr },
!         { "sysevent", "__sysevent_", &stab_attr },
!         { "sdt", NULL, &sdt_attr },
          { NULL }
  };
  
  sdt_argdesc_t sdt_args[] = {
          { "sched", "wakeup", 0, 0, "kthread_t *", "lwpsinfo_t *" },
*** 1153,1162 ****
--- 1154,1177 ----
  
          { NULL }
  };
  
  /*ARGSUSED*/
+ int
+ sdt_mode(void *arg, dtrace_id_t id, void *parg)
+ {
+         /*
+          * We tell DTrace that we're in kernel mode, that the firing needs to
+          * be dropped for anything that doesn't have necessary privileges, and
+          * that it needs to be restricted for anything that has restricted
+          * (i.e., not all-zone) privileges.
+          */
+         return (DTRACE_MODE_KERNEL | DTRACE_MODE_NOPRIV_DROP |
+             DTRACE_MODE_LIMITEDPRIV_RESTRICT);
+ }
+ 
+ /*ARGSUSED*/
  void
  sdt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
  {
          sdt_probe_t *sdp = parg;
          int i;