Commit Graph

118 Commits

Author SHA1 Message Date
Rick Macklem
e2adc47dbb Add support for backchannels to the kernel RPC. Backchannels
are used by NFSv4.1 for callbacks. A backchannel is a connection
established by the client, but used for RPCs done by the server
on the client (callbacks). As a result, this patch mixes some
client side calls in the server side and vice versa. Some
definitions in the .c files were extracted out into a file called
krpc.h, so that they could be included in multiple .c files.
This code has been in projects/nfsv4.1-client for some time.
Although no one has given it a formal review, I believe kib@
has taken a look at it.
2012-12-08 00:29:16 +00:00
Gleb Smirnoff
eb1b1807af Mechanically substitute flags from historic mbuf allocator with
malloc(9) flags within sys.

Exceptions:

- sys/contrib not touched
- sys/mbuf.h edited manually
2012-12-05 08:04:20 +00:00
Rick Macklem
1e0706fdf7 Modify the comment to take out the names and URL.
Requested by:	kib
MFC after:	3 days
2012-10-25 19:30:58 +00:00
Rick Macklem
798a34fe09 Add a comment describing why r241097 was done.
Suggested by:	rwatson
MFC after:	1 week
2012-10-15 13:38:25 +00:00
Pedro F. Giffuni
0d1040e5e1 rpc: convert all uid and gid variables to u_int.
After further discussion, instead of pretending to use
uid_t and gid_t as upstream Solaris and linux try to, we
are better using u_int, which is in fact what the code
can handle and best approaches the range of values used
by uid and gid.

Discussed with:	bde
Reviewed by:	bde
2012-10-04 04:15:18 +00:00
Pedro F. Giffuni
0c2222baf4 libtirpc: be sure to free cl_netid and cl_tp
When creating a client with clnt_tli_create, it uses strdup to copy
strings for these fields if nconf is passed in. clnt_dg_destroy frees
these strings already. Make sure clnt_vc_destroy frees them in the same
way.

This change matches the reference (OpenSolaris) implementation.

Tested by:	David Wolfskill
Obtained from:	Bull GNU/Linux NFSv4 Project (libtirpc)
MFC after:	2 weeks
2012-10-02 19:10:19 +00:00
Pedro F. Giffuni
f3c3ef7b2a RPC: Convert all uid and gid variables of the type uid_t and gid_t.
This matches what upstream (OpenSolaris) does.

Tested by:	David Wolfskill
Obtained from:	Bull GNU/Linux NFSv4 project (libtirpc)
MFC after:	3 days
2012-10-02 19:00:56 +00:00
Rick Macklem
05496254a6 Attila Bogar and Herbert Poeckl both reported similar problems
w.r.t. a Linux NFS client doing a krb5 NFS mount against the
FreeBSD server. We determined this was a Linux bug:
http://www.spinics.net/lists/linux-nfs/msg32466.html, however
the mount failed to work, because the Destroy operation with a
bogus encrypted checksum destroyed the authenticator handle.
This patch changes the rpcsec_gss code so that it doesn't
Destroy the authenticator handle for this case and, as such,
the Linux mount will work.

Tested by: Attila Bogar and Herbert Poeckl
MFC after:	2 weeks
2012-10-01 12:28:58 +00:00
Pedro F. Giffuni
06f13fb3f4 Complete revert of r239963:
The attempt to merge changes from the linux libtirpc caused
rpc.lockd to exit after startup under unclear conditions.

After many hours of selective experiments and inconsistent results
the conclusion is that it's better to just revert everything and
restart in a future time with a much smaller subset of the
changes.
____

MFC after:	3 days
Reported by:	David Wolfskill
Tested by:	David Wolfskill
2012-09-27 19:10:25 +00:00
Pedro F. Giffuni
c148237d44 Partial revert of r239963:
The following change caused rpc.lockd to exit after startup:
____

libtirpc: be sure to free cl_netid and cl_tp

When creating a client with clnt_tli_create, it uses strdup to copy
strings for these fields if nconf is passed in. clnt_dg_destroy frees
these strings already. Make sure clnt_vc_destroy frees them in the
same way.
____

MFC after:	3 days
Reported by:	David Wolfskill
Tested by:	David Wolfskill
2012-09-24 03:14:17 +00:00
Pedro F. Giffuni
370c6ad8ce Fix RPC headers for C++
C++ mangling will cause trouble with variables like __rpc_xdr
in xdr.h so rename this to XDR.
While here add proper C++ guards to RPC headers.

PR:		137443
MFC after:	2 weeks
2012-09-02 21:04:40 +00:00
Pedro F. Giffuni
43981b6c53 Bring some changes from Bull's NFSv4 libtirpc implementation.
We especifically ignored the glibc compatibility changes
but this should help interaction with Solaris and Linux.
____

Fixed infinite loop in svc_run()
author	Steve Dickson
Tue, 10 Jun 2008 12:35:52 -0500 (13:35 -0400)
Fixed infinite loop in svc_run()
____

__rpc_taddr2uaddr_af() assumes the netbuf to always have a
non-zero data. This is a bad assumption and can lead to a
seg-fault. This patch adds a check for zero length and returns
NULL when found.
author	Steve Dickson
Mon, 27 Oct 2008 11:46:54 -0500 (12:46 -0400)
____

Changed clnt_spcreateerror() to return clearer
and more concise error messages.
author	Steve Dickson
Thu, 20 Nov 2008 08:55:31 -0500 (08:55 -0500)
____

Converted all uid and gid variables of the type uid_t and gid_t.
author	Steve Dickson
Wed, 28 Jan 2009 12:44:46 -0500 (12:44 -0500)
____

libtirpc: set r_netid and r_owner in __rpcb_findaddr_timed

These fields in the rpcbind GETADDR call are being passed uninitialized
to CLNT_CALL. In the case of x86_64 at least, this usually leads to a
segfault. On x86, it sometimes causes segfaults and other times causes
garbage to be sent on the wire.

rpcbind generally ignores the r_owner field for calls that come in over
the wire, so it really doesn't matter what we send in that slot. We just
need to send something. The reference implementation from Sun seems to
send a blank string. Have ours follow suit.
author	Jeff Layton
Fri, 13 Mar 2009 11:44:16 -0500 (12:44 -0400)
____

libtirpc: be sure to free cl_netid and cl_tp

When creating a client with clnt_tli_create, it uses strdup to copy
strings for these fields if nconf is passed in. clnt_dg_destroy frees
these strings already. Make sure clnt_vc_destroy frees them in the same
way.

author	Jeff Layton
Fri, 13 Mar 2009 11:47:36 -0500 (12:47 -0400)

Obtained from:	Bull GNU/Linux NFSv4 Project
MFC after:	3 weeks
2012-09-01 02:56:17 +00:00
Rick Macklem
2ba476324b Both a crash reported on freebsd-current on Oct. 18 under the
subject heading "mtx_lock() of destroyed mutex on NFS" and
PR# 156168 appear to be caused by clnt_dg_destroy() closing
down the socket prematurely. When to close down the socket
is controlled by a reference count (cs_refs), but clnt_dg_create()
checks for sb_upcall being non-NULL to decide if a new socket
is needed. I believe the crashes were caused by the following race:
  clnt_dg_destroy() finds cs_refs == 0 and decides to delete socket
  clnt_dg_destroy() then loses race with clnt_dg_create() for
    acquisition of the SOCKBUF_LOCK()
  clnt_dg_create() finds sb_upcall != NULL and increments cs_refs to 1
  clnt_dg_destroy() then acquires SOCKBUF_LOCK(), sets sb_upcall to
    NULL and destroys socket

This patch fixes the above race by changing clnt_dg_destroy() so
that it acquires SOCKBUF_LOCK() before testing cs_refs.

Tested by:	bz
PR:		156168
Reviewed by:	dfr
MFC after:	2 weeks
2011-11-03 14:38:03 +00:00
Rick Macklem
cbf06947eb Remove an extraneous "already" from a comment introduced by r226081.
Submitted by:	bf1783 at googlemail.com
MFC after:	3 days
2011-10-07 13:16:21 +00:00
Rick Macklem
5328a32e58 A crash reported on freebsd-fs@ on Sep. 23, 2011 under the subject
heading "kernel panics with RPCSEC_GSS" appears to be caused by a
corrupted tailq list for the client structure. Looking at the code, calls
to the function svc_rpc_gss_forget_client() were done in an SMP unsafe
manner, with the svc_rpc_gss_lock only being acquired in the function
and not before it. As such, when multiple threads called
svc_rpc_gss_forget_client() concurrently, it could try and remove the
same client structure from the tailq lists multiple times.
The patch fixes this by moving the critical code into a separate
function called svc_rpc_gss_forget_client_locked(), which must be
called with the lock held. For the one case where the caller would
have no interest in the lock, svc_rpc_gss_forget_client() was retained,
but a loop was added to check that the client structure is still in
the tailq lists before removing it, to make it safe for multiple
concurrent calls.

Tested by:	clinton.adams at gmail.com (earlier version)
Reviewed by:	zkirsch
MFC after:	3 days
2011-10-07 01:15:04 +00:00
Artem Belevich
fa3db771d2 Make sure RPC calls over UDP return RPC_INTR status is the process has
been interrupted in a restartable syscall. Otherwise we could end up
in an (almost) endless loop in clnt_reconnect_call().

PR: kern/160198
Reviewed by: rmacklem
Approved by: re (kib), avg (mentor)
MFC after: 1 week
2011-08-28 18:09:17 +00:00
Rick Macklem
7e7fd7d177 Fix the kgssapi so that it can be loaded as a module. Currently
the NFS subsystems use five of the rpcsec_gss/kgssapi entry points,
but since it was not obvious which others might be useful, all
nineteen were included. Basically the nineteen entry points are
set in a structure called rpc_gss_entries and inline functions
defined in sys/rpc/rpcsec_gss.h check for the entry points being
non-NULL and then call them. A default value is returned otherwise.
Requested by rwatson.

Reviewed by:	jhb
MFC after:	2 weeks
2011-06-19 22:08:55 +00:00
Rick Macklem
7b67bd9f3d This patch is believed to fix a problem in the kernel rpc for
non-interruptible NFS mounts, where a kernel thread will seem
to be stuck sleeping on "rpccon". The msleep() in clnt_vc_create()
that was waiting to a TCP connect to complete would return ERESTART,
since PCATCH was specified. Then the tsleep() in clnt_reconnect_call()
would sleep for 1 second and then try again and again and...
The patch changes the msleep() in clnt_vc_create() so it only sets
the PCATCH flag for interruptible cases.

Tested by:	pho
Reviewed by:	jhb
MFC after:	2 weeks
2011-04-27 18:19:26 +00:00
Rick Macklem
5e8eb3cd4e Fix a couple of mbuf leaks introduced by r217242. I do
not believe that these leaks had a practical impact,
since the situations in which they would have occurred
would have been extremely rare.

MFC after:	2 weeks
2011-04-13 00:03:49 +00:00
Bjoern A. Zeeb
1fb51a12f2 Mfp4 CH=177274,177280,177284-177285,177297,177324-177325
VNET socket push back:
  try to minimize the number of places where we have to switch vnets
  and narrow down the time we stay switched.  Add assertions to the
  socket code to catch possibly unset vnets as seen in r204147.

  While this reduces the number of vnet recursion in some places like
  NFS, POSIX local sockets and some netgraph, .. recursions are
  impossible to fix.

  The current expectations are documented at the beginning of
  uipc_socket.c along with the other information there.

  Sponsored by: The FreeBSD Foundation
  Sponsored by: CK Software GmbH
  Reviewed by:  jhb
  Tested by:    zec

Tested by:	Mikolaj Golub (to.my.trociny gmail.com)
MFC after:	2 weeks
2011-02-16 21:29:13 +00:00
Matthew D Fleming
fbbb13f962 sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly.
Commit the kernel changes.
2011-01-12 19:54:19 +00:00
Rick Macklem
2a1e0fb436 Fix a bug in the client side krpc where it was, sometimes
erroneously, assumed that 4 bytes of data were in the first
mbuf of a list by replacing the bcopy() with m_copydata().
Also, replace the uses of m_pullup(), which can fail for
reasons other than not enough data, with m_copydata().
For the cases where it isn't known that there is enough
data in the mbuf list, check first via m_len and m_length().
This is believed to fix a problem reported by dpd at dpdtech.com
and george+freebsd at m5p.com.

Reviewed by:	jhb
MFC after:	8 days
2011-01-10 21:35:10 +00:00
Rick Macklem
cec077bc8f Fix the krpc so that it can handle NFSv3,UDP mounts with a read/write
data size greater than 8192. Since soreserve(so, 256*1024, 256*1024)
would always fail for the default value of sb_max, modify clnt_dg.c
so that it uses the calculated values and checks for an error return
from soreserve(). Also, add a check for error return from soreserve()
to clnt_vc.c and change __rpc_get_t_size() to use sb_max_adj instead of
the bogus maxsize == 256*1024.

PR:		kern/150910
Reviewed by:	jhb
MFC after:	2 weeks
2010-10-13 00:57:14 +00:00
Attilio Rao
109c1de8ba Make the RPC specific __rpc_inet_ntop() and __rpc_inet_pton() general
in the kernel (just as inet_ntoa() and inet_aton()) are and sync their
prototype accordingly with already mentioned functions.

Sponsored by:	Sandvine Incorporated
Reviewed by:	emaste, rstone
Approved by:	dfr
MFC after:	2 weeks
2010-09-24 15:01:45 +00:00
Ed Maste
d370b81fd9 Remove unnecessary weak reference that was apparently copied from the
version of this function in lib/libc/inet/inet_pton.c

MFC after:     1 week
2010-09-23 17:47:46 +00:00
Pawel Jakub Dawidek
0778b1d117 - Check the result of malloc(M_NOWAIT) in replay_alloc(). The caller
(replay_alloc()) knows how to handle replay_alloc() failure.
- Eliminate 'freed_one' variable, it is not needed - when no entry is found
  rce will be NULL.
- Add locking assertions where we expect a rc_lock to be held.

Reviewed by:	rmacklem
MFC after:	2 weeks
2010-08-26 23:33:04 +00:00
Rick Macklem
d7dc2db434 Add mutex locking for the call to replay_prune() in
replay_setsize(), since replay_prune() expects the
rc_lock to be held when it is called.

MFC after:	2 weeks
2010-08-25 23:23:00 +00:00
Rick Macklem
12731c317d If the first iteration of the do loop in replay_prune()
succeeded and a subsequent interation failed to find an
entry to prune, it could loop infinitely, since the
"freed" variable wasn't reset to FALSE. This patch moves
setting freed FALSE to inside the loop to fix the problem.

Tested by:	alan.bryan at yahoo.com
MFC after:	2 weeks
2010-08-25 00:35:58 +00:00
Rick Macklem
578e600c8d When the regular NFS server replied to a UDP client out of the replay
cache, it did not free the request argument mbuf list, resulting in a leak.
This patch fixes that leak.

Tested by:	danny AT cs.huji.ac.il
PR:		kern/144330
Submitted by:	to.my.trociny AT gmail.com (earlier version)
Reviewed by:	dfr
MFC after:	2 weeks
2010-03-23 23:03:30 +00:00
Brooks Davis
412f9500e2 Replace the static NGROUPS=NGROUPS_MAX+1=1024 with a dynamic
kern.ngroups+1.  kern.ngroups can range from NGROUPS_MAX=1023 to
INT_MAX-1.  Given that the Windows group limit is 1024, this range
should be sufficient for most applications.

MFC after:	1 month
2010-01-12 07:49:34 +00:00
Brooks Davis
3d26cd60bf Make options KGSSAPI build and add it to NOTES.
rpcsec_gss_prot.c:
  Use kernel printf and headers.

vc_rpcsec_gss.c:
  Use a local RPCAUTH_UNIXGIDS definition for 16 instead of using NGROUPS.
2010-01-08 23:26:10 +00:00
Martin Blapp
c2ede4b379 Remove extraneous semicolons, no functional changes.
Submitted by:	Marc Balmer <marc@msys.ch>
MFC after:	1 week
2010-01-07 21:01:37 +00:00
Antoine Brodin
13e403fdea (S)LIST_HEAD_INITIALIZER takes a (S)LIST_HEAD as an argument.
Fix some wrong usages.
Note: this does not affect generated binaries as this argument is not used.

PR:		137213
Submitted by:	Eygene Ryabinkin (initial version)
MFC after:	1 month
2009-12-28 22:56:30 +00:00
Rick Macklem
f991753321 Add a check for the connection being shut down to the krpc
client just before queuing a request for the connection. The
code already had a check for the connection being shut down
while the request was queued, but not one for the shut down
having been initiated by the server before the request was
in the queue. This appears to fix the problem of slow reconnects
against an NFS server that drops inactive connections reported
by Olaf Seibert, but does not fix the case
where the FreeBSD client generates RST segments at about the
same time as ACKs. This is still a problem that is being
investigated. This patch does not cause a regression for this
case.

Tested by:	Olaf Seibert, Daniel Braniss
Reviewed by:	dfr
MFC after:	5 days
2009-11-08 19:02:13 +00:00
Jamie Gritton
c408f06b5e Set the prison in NFS anon and GSS SVC creds (as I indended to in r197581).
Reviewed by:	marcel
2009-09-28 18:55:29 +00:00
Jamie Gritton
2e92ac56dd Back out r197581, which replaced this file witk sys/kern/vfs_export.c.
Who knew that "svn export" was an actual command, or that I would have
vfs_export.c stuck in my mind deep enough to type "export" instead of
"commit"?

Pointy Hat to:  jamie
2009-09-28 18:54:26 +00:00
Jamie Gritton
d446857747 Set the prison in NFS anon and GSS SVC creds.
Reviewed by:	marcel
MFC after:	3 days
2009-09-28 18:07:16 +00:00
Marko Zec
0348c661d1 Fix NFS panics with options VIMAGE kernels by apropriately setting curvnet
context inside the RPC code.

Temporarily set td's cred to mount's cred before calling socreate() via
__rpc_nconf2socket().

Submitted by:	rmacklem (in part)
Reviewed by:	rmacklem, rwatson
Discussed with:	dfr, bz
Approved by:	re (rwatson), julian (mentor)
MFC after:	3 days
2009-08-24 10:09:30 +00:00
Konstantin Belousov
b35687df13 Use PBDRY flag for msleep(9) in NFS and NLM when sleeping thread owns
kernel resources that block other threads, like vnode locks. The SIGSTOP
sent to such thread (process, rather) shall not stop it until thread
releases the resources.

Tested by:	pho
Reviewed by:	jhb
Approved by:	re (kensmith)
2009-07-14 22:54:29 +00:00
Rick Macklem
a4c5a1c315 When unmounting an NFS mount using sec=krb5[ip], the umount system
call could get hung sleeping on "gsssta" if the credentials for a user
that had been accessing the mount point have expired. This happened
because rpc_gss_destroy_context() would end up calling itself when the
"destroy context" RPC was attempted, trying to refresh the credentials.
This patch just checks for this case in rpc_gss_refresh() and returns
without attempting the refresh, which avoids the recursive call to
rpc_gss_destroy_context() and the subsequent hang.

Reviewed by:	dfr
Approved by:	re (Ken Smith), kib (mentor)
2009-07-01 16:42:03 +00:00
Rick Macklem
b766fabd9c Make sure that cr_error is set to ESHUTDOWN when closing the connection.
This is normally done by a loop in clnt_dg_close(), but requests that aren't
in the pending queue at the time of closing, don't get set. This avoids a
panic in xdrmbuf_create() when it is called with a NULL cr_mrep if
cr_error doesn't get set to ESHUTDOWN while closing.

Reviewed by:	dfr
Approved by:	re (Ken Smith), kib (mentor)
2009-07-01 16:38:18 +00:00
Rick Macklem
72263475c4 Fix two known problems in clnt_rc.c, plus issues w.r.t. smp noted
during reading of the code. Change the code so that it never accesses
rc_connecting, rc_closed or rc_client when the rc_lock mutex is not held.
Also, it now performs the CLNT_CLOSE(client) and CLNT_RELEASE(client)
calls after the rc_lock mutex has been released, since those calls do
msleep()s with another mutex held. Change clnt_reconnect_call() so that
releasing the reference count is delayed until after the
"if (rc->rc_client == client)" check, so that rc_client cannot have been
recycled.

Tested by:	pho
Reviewed by:	dfr
Approved by:	kib (mentor)
2009-06-25 00:28:43 +00:00
Rick Macklem
b211588596 If the initial attempt to refresh credentials in the RPCSEC_GSS client
side fails, the entry in the cache is left with no valid context
(gd_ctx == GSS_C_NO_CONTEXT). As such, subsequent hits on the cache
will result in persistent authentication failure, even after the user has
done a kinit or similar and acquired a new valid TGT. This patch adds a test
for that case upon a cache hit and calls rpc_gss_init() to make another
attempt at getting valid credentials. It also moves the setting of gc_proc
to before the import of the principal name to ensure that, if that case
fails, it will be detected as a failure after going to "out:".

Reviewed by:	dfr
Approved by:	kib (mentor)
2009-06-24 18:30:14 +00:00
Rick Macklem
73c8b6d377 Delete the declaration of an unused variable so that it will build.
Approved by:	rwatson (mentor)
2009-06-20 17:16:29 +00:00
Brooks Davis
838d985825 Rework the credential code to support larger values of NGROUPS and
NGROUPS_MAX, eliminate ABI dependencies on them, and raise the to 1024
and 1023 respectively.  (Previously they were equal, but under a close
reading of POSIX, NGROUPS_MAX was defined to be too large by 1 since it
is the number of supplemental groups, not total number of groups.)

The bulk of the change consists of converting the struct ucred member
cr_groups from a static array to a pointer.  Do the equivalent in
kinfo_proc.

Introduce new interfaces crcopysafe() and crsetgroups() for duplicating
a process credential before modifying it and for setting group lists
respectively.  Both interfaces take care for the details of allocating
groups array. crsetgroups() takes care of truncating the group list
to the current maximum (NGROUPS) if necessary.  In the future,
crsetgroups() may be responsible for insuring invariants such as sorting
the supplemental groups to allow groupmember() to be implemented as a
binary search.

Because we can not change struct xucred without breaking application
ABIs, we leave it alone and introduce a new XU_NGROUPS value which is
always 16 and is to be used or NGRPS as appropriate for things such as
NFS which need to use no more than 16 groups.  When feasible, truncate
the group list rather than generating an error.

Minor changes:
  - Reduce the number of hand rolled versions of groupmember().
  - Do not assign to both cr_gid and cr_groups[0].
  - Modify ipfw to cache ucreds instead of part of their contents since
    they are immutable once referenced by more than one entity.

Submitted by:	Isilon Systems (initial implementation)
X-MFC after:	never
PR:		bin/113398 kern/133867
2009-06-19 17:10:35 +00:00
Rick Macklem
6b97c9f09a Since svc_[dg|vc|tli|tp]_create() did not hold a reference count on the
SVCXPTR structure returned by them, it was possible for the structure
to be free'd before svc_reg() had been completed using the structure.
This patch acquires a reference count on the newly created structure
that is returned by svc_[dg|vc|tli|tp]_create(). It also
adds the appropriate SVC_RELEASE() calls to the callers, except the
experimental nfs subsystem. The latter will be committed separately.

Submitted by:	dfr
Tested by:	pho
Approved by:	kib (mentor)
2009-06-17 22:50:26 +00:00
Rick Macklem
ae883d554a Replace the global references to "hostid" in svc_rpcsec_gss.c to local
variables set via the getcredhostid() function. I also changed the type
of ci_hostid to "unsigned long" so that it matches what is returned by
getcredhostid(). Although "struct svc_rpc_gss_clientid" goes on the wire
during RPCSEC_GSS, it is just a variable # of opaque bytes to the client,
so it doesn't matter how much storage ci_hostid uses.

Approved by:	kib (mentor)
2009-06-15 14:44:55 +00:00
Rick Macklem
aae53bae73 When a Solaris10 client does an NFS mount using krb5i or krb5p, the
server would crash because the Solaris10 client would attempt to use
Sun's NFSACL protocol, which FreeBSD doesn't support. When the server
generated the error reply via svcerr_noprog(), it would cause a crash
because it would try and wrap a NULL reply. According to RFC2203, no
wrapping is required for error cases. This one line change avoids
wrapping of NULL replies.

Reviewed by:	dfr
Approved by:	kib (mentor)
2009-06-13 23:16:40 +00:00
Rick Macklem
dce35fe0ff For the case where another thread was doing a connect and that
connect failed, the thread would be left stuck in msleep()
indefinitely, since it would call msleep() again for the case
where rc_client == NULL. Change the loop criteria and the if just
after the loop, so that this case is handled correctly.

Reviewed by:	dfr
Approved by:	kib (mentor)
2009-06-10 19:02:09 +00:00
Robert Watson
dab07fbcef Add a temporary workaround for panics being seen on NFS servers with ZFS,
where an improperly initialized prison field could lead to a panic.  This
is not the correct solution, since it fails to address similar problems
for both AUDIT and MAC, which also rely on properly initialized
credentials, but should reduce panic reports while we work that out.

Reported by:	ps, kan, others
2009-06-07 20:51:31 +00:00