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On Mon, 15 Feb 2016, Trond Myklebust wrote:
> Hi Scott,
>
> On Mon, Feb 15, 2016 at 2:28 PM, Scott Mayhew <smayhew@redhat.com> wrote:
> > md5 is disabled in fips mode, and attempting to import a gss context
> > using md5 while in fips mode will result in crypto_alg_mod_lookup()
> > returning -ENOENT, which will make its way back up to
> > gss_pipe_downcall(), where the BUG() is triggered. Handling the -ENOENT
> > allows for a more graceful failure.
> >
> > Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> > ---
> > net/sunrpc/auth_gss/auth_gss.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
> > index 799e65b..c30fc3b 100644
> > --- a/net/sunrpc/auth_gss/auth_gss.c
> > +++ b/net/sunrpc/auth_gss/auth_gss.c
> > @@ -737,6 +737,9 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
> > case -ENOSYS:
> > gss_msg->msg.errno = -EAGAIN;
> > break;
> > + case -ENOENT:
> > + gss_msg->msg.errno = -EPROTONOSUPPORT;
> > + break;
> > default:
> > printk(KERN_CRIT "%s: bad return from "
> > "gss_fill_context: %zd\n", __func__, err);
> > --
> > 2.4.3
> >
>
> Well debugged, but I unfortunately do have to ask if this patch is
> sufficient? In addition to -ENOENT, and -ENOMEM, it looks to me as if
> crypto_alg_mod_lookup() can also fail with -EINTR, -ETIMEDOUT, and
> -EAGAIN. Don't we also want to handle those?
You're right, I was focusing on the panic that I could easily reproduce.
I'm still not sure how I could trigger those other conditions.
>
> In fact, peering into the rats nest that is
> gss_import_sec_context_kerberos(), it looks as if that is just a tiny
> subset of all the errors that we might run into. Perhaps the right
> thing to do here is to get rid of the BUG() (but keep the above
> printk) and just return a generic error?
That sounds fine to me -- updated patch attached.
-Scott
>From d54c6b64a107a90a38cab97577de05f9a4625052 Mon Sep 17 00:00:00 2001
From: Scott Mayhew <smayhew@redhat.com>
Date: Mon, 15 Feb 2016 15:12:19 -0500
Subject: [PATCH] auth_gss: remove the BUG() from gss_pipe_downcall()
Instead return a generic error via gss_msg->msg.errno. None of the
errors returned by gss_fill_context() should necessarily trigger a
kernel panic.
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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This is a pre-patch for the RPC multipath code. It sets up the storage in
struct rpc_clnt for the multipath code.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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This patch replaces uses of blkcipher with skcipher and the long
obsolete hash interface with either shash (for non-SG users) and
ahash.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The principal name on a gss cred is used to setup the NFSv4.0 callback,
which has to have a client principal name to authenticate to.
That code wants the name to be in the form servicetype@hostname.
rpc.svcgssd passes down such names (and passes down no principal name at
all in the case the principal isn't a service principal).
gss-proxy always passes down the principal name, and passes it down in
the form servicetype/hostname@REALM. So we've been munging the name
gss-proxy passes down into the format the NFSv4.0 callback code expects,
or throwing away the name if we can't.
Since the introduction of the MACH_CRED enforcement in NFSv4.1, we've
also been using the principal name to verify that certain operations are
done as the same principal as was used on the original EXCHANGE_ID call.
For that application, the original name passed down by gss-proxy is also
useful.
Lack of that name in some cases was causing some kerberized NFSv4.1
mount failures in an Active Directory environment.
This fix only works in the gss-proxy case. The fix for legacy
rpc.svcgssd would be more involved, and rpc.svcgssd already has other
problems in the AD case.
Reported-and-tested-by: James Ralston <ralston@pobox.com>
Acked-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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The gss_key_timeout() function causes a harmless warning in some
configurations, e.g. ARM imx_v6_v7_defconfig with gcc-5.2, if the
compiler cannot figure out the state of the 'expire' variable across
an rcu_read_unlock():
net/sunrpc/auth_gss/auth_gss.c: In function 'gss_key_timeout':
net/sunrpc/auth_gss/auth_gss.c:1422:211: warning: 'expire' may be used uninitialized in this function [-Wmaybe-uninitialized]
To avoid this warning without adding a bogus initialization, this
rewrites the function so the comparison is done inside of the
critical section. As a side-effect, it also becomes slightly
easier to understand because the implementation now more closely
resembles the comment above it.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: c5e6aecd034e7 ("sunrpc: fix RCU handling of gc_ctx field")
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Don't opencode sg_init_one()
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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In an environment where the KDC is running Active Directory, the
exported composite name field returned in the context could be large
enough to span a page boundary. Attaching a scratch buffer to the
decoding xdr_stream helps deal with those cases.
The case where we saw this was actually due to behavior that's been
fixed in newer gss-proxy versions, but we're fixing it here too.
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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If we call groups_alloc() with invalid values then it's might lead to
memory corruption. For example, with a negative value then we might not
allocate enough for sizeof(struct group_info).
(We're doing this in the caller for consistency with other callers of
groups_alloc(). The other alternative might be to move the check out of
all the callers into groups_alloc().)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Our UC-KLEE tool found a kernel memory leak of 512 bytes (on x86_64) for
each call to gssp_accept_sec_context_upcall()
(net/sunrpc/auth_gss/gss_rpc_upcall.c). Since it appears that this call
can be triggered by remote connections (at least, from a cursory a
glance at the call chain), it may be exploitable to cause kernel memory
exhaustion. We found the bug in kernel 3.16.3, but it appears to date
back to commit 9dfd87da1aeb0fd364167ad199f40fe96a6a87be (2013-08-20).
The gssp_accept_sec_context_upcall() function performs a pair of calls
to gssp_alloc_receive_pages() and gssp_free_receive_pages(). The first
allocates memory for arg->pages. The second then frees the pages
pointed to by the arg->pages array, but not the array itself.
Reported-by: David A. Ramos <daramos@stanford.edu>
Fixes: 9dfd87da1aeb ("rpc: fix huge kmalloc's in gss-proxy”)
Signed-off-by: David A. Ramos <daramos@stanford.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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It's always set to whatever CONFIG_SUNRPC_DEBUG is, so just use that.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Bruce reported that he was seeing the following BUG pop:
BUG: sleeping function called from invalid context at mm/slab.c:2846
in_atomic(): 0, irqs_disabled(): 0, pid: 4539, name: mount.nfs
2 locks held by mount.nfs/4539:
#0: (nfs_clid_init_mutex){+.+.+.}, at: [<ffffffffa01c0a9a>] nfs4_discover_server_trunking+0x4a/0x2f0 [nfsv4]
#1: (rcu_read_lock){......}, at: [<ffffffffa00e3185>] gss_stringify_acceptor+0x5/0xb0 [auth_rpcgss]
Preemption disabled at:[<ffffffff81a4f082>] printk+0x4d/0x4f
CPU: 3 PID: 4539 Comm: mount.nfs Not tainted 3.18.0-rc1-00013-g5b095e9 #3393
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
ffff880021499390 ffff8800381476a8 ffffffff81a534cf 0000000000000001
0000000000000000 ffff8800381476c8 ffffffff81097854 00000000000000d0
0000000000000018 ffff880038147718 ffffffff8118e4f3 0000000020479f00
Call Trace:
[<ffffffff81a534cf>] dump_stack+0x4f/0x7c
[<ffffffff81097854>] __might_sleep+0x114/0x180
[<ffffffff8118e4f3>] __kmalloc+0x1a3/0x280
[<ffffffffa00e31d8>] gss_stringify_acceptor+0x58/0xb0 [auth_rpcgss]
[<ffffffffa00e3185>] ? gss_stringify_acceptor+0x5/0xb0 [auth_rpcgss]
[<ffffffffa006b438>] rpcauth_stringify_acceptor+0x18/0x30 [sunrpc]
[<ffffffffa01b0469>] nfs4_proc_setclientid+0x199/0x380 [nfsv4]
[<ffffffffa01b04d0>] ? nfs4_proc_setclientid+0x200/0x380 [nfsv4]
[<ffffffffa01bdf1a>] nfs40_discover_server_trunking+0xda/0x150 [nfsv4]
[<ffffffffa01bde45>] ? nfs40_discover_server_trunking+0x5/0x150 [nfsv4]
[<ffffffffa01c0acf>] nfs4_discover_server_trunking+0x7f/0x2f0 [nfsv4]
[<ffffffffa01c8e24>] nfs4_init_client+0x104/0x2f0 [nfsv4]
[<ffffffffa01539b4>] nfs_get_client+0x314/0x3f0 [nfs]
[<ffffffffa0153780>] ? nfs_get_client+0xe0/0x3f0 [nfs]
[<ffffffffa01c83aa>] nfs4_set_client+0x8a/0x110 [nfsv4]
[<ffffffffa0069708>] ? __rpc_init_priority_wait_queue+0xa8/0xf0 [sunrpc]
[<ffffffffa01c9b2f>] nfs4_create_server+0x12f/0x390 [nfsv4]
[<ffffffffa01c1472>] nfs4_remote_mount+0x32/0x60 [nfsv4]
[<ffffffff81196489>] mount_fs+0x39/0x1b0
[<ffffffff81166145>] ? __alloc_percpu+0x15/0x20
[<ffffffff811b276b>] vfs_kern_mount+0x6b/0x150
[<ffffffffa01c1396>] nfs_do_root_mount+0x86/0xc0 [nfsv4]
[<ffffffffa01c1784>] nfs4_try_mount+0x44/0xc0 [nfsv4]
[<ffffffffa01549b7>] ? get_nfs_version+0x27/0x90 [nfs]
[<ffffffffa0161a2d>] nfs_fs_mount+0x47d/0xd60 [nfs]
[<ffffffff81a59c5e>] ? mutex_unlock+0xe/0x10
[<ffffffffa01606a0>] ? nfs_remount+0x430/0x430 [nfs]
[<ffffffffa01609c0>] ? nfs_clone_super+0x140/0x140 [nfs]
[<ffffffff81196489>] mount_fs+0x39/0x1b0
[<ffffffff81166145>] ? __alloc_percpu+0x15/0x20
[<ffffffff811b276b>] vfs_kern_mount+0x6b/0x150
[<ffffffff811b5830>] do_mount+0x210/0xbe0
[<ffffffff811b54ca>] ? copy_mount_options+0x3a/0x160
[<ffffffff811b651f>] SyS_mount+0x6f/0xb0
[<ffffffff81a5c852>] system_call_fastpath+0x12/0x17
Sleeping under the rcu_read_lock is bad. This patch fixes it by dropping
the rcu_read_lock before doing the allocation and then reacquiring it
and redoing the dereference before doing the copy. If we find that the
string has somehow grown in the meantime, we'll reallocate and try again.
Cc: <stable@vger.kernel.org> # v3.17+
Reported-by: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Pull NFS client updates from Trond Myklebust:
"Highlights include:
- stable fix for a bug in nfs3_list_one_acl()
- speed up NFS path walks by supporting LOOKUP_RCU
- more read/write code cleanups
- pNFS fixes for layout return on close
- fixes for the RCU handling in the rpcsec_gss code
- more NFS/RDMA fixes"
* tag 'nfs-for-3.17-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (79 commits)
nfs: reject changes to resvport and sharecache during remount
NFS: Avoid infinite loop when RELEASE_LOCKOWNER getting expired error
SUNRPC: remove all refcounting of groupinfo from rpcauth_lookupcred
NFS: fix two problems in lookup_revalidate in RCU-walk
NFS: allow lockless access to access_cache
NFS: teach nfs_lookup_verify_inode to handle LOOKUP_RCU
NFS: teach nfs_neg_need_reval to understand LOOKUP_RCU
NFS: support RCU_WALK in nfs_permission()
sunrpc/auth: allow lockless (rcu) lookup of credential cache.
NFS: prepare for RCU-walk support but pushing tests later in code.
NFS: nfs4_lookup_revalidate: only evaluate parent if it will be used.
NFS: add checks for returned value of try_module_get()
nfs: clear_request_commit while holding i_lock
pnfs: add pnfs_put_lseg_async
pnfs: find swapped pages on pnfs commit lists too
nfs: fix comment and add warn_on for PG_INODE_REF
nfs: check wait_on_bit_lock err in page_group_lock
sunrpc: remove "ec" argument from encrypt_v2 operation
sunrpc: clean up sparse endianness warnings in gss_krb5_wrap.c
sunrpc: clean up sparse endianness warnings in gss_krb5_seal.c
...
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It's always 0.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Fix the endianness handling in gss_wrap_kerberos_v1 and drop the memset
call there in favor of setting the filler bytes directly.
In gss_wrap_kerberos_v2, get rid of the "ec" variable which is always
zero, and drop the endianness conversion of 0. Sparse handles 0 as a
special case, so it's not necessary.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Use u16 pointer in setup_token and setup_token_v2. None of the fields
are actually handled as __be16, so this simplifies the code a bit. Also
get rid of some unneeded pointer increments.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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The handling of the gc_ctx pointer only seems to be partially RCU-safe.
The assignment and freeing are done using RCU, but many places in the
code seem to dereference that pointer without proper RCU safeguards.
Fix them to use rcu_dereference and to rcu_read_lock/unlock, and to
properly handle the case where the pointer is NULL.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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...and add an new rpc_auth function to call it when it exists. This
is only applicable for AUTH_GSS mechanisms, so we only specify this
for those sorts of credentials.
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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If rpc.gssd sends us an acceptor name string trailing the context token,
stash it as part of the context.
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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rq_usedeferral and rq_splice_ok are used as 0 and 1, just defined to bool.
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Pull NFS client updates from Trond Myklebust:
"Highlights include:
- massive cleanup of the NFS read/write code by Anna and Dros
- support multiple NFS read/write requests per page in order to deal
with non-page aligned pNFS striping. Also cleans up the r/wsize <
page size code nicely.
- stable fix for ensuring inode is declared uptodate only after all
the attributes have been checked.
- stable fix for a kernel Oops when remounting
- NFS over RDMA client fixes
- move the pNFS files layout driver into its own subdirectory"
* tag 'nfs-for-3.16-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (79 commits)
NFS: populate ->net in mount data when remounting
pnfs: fix lockup caused by pnfs_generic_pg_test
NFSv4.1: Fix typo in dprintk
NFSv4.1: Comment is now wrong and redundant to code
NFS: Use raw_write_seqcount_begin/end int nfs4_reclaim_open_state
xprtrdma: Disconnect on registration failure
xprtrdma: Remove BUG_ON() call sites
xprtrdma: Avoid deadlock when credit window is reset
SUNRPC: Move congestion window constants to header file
xprtrdma: Reset connection timeout after successful reconnect
xprtrdma: Use macros for reconnection timeout constants
xprtrdma: Allocate missing pagelist
xprtrdma: Remove Tavor MTU setting
xprtrdma: Ensure ia->ri_id->qp is not NULL when reconnecting
xprtrdma: Reduce the number of hardway buffer allocations
xprtrdma: Limit work done by completion handler
xprtrmda: Reduce calls to ib_poll_cq() in completion handlers
xprtrmda: Reduce lock contention in completion handlers
xprtrdma: Split the completion queue
xprtrdma: Make rpcrdma_ep_destroy() return void
...
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Pull nfsd updates from Bruce Fields:
"The largest piece is a long-overdue rewrite of the xdr code to remove
some annoying limitations: for example, there was no way to return
ACLs larger than 4K, and readdir results were returned only in 4k
chunks, limiting performance on large directories.
Also:
- part of Neil Brown's work to make NFS work reliably over the
loopback interface (so client and server can run on the same
machine without deadlocks). The rest of it is coming through
other trees.
- cleanup and bugfixes for some of the server RDMA code, from
Steve Wise.
- Various cleanup of NFSv4 state code in preparation for an
overhaul of the locking, from Jeff, Trond, and Benny.
- smaller bugfixes and cleanup from Christoph Hellwig and
Kinglong Mee.
Thanks to everyone!
This summer looks likely to be busier than usual for knfsd. Hopefully
we won't break it too badly; testing definitely welcomed"
* 'for-3.16' of git://linux-nfs.org/~bfields/linux: (100 commits)
nfsd4: fix FREE_STATEID lockowner leak
svcrdma: Fence LOCAL_INV work requests
svcrdma: refactor marshalling logic
nfsd: don't halt scanning the DRC LRU list when there's an RC_INPROG entry
nfs4: remove unused CHANGE_SECURITY_LABEL
nfsd4: kill READ64
nfsd4: kill READ32
nfsd4: simplify server xdr->next_page use
nfsd4: hash deleg stateid only on successful nfs4_set_delegation
nfsd4: rename recall_lock to state_lock
nfsd: remove unneeded zeroing of fields in nfsd4_proc_compound
nfsd: fix setting of NFS4_OO_CONFIRMED in nfsd4_open
nfsd4: use recall_lock for delegation hashing
nfsd: fix laundromat next-run-time calculation
nfsd: make nfsd4_encode_fattr static
SUNRPC/NFSD: Remove using of dprintk with KERN_WARNING
nfsd: remove unused function nfsd_read_file
nfsd: getattr for FATTR4_WORD0_FILES_AVAIL needs the statfs buffer
NFSD: Error out when getting more than one fsloc/secinfo/uuid
NFSD: Using type of uint32_t for ex_nflavors instead of int
...
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RPC_MAX_AUTH_SIZE is scattered around several places. Better to set it
once in the auth code, where this kind of estimate should be made. And
while we're at it we can leave it zero when we're not using krb5i or
krb5p.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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We're not taking a reference in the case where _gss_mech_get_by_pseudoflavor
loops without finding the correct rpcsec_gss flavour, so why are we
releasing it?
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Mostly scripted conversion of the smp_mb__* barriers.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-55dhyhocezdw1dg7u19hmh1u@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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In gss_alloc_msg(), if the call to gss_encode_v1_msg() fails, we
want to release the reference to the pipe_version that was obtained
earlier in the function.
Fixes: 9d3a2260f0f4b (SUNRPC: Fix buffer overflow checking in...)
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Fix a race in which the RPC client is shutting down while the
gss daemon is processing a downcall. If the RPC client manages to
shut down before the gss daemon is done, then the struct gss_auth
used in gss_release_msg() may have already been freed.
Link: http://lkml.kernel.org/r/1392494917.71728.YahooMailNeo@web140002.mail.bf1.yahoo.com
Reported-by: John <da_audiophile@yahoo.com>
Reported-by: Borislav Petkov <bp@alien8.de>
Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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An infinite loop is caused when nfs4_establish_lease() fails
with -EACCES. This causes nfs4_handle_reclaim_lease_error()
to sleep a bit and resets the NFS4CLNT_LEASE_EXPIRED bit.
This in turn causes nfs4_state_manager() to try and
reestablished the lease, again, again, again...
The problem is a valid RPCSEC_GSS client is being created when
rpc.gssd is not running.
Link: http://lkml.kernel.org/r/1392066375-16502-1-git-send-email-steved@redhat.com
Fixes: 0ea9de0ea6a4 (sunrpc: turn warn_gssd() log message into a dprintk())
Reported-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Pull NFS client bugfixes from Trond Myklebust:
"Highlights:
- Fix several races in nfs_revalidate_mapping
- NFSv4.1 slot leakage in the pNFS files driver
- Stable fix for a slot leak in nfs40_sequence_done
- Don't reject NFSv4 servers that support ACLs with only ALLOW aces"
* tag 'nfs-for-3.14-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
nfs: initialize the ACL support bits to zero.
NFSv4.1: Cleanup
NFSv4.1: Clean up nfs41_sequence_done
NFSv4: Fix a slot leak in nfs40_sequence_done
NFSv4.1 free slot before resending I/O to MDS
nfs: add memory barriers around NFS_INO_INVALID_DATA and NFS_INO_INVALIDATING
NFS: Fix races in nfs_revalidate_mapping
sunrpc: turn warn_gssd() log message into a dprintk()
NFS: fix the handling of NFS_INO_INVALID_DATA flag in nfs_revalidate_mapping
nfs: handle servers that support only ALLOW ACE type.
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Pull nfsd updates from Bruce Fields:
- Handle some loose ends from the vfs read delegation support.
(For example nfsd can stop breaking leases on its own in a
fewer places where it can now depend on the vfs to.)
- Make life a little easier for NFSv4-only configurations
(thanks to Kinglong Mee).
- Fix some gss-proxy problems (thanks Jeff Layton).
- miscellaneous bug fixes and cleanup
* 'for-3.14' of git://linux-nfs.org/~bfields/linux: (38 commits)
nfsd: consider CLAIM_FH when handing out delegation
nfsd4: fix delegation-unlink/rename race
nfsd4: delay setting current_fh in open
nfsd4: minor nfs4_setlease cleanup
gss_krb5: use lcm from kernel lib
nfsd4: decrease nfsd4_encode_fattr stack usage
nfsd: fix encode_entryplus_baggage stack usage
nfsd4: simplify xdr encoding of nfsv4 names
nfsd4: encode_rdattr_error cleanup
nfsd4: nfsd4_encode_fattr cleanup
minor svcauth_gss.c cleanup
nfsd4: better VERIFY comment
nfsd4: break only delegations when appropriate
NFSD: Fix a memory leak in nfsd4_create_session
sunrpc: get rid of use_gssp_lock
sunrpc: fix potential race between setting use_gss_proxy and the upcall rpc_clnt
sunrpc: don't wait for write before allowing reads from use-gss-proxy file
nfsd: get rid of unused function definition
Define op_iattr for nfsd4_open instead using macro
NFSD: fix compile warning without CONFIG_NFSD_V3
...
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The original printk() made sense when the GSSAPI codepaths were called
only when sec=krb5* was explicitly requested. Now however, in many cases
the nfs client will try to acquire GSSAPI credentials by default, even
when it's not requested.
Since we don't have a great mechanism to distinguish between the two
cases, just turn the pr_warn into a dprintk instead. With this change we
can also get rid of the ratelimiting.
We do need to keep the EXPORT_SYMBOL(gssd_running) in place since
auth_gss.ko needs it and sunrpc.ko provides it. We can however,
eliminate the gssd_running call in the nfs code since that's a bit of a
layering violation.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Replace hardcoded lowest common multiple algorithm by the lcm()
function in kernel lib.
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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We can achieve the same result with a cmpxchg(). This also fixes a
potential race in use_gss_proxy(). The value of sn->use_gss_proxy could
go from -1 to 1 just after we check it in use_gss_proxy() but before we
acquire the spinlock. The procfile write would end up returning success
but the value would flip to 0 soon afterward. With this method we not
only avoid locking but the first "setter" always wins.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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An nfsd thread can call use_gss_proxy and find it set to '1' but find
gssp_clnt still NULL, so that when it attempts the upcall the result
will be an unnecessary -EIO.
So, ensure that gssp_clnt is created first, and set the use_gss_proxy
variable only if that succeeds.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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It doesn't make much sense to make reads from this procfile hang. As
far as I can tell, only gssproxy itself will open this file and it
never reads from it. Change it to just give the present setting of
sn->use_gss_proxy without waiting for anything.
Note that we do not want to call use_gss_proxy() in this codepath
since an inopportune read of this file could cause it to be disabled
prematurely.
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Now that we have a more reliable method to tell if gssd is running, we
can replace the sn->gssd_running flag with a function that will query to
see if it's up and running.
There's also no need to attempt an upcall that we know will fail, so
just return -EACCES if gssd isn't running. Finally, fix the warn_gss()
message not to claim that that the upcall timed out since we don't
necesarily perform one now when gssd isn't running, and remove the
extraneous newline from the message.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Pull NFS client bugfixes from Trond Myklebust:
- Stable fix for a NFSv4.1 delegation and state recovery deadlock
- Stable fix for a loop on irrecoverable errors when returning
delegations
- Fix a 3-way deadlock between layoutreturn, open, and state recovery
- Update the MAINTAINERS file with contact information for Trond
Myklebust
- Close needs to handle NFS4ERR_ADMIN_REVOKED
- Enabling v4.2 should not recompile nfsd and lockd
- Fix a couple of compile warnings
* tag 'nfs-for-3.13-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
nfs: fix do_div() warning by instead using sector_div()
MAINTAINERS: Update contact information for Trond Myklebust
NFSv4.1: Prevent a 3-way deadlock between layoutreturn, open and state recovery
SUNRPC: do not fail gss proc NULL calls with EACCES
NFSv4: close needs to handle NFS4ERR_ADMIN_REVOKED
NFSv4: Update list of irrecoverable errors on DELEGRETURN
NFSv4 wait on recovery for async session errors
NFS: Fix a warning in nfs_setsecurity
NFS: Enabling v4.2 should not recompile nfsd and lockd
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Otherwise RPCSEC_GSS_DESTROY messages are not sent.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Pull nfsd changes from Bruce Fields:
"This includes miscellaneous bugfixes and cleanup and a performance fix
for write-heavy NFSv4 workloads.
(The most significant nfsd-relevant change this time is actually in
the delegation patches that went through Viro, fixing a long-standing
bug that can cause NFSv4 clients to miss updates made by non-nfs users
of the filesystem. Those enable some followup nfsd patches which I
have queued locally, but those can wait till 3.14)"
* 'nfsd-next' of git://linux-nfs.org/~bfields/linux: (24 commits)
nfsd: export proper maximum file size to the client
nfsd4: improve write performance with better sendspace reservations
svcrpc: remove an unnecessary assignment
sunrpc: comment typo fix
Revert "nfsd: remove_stid can be incorporated into nfs4_put_delegation"
nfsd4: fix discarded security labels on setattr
NFSD: Add support for NFS v4.2 operation checking
nfsd4: nfsd_shutdown_net needs state lock
NFSD: Combine decode operations for v4 and v4.1
nfsd: -EINVAL on invalid anonuid/gid instead of silent failure
nfsd: return better errors to exportfs
nfsd: fh_update should error out in unexpected cases
nfsd4: need to destroy revoked delegations in destroy_client
nfsd: no need to unhash_stid before free
nfsd: remove_stid can be incorporated into nfs4_put_delegation
nfsd: nfs4_open_delegation needs to remove_stid rather than unhash_stid
nfsd: nfs4_free_stid
nfsd: fix Kconfig syntax
sunrpc: trim off EC bytes in GSSAPI v2 unwrap
gss_krb5: document that we ignore sequence number
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In gss_encode_v1_msg, it is pointless to BUG() after the overflow has
happened. Replace the existing sprintf()-based code with scnprintf(),
and warn if an overflow is ever triggered.
In gss_encode_v0_msg, replace the runtime BUG_ON() with an appropriate
compile-time BUILD_BUG_ON.
Reported-by: Bruce Fields <bfields@fieldses.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Add the missing 'break' to ensure that we don't corrupt a legacy 'v0' type
message by appending the 'v1'.
Cc: Bruce Fields <bfields@fieldses.org>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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As Bruce points out in RFC 4121, section 4.2.3:
"In Wrap tokens that provide for confidentiality, the first 16 octets
of the Wrap token (the "header", as defined in section 4.2.6), SHALL
be appended to the plaintext data before encryption. Filler octets
MAY be inserted between the plaintext data and the "header.""
...and...
"In Wrap tokens with confidentiality, the EC field SHALL be used to
encode the number of octets in the filler..."
It's possible for the client to stuff different data in that area on a
retransmission, which could make the checksum come out wrong in the DRC
code.
After decrypting the blob, we should trim off any extra count bytes in
addition to the checksum blob.
Reported-by: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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A couple times recently somebody has noticed that we're ignoring a
sequence number here and wondered whether there's a bug.
In fact, there's not. Thanks to Andy Adamson for pointing out a useful
explanation in rfc 2203. Add comments citing that rfc, and remove
"seqnum" to prevent static checkers complaining about unused variables.
Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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For every other problem here we bail out with an error, but here for
some reason we're setting a negative cache entry (with, note, an
undefined expiry).
It seems simplest just to bail out in the same way as we do in other
cases.
Cc: Simo Sorce <simo@redhat.com>
Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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We depend on the xdr decoder to set this pointer, but if we error out
before we decode this piece it could be left NULL.
I think this is probably tough to hit without a buggy gss-proxy.
Reported-by: Andi Kleen <andi@firstfloor.org>
Cc: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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This fixes a regression since eb6dc19d8e72ce3a957af5511d20c0db0a8bd007
"RPCSEC_GSS: Share all credential caches on a per-transport basis" which
could cause an occasional oops in the nfsd code (see below).
The problem was that an auth was left referencing a client that had been
freed. To avoid this we need to ensure that auths are shared only
between descendants of a common client; the fact that a clone of an
rpc_client takes a reference on its parent then ensures that the parent
client will last as long as the auth.
Also add a comment explaining what I think was the intention of this
code.
general protection fault: 0000 [#1] PREEMPT SMP
Modules linked in: rpcsec_gss_krb5 nfsd auth_rpcgss oid_registry nfs_acl lockd sunrpc
CPU: 3 PID: 4071 Comm: kworker/u8:2 Not tainted 3.11.0-rc2-00182-g025145f #1665
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
Workqueue: nfsd4_callbacks nfsd4_do_callback_rpc [nfsd]
task: ffff88003e206080 ti: ffff88003c384000 task.ti: ffff88003c384000
RIP: 0010:[<ffffffffa00001f3>] [<ffffffffa00001f3>] rpc_net_ns+0x53/0x70 [sunrpc]
RSP: 0000:ffff88003c385ab8 EFLAGS: 00010246
RAX: 6b6b6b6b6b6b6b6b RBX: ffff88003af9a800 RCX: 0000000000000002
RDX: ffffffffa00001a5 RSI: 0000000000000001 RDI: ffffffff81e284e0
RBP: ffff88003c385ad8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000015 R12: ffff88003c990840
R13: ffff88003c990878 R14: ffff88003c385ba8 R15: ffff88003e206080
FS: 0000000000000000(0000) GS:ffff88003fd80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007fcdf737e000 CR3: 000000003ad2b000 CR4: 00000000000006e0
Stack:
ffffffffa00001a5 0000000000000006 0000000000000006 ffff88003af9a800
ffff88003c385b08 ffffffffa00d52a4 ffff88003c385ba8 ffff88003c751bd8
ffff88003c751bc0 ffff88003e113600 ffff88003c385b18 ffffffffa00d530c
Call Trace:
[<ffffffffa00001a5>] ? rpc_net_ns+0x5/0x70 [sunrpc]
[<ffffffffa00d52a4>] __gss_pipe_release+0x54/0x90 [auth_rpcgss]
[<ffffffffa00d530c>] gss_pipe_free+0x2c/0x30 [auth_rpcgss]
[<ffffffffa00d678b>] gss_destroy+0x9b/0xf0 [auth_rpcgss]
[<ffffffffa000de63>] rpcauth_release+0x23/0x30 [sunrpc]
[<ffffffffa0001e81>] rpc_release_client+0x51/0xb0 [sunrpc]
[<ffffffffa00020d5>] rpc_shutdown_client+0xe5/0x170 [sunrpc]
[<ffffffff81098a14>] ? cpuacct_charge+0xa4/0xb0
[<ffffffff81098975>] ? cpuacct_charge+0x5/0xb0
[<ffffffffa019556f>] nfsd4_process_cb_update.isra.17+0x2f/0x210 [nfsd]
[<ffffffff819a4ac0>] ? _raw_spin_unlock_irq+0x30/0x60
[<ffffffff819a4acb>] ? _raw_spin_unlock_irq+0x3b/0x60
[<ffffffff810703ab>] ? process_one_work+0x15b/0x510
[<ffffffffa01957dd>] nfsd4_do_callback_rpc+0x8d/0xa0 [nfsd]
[<ffffffff8107041e>] process_one_work+0x1ce/0x510
[<ffffffff810703ab>] ? process_one_work+0x15b/0x510
[<ffffffff810712ab>] worker_thread+0x11b/0x370
[<ffffffff81071190>] ? manage_workers.isra.24+0x2b0/0x2b0
[<ffffffff8107854b>] kthread+0xdb/0xe0
[<ffffffff819a4ac0>] ? _raw_spin_unlock_irq+0x30/0x60
[<ffffffff81078470>] ? __init_kthread_worker+0x70/0x70
[<ffffffff819ac7dc>] ret_from_fork+0x7c/0xb0
[<ffffffff81078470>] ? __init_kthread_worker+0x70/0x70
Code: a5 01 00 a0 31 d2 31 f6 48 c7 c7 e0 84 e2 81 e8 f4 91 0a e1 48 8b 43 60 48 c7 c2 a5 01 00 a0 be 01 00 00 00 48 c7 c7 e0 84 e2 81 <48> 8b 98 10 07 00 00 e8 91 8f 0a e1 e8
+3c 4e 07 e1 48 83 c4 18
RIP [<ffffffffa00001f3>] rpc_net_ns+0x53/0x70 [sunrpc]
RSP <ffff88003c385ab8>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Pull NFS client bugfixes (part 2) from Trond Myklebust:
"Bugfixes:
- Fix a few credential reference leaks resulting from the
SP4_MACH_CRED NFSv4.1 state protection code.
- Fix the SUNRPC bloatometer footprint: convert a 256K hashtable into
the intended 64 byte structure.
- Fix a long standing XDR issue with FREE_STATEID
- Fix a potential WARN_ON spamming issue
- Fix a missing dprintk() kuid conversion
New features:
- Enable the NFSv4.1 state protection support for the WRITE and
COMMIT operations"
* tag 'nfs-for-3.12-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
SUNRPC: No, I did not intend to create a 256KiB hashtable
sunrpc: Add missing kuids conversion for printing
NFSv4.1: sp4_mach_cred: WARN_ON -> WARN_ON_ONCE
NFSv4.1: sp4_mach_cred: no need to ref count creds
NFSv4.1: fix SECINFO* use of put_rpccred
NFSv4.1: sp4_mach_cred: ask for WRITE and COMMIT
NFSv4.1 fix decode_free_stateid
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Fix the declaration of the gss_auth_hash_table so that it creates
a 16 bucket hashtable, as I had intended.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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