Pull user namespace and namespace infrastructure changes from Eric W Biederman:
"This set of changes starts with a few small enhnacements to the user
namespace. reboot support, allowing more arbitrary mappings, and
support for mounting devpts, ramfs, tmpfs, and mqueuefs as just the
user namespace root.
I do my best to document that if you care about limiting your
unprivileged users that when you have the user namespace support
enabled you will need to enable memory control groups.
There is a minor bug fix to prevent overflowing the stack if someone
creates way too many user namespaces.
The bulk of the changes are a continuation of the kuid/kgid push down
work through the filesystems. These changes make using uids and gids
typesafe which ensures that these filesystems are safe to use when
multiple user namespaces are in use. The filesystems converted for
3.9 are ceph, 9p, afs, ocfs2, gfs2, ncpfs, nfs, nfsd, and cifs. The
changes for these filesystems were a little more involved so I split
the changes into smaller hopefully obviously correct changes.
XFS is the only filesystem that remains. I was hoping I could get
that in this release so that user namespace support would be enabled
with an allyesconfig or an allmodconfig but it looks like the xfs
changes need another couple of days before it they are ready."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (93 commits)
cifs: Enable building with user namespaces enabled.
cifs: Convert struct cifs_ses to use a kuid_t and a kgid_t
cifs: Convert struct cifs_sb_info to use kuids and kgids
cifs: Modify struct smb_vol to use kuids and kgids
cifs: Convert struct cifsFileInfo to use a kuid
cifs: Convert struct cifs_fattr to use kuid and kgids
cifs: Convert struct tcon_link to use a kuid.
cifs: Modify struct cifs_unix_set_info_args to hold a kuid_t and a kgid_t
cifs: Convert from a kuid before printing current_fsuid
cifs: Use kuids and kgids SID to uid/gid mapping
cifs: Pass GLOBAL_ROOT_UID and GLOBAL_ROOT_GID to keyring_alloc
cifs: Use BUILD_BUG_ON to validate uids and gids are the same size
cifs: Override unmappable incoming uids and gids
nfsd: Enable building with user namespaces enabled.
nfsd: Properly compare and initialize kuids and kgids
nfsd: Store ex_anon_uid and ex_anon_gid as kuids and kgids
nfsd: Modify nfsd4_cb_sec to use kuids and kgids
nfsd: Handle kuids and kgids in the nfs4acl to posix_acl conversion
nfsd: Convert nfsxdr to use kuids and kgids
nfsd: Convert nfs3xdr to use kuids and kgids
...
Here is the big driver core merge for 3.9-rc1
There are two major series here, both of which touch lots of drivers all
over the kernel, and will cause you some merge conflicts:
- add a new function called devm_ioremap_resource() to properly be
able to check return values.
- remove CONFIG_EXPERIMENTAL
If you need me to provide a merged tree to handle these resolutions,
please let me know.
Other than those patches, there's not much here, some minor fixes and
updates.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core patches from Greg Kroah-Hartman:
"Here is the big driver core merge for 3.9-rc1
There are two major series here, both of which touch lots of drivers
all over the kernel, and will cause you some merge conflicts:
- add a new function called devm_ioremap_resource() to properly be
able to check return values.
- remove CONFIG_EXPERIMENTAL
Other than those patches, there's not much here, some minor fixes and
updates"
Fix up trivial conflicts
* tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (221 commits)
base: memory: fix soft/hard_offline_page permissions
drivercore: Fix ordering between deferred_probe and exiting initcalls
backlight: fix class_find_device() arguments
TTY: mark tty_get_device call with the proper const values
driver-core: constify data for class_find_device()
firmware: Ignore abort check when no user-helper is used
firmware: Reduce ifdef CONFIG_FW_LOADER_USER_HELPER
firmware: Make user-mode helper optional
firmware: Refactoring for splitting user-mode helper code
Driver core: treat unregistered bus_types as having no devices
watchdog: Convert to devm_ioremap_resource()
thermal: Convert to devm_ioremap_resource()
spi: Convert to devm_ioremap_resource()
power: Convert to devm_ioremap_resource()
mtd: Convert to devm_ioremap_resource()
mmc: Convert to devm_ioremap_resource()
mfd: Convert to devm_ioremap_resource()
media: Convert to devm_ioremap_resource()
iommu: Convert to devm_ioremap_resource()
drm: Convert to devm_ioremap_resource()
...
- Fix an Oops in the pNFS layoutget code
- Fix a number of NFSv4 and v4.1 state recovery deadlocks and hangs
due to the interaction of the session drain lock and state management
locks.
- Remove task->tk_xprt, which was hiding a lot of RCU dereferencing bugs
- Fix a long standing NFSv3 posix lock recovery bug.
- Revert commit 324d003b0c. It turned out
that the root cause of the deadlock was due to interactions with the
workqueues that have now been resolved.
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Merge tag 'nfs-for-3.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
- Fix an Oops in the pNFS layoutget code
- Fix a number of NFSv4 and v4.1 state recovery deadlocks and hangs due
to the interaction of the session drain lock and state management
locks.
- Remove task->tk_xprt, which was hiding a lot of RCU dereferencing
bugs
- Fix a long standing NFSv3 posix lock recovery bug.
- Revert commit 324d003b0c ("NFS: add nfs_sb_deactive_async to avoid
deadlock"). It turned out that the root cause of the deadlock was
due to interactions with the workqueues that have now been resolved.
* tag 'nfs-for-3.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (22 commits)
NLM: Ensure that we resend all pending blocking locks after a reclaim
umount oops when remove blocklayoutdriver first
sunrpc: silence build warning in gss_fill_context
nfs: remove kfree() redundant null checks
NFSv4.1: Don't decode skipped layoutgets
NFSv4.1: Fix bulk recall and destroy of layouts
NFSv4.1: Fix an ABBA locking issue with session and state serialisation
NFSv4: Fix a reboot recovery race when opening a file
NFSv4: Ensure delegation recall and byte range lock removal don't conflict
NFSv4: Fix up the return values of nfs4_open_delegation_recall
NFSv4.1: Don't lose locks when a server reboots during delegation return
NFSv4.1: Prevent deadlocks between state recovery and file locking
NFSv4: Allow the state manager to mark an open_owner as being recovered
SUNRPC: Add missing static declaration to _gss_mech_get_by_name
Revert "NFS: add nfs_sb_deactive_async to avoid deadlock"
SUNRPC: Nuke the tk_xprt macro
SUNRPC: Avoid RCU dereferences in the transport bind and connect code
SUNRPC: Fix an RCU dereference in xprt_reserve
SUNRPC: Pass pointers to struct rpc_xprt to the congestion window
SUNRPC: Fix an RCU dereference in xs_local_rpcbind
...
Since commit 620038f6d2, gcc is throwing the following warning:
CC [M] net/sunrpc/auth_gss/auth_gss.o
In file included from include/linux/sunrpc/types.h:14:0,
from include/linux/sunrpc/sched.h:14,
from include/linux/sunrpc/clnt.h:18,
from net/sunrpc/auth_gss/auth_gss.c:45:
net/sunrpc/auth_gss/auth_gss.c: In function ‘gss_pipe_downcall’:
include/linux/sunrpc/debug.h:45:10: warning: ‘timeout’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
printk(KERN_DEFAULT args); \
^
net/sunrpc/auth_gss/auth_gss.c:194:15: note: ‘timeout’ was declared here
unsigned int timeout;
^
If simple_get_bytes returns an error, then we'll end up calling printk
with an uninitialized timeout value. Reasonably harmless, but fairly
simple to fix by removing the printout of the uninitialised parameters.
Cc: Andy Adamson <andros@netapp.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
[Trond: just remove the parameters rather than initialising timeout]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
When reading kuids from the wire map them into the initial user
namespace, and validate the mapping succeded.
When reading kgids from the wire map them into the initial user
namespace, and validate the mapping succeded.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
When a new rpc connection is established with an in-kernel server, the
traffic passes through svc_process_common, and svc_set_client and down
into svcauth_unix_set_client if it is of type RPC_AUTH_NULL or
RPC_AUTH_UNIX.
svcauth_unix_set_client then looks at the uid of the credential we
have assigned to the incomming client and if we don't have the groups
already cached makes an upcall to get a list of groups that the client
can use.
The upcall encodes send a rpc message to user space encoding the uid
of the user whose groups we want to know. Encode the kuid of the user
in the initial user namespace as nfs mounts can only happen today in
the initial user namespace.
When a reply to an upcall comes in convert interpret the uid and gid values
from the rpc pipe as uids and gids in the initial user namespace and convert
them into kuids and kgids before processing them further.
When reading proc files listing the uid to gid list cache convert the
kuids and kgids from into uids and gids the initial user namespace. As we are
displaying server internal details it makes sense to display these values
from the servers perspective.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
When writing kuids onto the wire first map them into the initial user
namespace.
When writing kgids onto the wire first map them into the initial user
namespace.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
In svcauth_unix introduce a helper unix_gid_hash as otherwise the
expresion to generate the hash value is just too long.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
For each received uid call make_kuid and validate the result.
For each received gid call make_kgid and validate the result.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
- Use from_kuid when generating the on the wire uid values.
- Use make_kuid when reading on the wire values.
In gss_encode_v0_msg, since the uid in gss_upcall_msg is now a kuid_t
generate the necessary uid_t value on the stack copy it into
gss_msg->databuf where it can safely live until the message is no
longer needed.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
In auth unix there are a couple of places INVALID_GID is used a
sentinel to mark the end of uc_gids array. Use gid_valid
as a type safe way to verify we have not hit the end of
valid data in the array.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
When printing kuids and kgids for debugging purpropses convert them
to ordinary integers so their values can be fed to the oridnary
print functions.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
In unx_create_cred directly assign gids from acred->group_info
to cred->uc_gids.
In unx_match directly compare uc_gids with group_info.
Now that both group_info and unx_cred gids are stored as kgids
this is valid and the extra layer of translation can be removed.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
When comparing uids use uid_eq instead of ==.
When comparing gids use gid_eq instead of ==.
And unfortunate cost of type safety.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Convert variables that store uids and gids to be of type
kuid_t and kgid_t instead of type uid_t and gid_t.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Instead of (uid_t)0 use GLOBAL_ROOT_UID.
Instead of (gid_t)0 use GLOBAL_ROOT_GID.
Instead of (uid_t)-1 use INVALID_UID
Instead of (gid_t)-1 use INVALID_GID.
Instead of NOGROUP use INVALID_GID.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Pull networking fixes from David Miller:
1) Revert iwlwifi reclaimed packet tracking, it causes problems for a
bunch of folks. From Emmanuel Grumbach.
2) Work limiting code in brcmsmac wifi driver can clear tx status
without processing the event. From Arend van Spriel.
3) rtlwifi USB driver processes wrong SKB, fix from Larry Finger.
4) l2tp tunnel delete can race with close, fix from Tom Parkin.
5) pktgen_add_device() failures are not checked at all, fix from Cong
Wang.
6) Fix unintentional removal of carrier off from tun_detach(),
otherwise we confuse userspace, from Michael S. Tsirkin.
7) Don't leak socket reference counts and ubufs in vhost-net driver,
from Jason Wang.
8) vmxnet3 driver gets it's initial carrier state wrong, fix from Neil
Horman.
9) Protect against USB networking devices which spam the host with 0
length frames, from Bjørn Mork.
10) Prevent neighbour overflows in ipv6 for locally destined routes,
from Marcelo Ricardo. This is the best short-term fix for this, a
longer term fix has been implemented in net-next.
11) L2TP uses ipv4 datagram routines in it's ipv6 code, whoops. This
mistake is largely because the ipv6 functions don't even have some
kind of prefix in their names to suggest they are ipv6 specific.
From Tom Parkin.
12) Check SYN packet drops properly in tcp_rcv_fastopen_synack(), from
Yuchung Cheng.
13) Fix races and TX skb freeing bugs in via-rhine's NAPI support, from
Francois Romieu and your's truly.
14) Fix infinite loops and divides by zero in TCP congestion window
handling, from Eric Dumazet, Neal Cardwell, and Ilpo Järvinen.
15) AF_PACKET tx ring handling can leak kernel memory to userspace, fix
from Phil Sutter.
16) Fix error handling in ipv6 GRE tunnel transmit, from Tommi Rantala.
17) Protect XEN netback driver against hostile frontend putting garbage
into the rings, don't leak pages in TX GOP checking, and add proper
resource releasing in error path of xen_netbk_get_requests(). From
Ian Campbell.
18) SCTP authentication keys should be cleared out and released with
kzfree(), from Daniel Borkmann.
19) L2TP is a bit too clever trying to maintain skb->truesize, and ends
up corrupting socket memory accounting to the point where packet
sending is halted indefinitely. Just remove the adjustments
entirely, they aren't really needed. From Eric Dumazet.
20) ATM Iphase driver uses a data type with the same name as the S390
headers, rename to fix the build. From Heiko Carstens.
21) Fix a typo in copying the inner network header offset from one SKB
to another, from Pravin B Shelar.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (56 commits)
net: sctp: sctp_endpoint_free: zero out secret key data
net: sctp: sctp_setsockopt_auth_key: use kzfree instead of kfree
atm/iphase: rename fregt_t -> ffreg_t
net: usb: fix regression from FLAG_NOARP code
l2tp: dont play with skb->truesize
net: sctp: sctp_auth_key_put: use kzfree instead of kfree
netback: correct netbk_tx_err to handle wrap around.
xen/netback: free already allocated memory on failure in xen_netbk_get_requests
xen/netback: don't leak pages on failure in xen_netbk_tx_check_gop.
xen/netback: shutdown the ring if it contains garbage.
net: qmi_wwan: add more Huawei devices, including E320
net: cdc_ncm: add another Huawei vendor specific device
ipv6/ip6_gre: fix error case handling in ip6gre_tunnel_xmit()
tcp: fix for zero packets_in_flight was too broad
brcmsmac: rework of mac80211 .flush() callback operation
ssb: unregister gpios before unloading ssb
bcma: unregister gpios before unloading bcma
rtlwifi: Fix scheduling while atomic bug
net: usbnet: fix tx_dropped statistics
tcp: ipv6: Update MIB counters for drops
...
tk_xprt is just a shortcut for tk_client->cl_xprt, however cl_xprt is
defined as an __rcu variable. Replace dereferences of tk_xprt with
non-rcu dereferences where it is safe to do so.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
The datagram_*_ctl functions in net/ipv6/datagram.c are IPv6-specific. Since
datagram_send_ctl is publicly exported it should be appropriately named to
reflect the fact that it's for IPv6 only.
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This fixes a livelock in the xprt->sending queue where we end up never
making progress on lower priority tasks because sleep_on_priority()
keeps adding new tasks with the same owner to the head of the queue,
and priority bumps mean that we keep resetting the queue->owner to
whatever task is at the head of the queue.
Regression introduced by commit c05eecf636
(SUNRPC: Don't allow low priority tasks to pre-empt higher priority ones).
Reported-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This is to fix up a build problem with a wireless driver due to the
dynamic-debug patches in this branch.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- Fix a socket lock leak in net/sunrpc/xprt.c
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Merge tag 'nfs-for-3.8-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfix from Trond Myklebust:
- Fix a socket lock leak in net/sunrpc/xprt.c
* tag 'nfs-for-3.8-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
SUNRPC: Ensure we release the socket write lock if the rpc_task exits early
The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
CC: "J. Bruce Fields" <bfields@fieldses.org>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Fix new kernel-doc warnings in clnt.c:
Warning(net/sunrpc/clnt.c:561): No description found for parameter 'flavor'
Warning(net/sunrpc/clnt.c:561): Excess function parameter 'auth' description in 'rpc_clone_client_set_auth'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: linux-nfs@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
If the rpc_task exits while holding the socket write lock before it has
allocated an rpc slot, then the usual mechanism for releasing the write
lock in xprt_release() is defeated.
The problem occurs if the call to xprt_lock_write() initially fails, so
that the rpc_task is put on the xprt->sending wait queue. If the task
exits after being assigned the lock by __xprt_lock_write_func, but
before it has retried the call to xprt_lock_and_alloc_slot(), then
it calls xprt_release() while holding the write lock, but will
immediately exit due to the test for task->tk_rqstp != NULL.
Reported-by: Chris Perl <chris.perl@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org [>= 3.1]
Partially revert commit (SUNRPC: add WARN_ON_ONCE for potential deadlock).
The looping behaviour has been tracked down to a knownn issue with
workqueues, and a workaround has now been implemented.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Weston Andros Adamson <dros@netapp.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Bruce Fields <bfields@fieldses.org>
Cc: stable@vger.kernel.org [>= 3.7]
This patch ensures that we free the rpc_task after the cleanup callbacks
are done in order to avoid a deadlock problem that can be triggered if
the callback needs to wait for another workqueue item to complete.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Weston Andros Adamson <dros@netapp.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Bruce Fields <bfields@fieldses.org>
Cc: stable@vger.kernel.org
Pull nfsd update from Bruce Fields:
"Included this time:
- more nfsd containerization work from Stanislav Kinsbursky: we're
not quite there yet, but should be by 3.9.
- NFSv4.1 progress: implementation of basic backchannel security
negotiation and the mandatory BACKCHANNEL_CTL operation. See
http://wiki.linux-nfs.org/wiki/index.php/Server_4.0_and_4.1_issues
for remaining TODO's
- Fixes for some bugs that could be triggered by unusual compounds.
Our xdr code wasn't designed with v4 compounds in mind, and it
shows. A more thorough rewrite is still a todo.
- If you've ever seen "RPC: multiple fragments per record not
supported" logged while using some sort of odd userland NFS client,
that should now be fixed.
- Further work from Jeff Layton on our mechanism for storing
information about NFSv4 clients across reboots.
- Further work from Bryan Schumaker on his fault-injection mechanism
(which allows us to discard selective NFSv4 state, to excercise
rarely-taken recovery code paths in the client.)
- The usual mix of miscellaneous bugs and cleanup.
Thanks to everyone who tested or contributed this cycle."
* 'for-3.8' of git://linux-nfs.org/~bfields/linux: (111 commits)
nfsd4: don't leave freed stateid hashed
nfsd4: free_stateid can use the current stateid
nfsd4: cleanup: replace rq_resused count by rq_next_page pointer
nfsd: warn on odd reply state in nfsd_vfs_read
nfsd4: fix oops on unusual readlike compound
nfsd4: disable zero-copy on non-final read ops
svcrpc: fix some printks
NFSD: Correct the size calculation in fault_inject_write
NFSD: Pass correct buffer size to rpc_ntop
nfsd: pass proper net to nfsd_destroy() from NFSd kthreads
nfsd: simplify service shutdown
nfsd: replace boolean nfsd_up flag by users counter
nfsd: simplify NFSv4 state init and shutdown
nfsd: introduce helpers for generic resources init and shutdown
nfsd: make NFSd service structure allocated per net
nfsd: make NFSd service boot time per-net
nfsd: per-net NFSd up flag introduced
nfsd: move per-net startup code to separated function
nfsd: pass net to __write_ports() and down
nfsd: pass net to nfsd_set_nrthreads()
...
There are SUNRPC clients, which program doesn't have pipe_dir_name. These
clients can be skipped on PipeFS events, because nothing have to be created or
destroyed. But instead of breaking in case of such a client was found, search
for suitable client over clients list have to be continued. Otherwise some
clients could not be covered by PipeFS event handler.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: stable@vger.kernel.org [>= v3.4]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Silence the unnecessary warning "unhandled error (111) connecting to..."
and convert it to a dprintk for debugging purposes.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Currently, when an RPCSEC_GSS context has expired or is non-existent
and the users (Kerberos) credentials have also expired or are non-existent,
the client receives the -EKEYEXPIRED error and tries to refresh the context
forever. If an application is performing I/O, or other work against the share,
the application hangs, and the user is not prompted to refresh/establish their
credentials. This can result in a denial of service for other users.
Users are expected to manage their Kerberos credential lifetimes to mitigate
this issue.
Move the -EKEYEXPIRED handling into the RPC layer. Try tk_cred_retry number
of times to refresh the gss_context, and then return -EACCES to the application.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Only use the default GSSD_MIN_TIMEOUT if the gss downcall timeout is zero.
Store the full lifetime in gc_expiry (not 3/4 of the lifetime) as subsequent
patches will use the gc_expiry to determine buffered WRITE behavior in the
face of expired or soon to be expired gss credentials.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Currently, the priority queues attempt to be 'fair' to lower priority
tasks by scheduling them after a certain number of higher priority tasks
have run. The problem is that both the transport send queue and
the NFSv4.1 session slot queue have strong ordering requirements.
This patch therefore removes the fairness code in favour of strong
ordering of task priorities.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
We want to preserve the rpc_task priority for things like writebacks,
that may have differing levels of urgency.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Over TCP, RPC's are preceded by a single 4-byte field telling you how
long the rpc is (in bytes). The spec also allows you to send an RPC in
multiple such records (the high bit of the length field is used to tell
you whether this is the final record).
We've survived for years without supporting this because in practice the
clients we care about don't use it. But the userland rpc libraries do,
and every now and then an experimental client will run into this. (Most
recently I noticed it while trying to write a pynfs check.) And we're
really on the wrong side of the spec here--let's fix this.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Keep a separate field, sk_datalen, that tracks only the data contained
in a fragment, not including the fragment header.
For now, this is always just max(0, sk_tcplen - 4), but after we allow
multiple fragments sk_datalen will accumulate the total rpc data size
while sk_tcplen only tracks progress receiving the current fragment.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
The full reclen doesn't include the fragment header, but sk_tcplen does.
Fix this to make it an apples-to-apples comparison.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Soon we want to support multiple fragments, in which case it may be
legal for a single fragment to be smaller than 8 bytes, so we'll want to
delay this check till we've reached the last fragment.
Also fix an outdated comment.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Byte-swapping in place is always a little dubious.
Let's instead define this field to always be big-endian, and do the
swapping on demand where we need it.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
