summaryrefslogtreecommitdiff
path: root/fs/cifs
AgeCommit message (Collapse)AuthorFilesLines
2017-02-25mm, fs: reduce fault, page_mkwrite, and pfn_mkwrite to take only vmfDave Jiang1-1/+1
->fault(), ->page_mkwrite(), and ->pfn_mkwrite() calls do not need to take a vma and vmf parameter when the vma already resides in vmf. Remove the vma parameter to simplify things. [arnd@arndb.de: fix ARM build] Link: http://lkml.kernel.org/r/20170125223558.1451224-1-arnd@arndb.de Link: http://lkml.kernel.org/r/148521301778.19116.10840599906674778980.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-24Merge branch 'for-linus' of ↵Linus Torvalds1-3/+4
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull namespace updates from Eric Biederman: "There is a lot here. A lot of these changes result in subtle user visible differences in kernel behavior. I don't expect anything will care but I will revert/fix things immediately if any regressions show up. From Seth Forshee there is a continuation of the work to make the vfs ready for unpriviled mounts. We had thought the previous changes prevented the creation of files outside of s_user_ns of a filesystem, but it turns we missed the O_CREAT path. Ooops. Pavel Tikhomirov and Oleg Nesterov worked together to fix a long standing bug in the implemenation of PR_SET_CHILD_SUBREAPER where only children that are forked after the prctl are considered and not children forked before the prctl. The only known user of this prctl systemd forks all children after the prctl. So no userspace regressions will occur. Holding earlier forked children to the same rules as later forked children creates a semantic that is sane enough to allow checkpoing of processes that use this feature. There is a long delayed change by Nikolay Borisov to limit inotify instances inside a user namespace. Michael Kerrisk extends the API for files used to maniuplate namespaces with two new trivial ioctls to allow discovery of the hierachy and properties of namespaces. Konstantin Khlebnikov with the help of Al Viro adds code that when a network namespace exits purges it's sysctl entries from the dcache. As in some circumstances this could use a lot of memory. Vivek Goyal fixed a bug with stacked filesystems where the permissions on the wrong inode were being checked. I continue previous work on ptracing across exec. Allowing a file to be setuid across exec while being ptraced if the tracer has enough credentials in the user namespace, and if the process has CAP_SETUID in it's own namespace. Proc files for setuid or otherwise undumpable executables are now owned by the root in the user namespace of their mm. Allowing debugging of setuid applications in containers to work better. A bug I introduced with permission checking and automount is now fixed. The big change is to mark the mounts that the kernel initiates as a result of an automount. This allows the permission checks in sget to be safely suppressed for this kind of mount. As the permission check happened when the original filesystem was mounted. Finally a special case in the mount namespace is removed preventing unbounded chains in the mount hash table, and making the semantics simpler which benefits CRIU. The vfs fix along with related work in ima and evm I believe makes us ready to finish developing and merge fully unprivileged mounts of the fuse filesystem. The cleanups of the mount namespace makes discussing how to fix the worst case complexity of umount. The stacked filesystem fixes pave the way for adding multiple mappings for the filesystem uids so that efficient and safer containers can be implemented" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: proc/sysctl: Don't grab i_lock under sysctl_lock. vfs: Use upper filesystem inode in bprm_fill_uid() proc/sysctl: prune stale dentries during unregistering mnt: Tuck mounts under others instead of creating shadow/side mounts. prctl: propagate has_child_subreaper flag to every descendant introduce the walk_process_tree() helper nsfs: Add an ioctl() to return owner UID of a userns fs: Better permission checking for submounts exit: fix the setns() && PR_SET_CHILD_SUBREAPER interaction vfs: open() with O_CREAT should not create inodes with unknown ids nsfs: Add an ioctl() to return the namespace type proc: Better ownership of files for non-dumpable tasks in user namespaces exec: Remove LSM_UNSAFE_PTRACE_CAP exec: Test the ptracer's saved cred to see if the tracee can gain caps exec: Don't reset euid and egid when the tracee has CAP_SETUID inotify: Convert to using per-namespace limits
2017-02-02CIFS: Allow to switch on encryption with seal mount optionPavel Shilovsky2-31/+43
This allows users to inforce encryption for SMB3 shares if a server supports it. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Add capability to decrypt big read responsesPavel Shilovsky3-13/+169
Allow to decrypt transformed packets that are bigger than the big buffer size. In particular it is used for read responses that can only exceed the big buffer size. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Decrypt and process small encrypted packetsPavel Shilovsky7-3/+243
Allow to decrypt transformed packets, find a corresponding mid and process as usual further. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Add copy into pages callback for a read operationPavel Shilovsky2-6/+49
Since we have two different types of reads (pagecache and direct) we need to process such responses differently after decryption of a packet. The change allows to specify a callback that copies a read payload data into preallocated pages. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Add mid handle callbackPavel Shilovsky5-11/+20
We need to process read responses differently because the data should go directly into preallocated pages. This can be done by specifying a mid handle callback. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Add transform header handling callbacksPavel Shilovsky2-5/+15
We need to recognize and parse transformed packets in demultiplex thread to find a corresponsing mid and process it further. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Encrypt SMB3 requests before sendingPavel Shilovsky10-10/+320
This change allows to encrypt packets if it is required by a server for SMB sessions or tree connections. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Enable encryption during session setup phasePavel Shilovsky2-22/+12
In order to allow encryption on SMB connection we need to exchange a session key and generate encryption and decryption keys. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Add capability to transform requests before sendingPavel Shilovsky3-33/+136
This will allow us to do protocol specific tranformations of packets before sending to the server. For SMB3 it can be used to support encryption. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Separate RFC1001 length processing for SMB2 readPavel Shilovsky4-25/+74
Allocate and initialize SMB2 read request without RFC1001 length field to directly call cifs_send_recv() rather than SendReceive2() in a read codepath. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Separate SMB2 sync header processingPavel Shilovsky2-20/+35
Do not process RFC1001 length in smb2_hdr_assemble() because it is not a part of SMB2 header. This allows to cleanup the code and adds a possibility combine several SMB2 packets into one for compounding. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Send RFC1001 length in a separate iovPavel Shilovsky6-95/+174
In order to simplify further encryption support we need to separate RFC1001 length and SMB2 header when sending a request. Put the length field in iov[0] and the rest of the packet into following iovs. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Make send_cancel take rqst as argumentPavel Shilovsky3-17/+22
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Make SendReceive2() takes resp iovPavel Shilovsky5-100/+136
Now SendReceive2 frees the first iov and returns a response buffer in it that increases a code complexity. Simplify this by making a caller responsible for freeing request buffer itself and returning a response buffer in a separate iov. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Separate SMB2 header structurePavel Shilovsky7-148/+174
In order to support compounding and encryption we need to separate RFC1001 length field and SMB2 header structure because the protocol treats them differently. This change will allow to simplify parsing of such complex SMB2 packets further. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02CIFS: Fix splice read for non-cached filesPavel Shilovsky1-1/+9
Currently we call copy_page_to_iter() for uncached reading into a pipe. This is wrong because it treats pages as VFS cache pages and copies references rather than actual data. When we are trying to read from the pipe we end up calling page_cache_pipe_buf_confirm() which returns -ENODATA. This error is translated into 0 which is returned to a user. This issue is reproduced by running xfs-tests suite (generic test #249) against mount points with "cache=none". Fix it by mapping pages manually and calling copy_to_iter() that copies data into the pipe. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-02-02cifs: Add soft dependenciesJean Delvare1-0/+12
List soft dependencies of cifs so that mkinitrd and dracut can include the required helper modules. Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Steve French <sfrench@samba.org>
2017-02-02cifs: Only select the required crypto modulesJean Delvare1-2/+3
The sha256 and cmac crypto modules are only needed for SMB2+, so move the select statements to config CIFS_SMB2. Also select CRYPTO_AES there as SMB2+ needs it. Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Steve French <sfrench@samba.org>
2017-02-02cifs: Simplify SMB2 and SMB311 dependenciesJean Delvare1-3/+2
* CIFS_SMB2 depends on CIFS, which depends on INET and selects NLS. So these dependencies do not need to be repeated for CIFS_SMB2. * CIFS_SMB311 depends on CIFS_SMB2, which depends on INET. So this dependency doesn't need to be repeated for CIFS_SMB311. Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Steve French <sfrench@samba.org>
2017-02-01fs: Better permission checking for submountsEric W. Biederman1-3/+4
To support unprivileged users mounting filesystems two permission checks have to be performed: a test to see if the user allowed to create a mount in the mount namespace, and a test to see if the user is allowed to access the specified filesystem. The automount case is special in that mounting the original filesystem grants permission to mount the sub-filesystems, to any user who happens to stumble across the their mountpoint and satisfies the ordinary filesystem permission checks. Attempting to handle the automount case by using override_creds almost works. It preserves the idea that permission to mount the original filesystem is permission to mount the sub-filesystem. Unfortunately using override_creds messes up the filesystems ordinary permission checks. Solve this by being explicit that a mount is a submount by introducing vfs_submount, and using it where appropriate. vfs_submount uses a new mount internal mount flags MS_SUBMOUNT, to let sget and friends know that a mount is a submount so they can take appropriate action. sget and sget_userns are modified to not perform any permission checks on submounts. follow_automount is modified to stop using override_creds as that has proven problemantic. do_mount is modified to always remove the new MS_SUBMOUNT flag so that we know userspace will never by able to specify it. autofs4 is modified to stop using current_real_cred that was put in there to handle the previous version of submount permission checking. cifs is modified to pass the mountpoint all of the way down to vfs_submount. debugfs is modified to pass the mountpoint all of the way down to trace_automount by adding a new parameter. To make this change easier a new typedef debugfs_automount_t is introduced to capture the type of the debugfs automount function. Cc: stable@vger.kernel.org Fixes: 069d5ac9ae0d ("autofs: Fix automounts by using current_real_cred()->uid") Fixes: aeaa4a79ff6a ("fs: Call d_automount with the filesystems creds") Reviewed-by: Trond Myklebust <trond.myklebust@primarydata.com> Reviewed-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2017-01-14cifs: initialize file_info_lockRabin Vincent1-0/+1
Reviewed-by: Jeff Layton <jlayton@redhat.com> CC: Stable <stable@vger.kernel.org> file_info_lock is not initalized in initiate_cifs_search(), leading to the following splat after a simple "mount.cifs ... dir && ls dir/": BUG: spinlock bad magic on CPU#0, ls/486 lock: 0xffff880009301110, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 CPU: 0 PID: 486 Comm: ls Not tainted 4.9.0 #27 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ffffc900042f3db0 ffffffff81327533 0000000000000000 ffff880009301110 ffffc900042f3dd0 ffffffff810baf75 ffff880009301110 ffffffff817ae077 ffffc900042f3df0 ffffffff810baff6 ffff880009301110 ffff880008d69900 Call Trace: [<ffffffff81327533>] dump_stack+0x65/0x92 [<ffffffff810baf75>] spin_dump+0x85/0xe0 [<ffffffff810baff6>] spin_bug+0x26/0x30 [<ffffffff810bb159>] do_raw_spin_lock+0xe9/0x130 [<ffffffff8159ad2f>] _raw_spin_lock+0x1f/0x30 [<ffffffff8127e50d>] cifs_closedir+0x4d/0x100 [<ffffffff81181cfd>] __fput+0x5d/0x160 [<ffffffff81181e3e>] ____fput+0xe/0x10 [<ffffffff8109410e>] task_work_run+0x7e/0xa0 [<ffffffff81002512>] exit_to_usermode_loop+0x92/0xa0 [<ffffffff810026f9>] syscall_return_slowpath+0x49/0x50 [<ffffffff8159b484>] entry_SYSCALL_64_fastpath+0xa7/0xa9 Fixes: 3afca265b5f53a0 ("Clarify locking of cifs file and tcon structures and make more granular") Signed-off-by: Rabin Vincent <rabinv@axis.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds4-4/+4
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-24Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6Linus Torvalds14-90/+177
Pull cifs fixes from Steve French: "This ncludes various cifs/smb3 bug fixes, mostly for stable as well. In the next week I expect that Germano will have some reconnection fixes, and also I expect to have the remaining pieces of the snapshot enablement and SMB3 ACLs, but wanted to get this set of bug fixes in" * 'for-next' of git://git.samba.org/sfrench/cifs-2.6: cifs_get_root shouldn't use path with tree name Fix default behaviour for empty domains and add domainauto option cifs: use %16phN for formatting md5 sum cifs: Fix smbencrypt() to stop pointing a scatterlist at the stack CIFS: Fix a possible double locking of mutex during reconnect CIFS: Fix a possible memory corruption during reconnect CIFS: Fix a possible memory corruption in push locks CIFS: Fix missing nls unload in smb2_reconnect() CIFS: Decrease verbosity of ioctl call SMB3: parsing for new snapshot timestamp mount parm
2016-12-18Merge uncontroversial parts of branch 'readlink' of ↵Linus Torvalds1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs Pull partial readlink cleanups from Miklos Szeredi. This is the uncontroversial part of the readlink cleanup patch-set that simplifies the default readlink handling. Miklos and Al are still discussing the rest of the series. * git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: vfs: make generic_readlink() static vfs: remove ".readlink = generic_readlink" assignments vfs: default to generic_readlink() vfs: replace calling i_op->readlink with vfs_readlink() proc/self: use generic_readlink ecryptfs: use vfs_get_link() bad_inode: add missing i_op initializers
2016-12-15cifs_get_root shouldn't use path with tree nameSachin Prabhu4-5/+7
When a server returns the optional flag SMB_SHARE_IS_IN_DFS in response to a tree connect, cifs_build_path_to_root() will return a pathname which includes the hostname. This causes problems with cifs_get_root() which separates each component and does a lookup for each component of the path which in this case will incorrectly include looking up the hostname component as a path component. We encountered a problem with dfs shares hosted by a Netapp. When connecting to nodes pointed to by the DFS share. The tree connect for these nodes return SMB_SHARE_IS_IN_DFS resulting failures in lookup in cifs_get_root(). RH bz: 1373153 The patch was tested against a Netapp simulator and by a user using an actual Netapp server. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reported-by: Pierguido Lambri <plambri@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-15Fix default behaviour for empty domains and add domainauto optionGermano Percossi3-5/+18
With commit 2b149f119 many things have been fixed/introduced. However, the default behaviour for RawNTLMSSP authentication seems to be wrong in case the domain is not passed on the command line. The main points (see below) of the patch are: - It alignes behaviour with Windows clients - It fixes backward compatibility - It fixes UPN I compared this behavour with the one from a Windows 10 command line client. When no domains are specified on the command line, I traced the packets and observed that the client does send an empty domain to the server. In the linux kernel case, the empty domain is replaced by the primary domain communicated by the SMB server. This means that, if the credentials are valid against the local server but that server is part of a domain, then the kernel module will ask to authenticate against that domain and we will get LOGON failure. I compared the packet trace from the smbclient when no domain is passed and, in that case, a default domain from the client smb.conf is taken. Apparently, connection succeeds anyway, because when the domain passed is not valid (in my case WORKGROUP), then the local one is tried and authentication succeeds. I tried with any kind of invalid domain and the result was always a connection. So, trying to interpret what to do and picking a valid domain if none is passed, seems the wrong thing to do. To this end, a new option "domainauto" has been added in case the user wants a mechanism for guessing. Without this patch, backward compatibility also is broken. With kernel 3.10, the default auth mechanism was NTLM. One of our testing servers accepted NTLM and, because no domains are passed, authentication was local. Moving to RawNTLMSSP forced us to change our command line to add a fake domain to pass to prevent this mechanism to kick in. For the same reasons, UPN is broken because the domain is specified in the username. The SMB server will work out the domain from the UPN and authenticate against the right server. Without the patch, though, given the domain is empty, it gets replaced with another domain that could be the wrong one for the authentication. Signed-off-by: Germano Percossi <germano.percossi@citrix.com> Acked-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-15cifs: use %16phN for formatting md5 sumRasmus Villemoes1-7/+2
Passing a gazillion arguments takes a lot of code: add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-253 (-253) Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-14cifs: Fix smbencrypt() to stop pointing a scatterlist at the stackAndy Lutomirski1-32/+8
smbencrypt() points a scatterlist to the stack, which is breaks if CONFIG_VMAP_STACK=y. Fix it by switching to crypto_cipher_encrypt_one(). The new code should be considerably faster as an added benefit. This code is nearly identical to some code that Eric Biggers suggested. Cc: stable@vger.kernel.org # 4.9 only Reported-by: Eric Biggers <ebiggers3@gmail.com> Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-13Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-blockLinus Torvalds2-0/+2
Pull block layer updates from Jens Axboe: "This is the main block pull request this series. Contrary to previous release, I've kept the core and driver changes in the same branch. We always ended up having dependencies between the two for obvious reasons, so makes more sense to keep them together. That said, I'll probably try and keep more topical branches going forward, especially for cycles that end up being as busy as this one. The major parts of this pull request is: - Improved support for O_DIRECT on block devices, with a small private implementation instead of using the pig that is fs/direct-io.c. From Christoph. - Request completion tracking in a scalable fashion. This is utilized by two components in this pull, the new hybrid polling and the writeback queue throttling code. - Improved support for polling with O_DIRECT, adding a hybrid mode that combines pure polling with an initial sleep. From me. - Support for automatic throttling of writeback queues on the block side. This uses feedback from the device completion latencies to scale the queue on the block side up or down. From me. - Support from SMR drives in the block layer and for SD. From Hannes and Shaun. - Multi-connection support for nbd. From Josef. - Cleanup of request and bio flags, so we have a clear split between which are bio (or rq) private, and which ones are shared. From Christoph. - A set of patches from Bart, that improve how we handle queue stopping and starting in blk-mq. - Support for WRITE_ZEROES from Chaitanya. - Lightnvm updates from Javier/Matias. - Supoort for FC for the nvme-over-fabrics code. From James Smart. - A bunch of fixes from a whole slew of people, too many to name here" * 'for-4.10/block' of git://git.kernel.dk/linux-block: (182 commits) blk-stat: fix a few cases of missing batch flushing blk-flush: run the queue when inserting blk-mq flush elevator: make the rqhash helpers exported blk-mq: abstract out blk_mq_dispatch_rq_list() helper blk-mq: add blk_mq_start_stopped_hw_queue() block: improve handling of the magic discard payload blk-wbt: don't throttle discard or write zeroes nbd: use dev_err_ratelimited in io path nbd: reset the setup task for NBD_CLEAR_SOCK nvme-fabrics: Add FC LLDD loopback driver to test FC-NVME nvme-fabrics: Add target support for FC transport nvme-fabrics: Add host support for FC transport nvme-fabrics: Add FC transport LLDD api definitions nvme-fabrics: Add FC transport FC-NVME definitions nvme-fabrics: Add FC transport error codes to nvme.h Add type 0x28 NVME type code to scsi fc headers nvme-fabrics: patch target code in prep for FC transport support nvme-fabrics: set sqe.command_id in core not transports parser: add u64 number parser nvme-rdma: align to generic ib_event logging helper ...
2016-12-09vfs: remove ".readlink = generic_readlink" assignmentsMiklos Szeredi1-1/+0
If .readlink == NULL implies generic_readlink(). Generated by: to_del="\.readlink.*=.*generic_readlink" for i in `git grep -l $to_del`; do sed -i "/$to_del"/d $i; done Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-05CIFS: Fix a possible double locking of mutex during reconnectPavel Shilovsky4-6/+19
With the current code it is possible to lock a mutex twice when a subsequent reconnects are triggered. On the 1st reconnect we reconnect sessions and tcons and then persistent file handles. If the 2nd reconnect happens during the reconnecting of persistent file handles then the following sequence of calls is observed: cifs_reopen_file -> SMB2_open -> small_smb2_init -> smb2_reconnect -> cifs_reopen_persistent_file_handles -> cifs_reopen_file (again!). So, we are trying to acquire the same cfile->fh_mutex twice which is wrong. Fix this by moving reconnecting of persistent handles to the delayed work (smb2_reconnect_server) and submitting this work every time we reconnect tcon in SMB2 commands handling codepath. This can also lead to corruption of a temporary file list in cifs_reopen_persistent_file_handles() because we can recursively call this function twice. Cc: Stable <stable@vger.kernel.org> # v4.9+ Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-12-05CIFS: Fix a possible memory corruption during reconnectPavel Shilovsky5-31/+85
We can not unlock/lock cifs_tcp_ses_lock while walking through ses and tcon lists because it can corrupt list iterator pointers and a tcon structure can be released if we don't hold an extra reference. Fix it by moving a reconnect process to a separate delayed work and acquiring a reference to every tcon that needs to be reconnected. Also do not send an echo request on newly established connections. CC: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-12-05CIFS: Fix a possible memory corruption in push locksPavel Shilovsky1-1/+1
If maxBuf is not 0 but less than a size of SMB2 lock structure we can end up with a memory corruption. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-12-05CIFS: Fix missing nls unload in smb2_reconnect()Pavel Shilovsky1-1/+1
Cc: Stable <stable@vger.kernel.org> Acked-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-12-03CIFS: Decrease verbosity of ioctl callPavel Shilovsky1-1/+1
Cc: Stable <stable@vger.kernel.org> # v4.9+ Reviewed-by: Aurelien Aptel <aaptel@suse.com> Acked-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-12-01SMB3: parsing for new snapshot timestamp mount parmSteve French2-3/+37
New mount option "snapshot=<time>" to allow mounting an earlier version of the remote volume (if such a snapshot exists on the server). Note that eventually specifying a snapshot time of 1 will allow the user to mount the oldest snapshot. A subsequent patch add the processing for that and another for actually specifying the "time warp" create context on SMB2/SMB3 open. Check to make sure SMB2 negotiated, and ensure that we use a different tcon if mount same share twice but with different snaphshot times Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-11-29CIFS: iterate over posix acl xattr entry correctly in ACL_to_cifs_posix()Eryu Guan1-2/+2
Commit 2211d5ba5c6c ("posix_acl: xattr representation cleanups") removes the typedefs and the zero-length a_entries array in struct posix_acl_xattr_header, and uses bare struct posix_acl_xattr_header and struct posix_acl_xattr_entry directly. But it failed to iterate over posix acl slots when converting posix acls to CIFS format, which results in several test failures in xfstests (generic/053 generic/105) when testing against a samba v1 server, starting from v4.9-rc1 kernel. e.g. [root@localhost xfstests]# diff -u tests/generic/105.out /root/xfstests/results//generic/105.out.bad --- tests/generic/105.out 2016-09-19 16:33:28.577962575 +0800 +++ /root/xfstests/results//generic/105.out.bad 2016-10-22 15:41:15.201931110 +0800 @@ -1,3 +1,4 @@ QA output created by 105 -rw-r--r-- root +setfacl: subdir: Invalid argument -rw-r--r-- root Fix it by introducing a new "ace" var, like what cifs_copy_posix_acl() does, and iterating posix acl xattr entries over it in the for loop. Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-11-29Call echo service immediately after socket reconnectSachin Prabhu1-7/+18
Commit 4fcd1813e640 ("Fix reconnect to not defer smb3 session reconnect long after socket reconnect") changes the behaviour of the SMB2 echo service and causes it to renegotiate after a socket reconnect. However under default settings, the echo service could take up to 120 seconds to be scheduled. The patch forces the echo service to be called immediately resulting a negotiate call being made immediately on reconnect. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-11-29CIFS: Fix BUG() in calc_seckey()Sachin Prabhu1-3/+8
Andy Lutromirski's new virtually mapped kernel stack allocations moves kernel stacks the vmalloc area. This triggers the bug kernel BUG at ./include/linux/scatterlist.h:140! at calc_seckey()->sg_init() Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com>
2016-11-01block,fs: untangle fs.h and blk_types.hChristoph Hellwig2-0/+2
Nothing in fs.h should require blk_types.h to be included. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-14CIFS: Retrieve uid and gid from special sid if enabledSteve French1-0/+123
New mount option "idsfromsid" indicates to cifs.ko that it should try to retrieve the uid and gid owner fields from special sids. This patch adds the code to parse the owner sids in the ACL to see if they match, and if so populate the uid and/or gid from them. This is faster than upcalling for them and asking winbind, and is a fairly common case, and is also helpful when cifs.upcall and idmapping is not configured. Signed-off-by: Steve French <steve.french@primarydata.com> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-10-14CIFS: Add new mount option to set owner uid and gid from special sids in aclSteve French4-1/+11
Add "idsfromsid" mount option to indicate to cifs.ko that it should try to retrieve the uid and gid owner fields from special sids in the ACL if present. This first patch just adds the parsing for the mount option. Signed-off-by: Steve French <steve.french@primarydata.com> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-10-14CIFS: Reset read oplock to NONE if we have mandatory locks after reopenPavel Shilovsky1-0/+9
We are already doing the same thing for an ordinary open case: we can't keep read oplock on a file if we have mandatory byte-range locks because pagereading can conflict with these locks on a server. Fix it by setting oplock level to NONE. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-10-14CIFS: Fix persistent handles re-opening on reconnectPavel Shilovsky2-5/+18
openFileList of tcon can be changed while cifs_reopen_file() is called that can lead to an unexpected behavior when we return to the loop. Fix this by introducing a temp list for keeping all file handles that need to be reopen. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-10-14SMB2: Separate RawNTLMSSP authentication from SMB2_sess_setupSachin Prabhu1-199/+162
We split the rawntlmssp authentication into negotiate and authencate parts. We also clean up the code and add helpers. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-10-14SMB2: Separate Kerberos authentication from SMB2_sess_setupSachin Prabhu1-46/+230
Add helper functions and split Kerberos authentication off SMB2_sess_setup. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2016-10-14Expose cifs module parameters in sysfsGermano Percossi1-3/+3
/sys/module/cifs/parameters should display the three other module load time configuration settings for cifs.ko Signed-off-by: Germano Percossi <germano.percossi@citrix.com> Signed-off-by: Steve French <steve.french@primarydata.com>
2016-10-14Cleanup missing frees on some ioctlsSteve French1-5/+4
Cleanup some missing mem frees on some cifs ioctls, and clarify others to make more obvious that no data is returned. CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Sachin Prabhu <sprabhu@redhat.com>