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2018-09-21scsi: target: iscsi: Use bin2hex instead of a re-implementationVincent Pelletier1-12/+3
Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-09-21scsi: target: iscsi: Use hex2bin instead of a re-implementationVincent Pelletier1-16/+14
This change has the following effects, in order of descreasing importance: 1) Prevent a stack buffer overflow 2) Do not append an unnecessary NULL to an anyway binary buffer, which is writing one byte past client_digest when caller is: chap_string_to_hex(client_digest, chap_r, strlen(chap_r)); The latter was found by KASAN (see below) when input value hes expected size (32 hex chars), and further analysis revealed a stack buffer overflow can happen when network-received value is longer, allowing an unauthenticated remote attacker to smash up to 17 bytes after destination buffer (16 bytes attacker-controlled and one null). As switching to hex2bin requires specifying destination buffer length, and does not internally append any null, it solves both issues. This addresses CVE-2018-14633. Beyond this: - Validate received value length and check hex2bin accepted the input, to log this rejection reason instead of just failing authentication. - Only log received CHAP_R and CHAP_C values once they passed sanity checks. ================================================================== BUG: KASAN: stack-out-of-bounds in chap_string_to_hex+0x32/0x60 [iscsi_target_mod] Write of size 1 at addr ffff8801090ef7c8 by task kworker/0:0/1021 CPU: 0 PID: 1021 Comm: kworker/0:0 Tainted: G O 4.17.8kasan.sess.connops+ #2 Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014 Workqueue: events iscsi_target_do_login_rx [iscsi_target_mod] Call Trace: dump_stack+0x71/0xac print_address_description+0x65/0x22e ? chap_string_to_hex+0x32/0x60 [iscsi_target_mod] kasan_report.cold.6+0x241/0x2fd chap_string_to_hex+0x32/0x60 [iscsi_target_mod] chap_server_compute_md5.isra.2+0x2cb/0x860 [iscsi_target_mod] ? chap_binaryhex_to_asciihex.constprop.5+0x50/0x50 [iscsi_target_mod] ? ftrace_caller_op_ptr+0xe/0xe ? __orc_find+0x6f/0xc0 ? unwind_next_frame+0x231/0x850 ? kthread+0x1a0/0x1c0 ? ret_from_fork+0x35/0x40 ? ret_from_fork+0x35/0x40 ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod] ? deref_stack_reg+0xd0/0xd0 ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod] ? is_module_text_address+0xa/0x11 ? kernel_text_address+0x4c/0x110 ? __save_stack_trace+0x82/0x100 ? ret_from_fork+0x35/0x40 ? save_stack+0x8c/0xb0 ? 0xffffffffc1660000 ? iscsi_target_do_login+0x155/0x8d0 [iscsi_target_mod] ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod] ? process_one_work+0x35c/0x640 ? worker_thread+0x66/0x5d0 ? kthread+0x1a0/0x1c0 ? ret_from_fork+0x35/0x40 ? iscsi_update_param_value+0x80/0x80 [iscsi_target_mod] ? iscsit_release_cmd+0x170/0x170 [iscsi_target_mod] chap_main_loop+0x172/0x570 [iscsi_target_mod] ? chap_server_compute_md5.isra.2+0x860/0x860 [iscsi_target_mod] ? rx_data+0xd6/0x120 [iscsi_target_mod] ? iscsit_print_session_params+0xd0/0xd0 [iscsi_target_mod] ? cyc2ns_read_begin.part.2+0x90/0x90 ? _raw_spin_lock_irqsave+0x25/0x50 ? memcmp+0x45/0x70 iscsi_target_do_login+0x875/0x8d0 [iscsi_target_mod] ? iscsi_target_check_first_request.isra.5+0x1a0/0x1a0 [iscsi_target_mod] ? del_timer+0xe0/0xe0 ? memset+0x1f/0x40 ? flush_sigqueue+0x29/0xd0 iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod] ? iscsi_target_nego_release+0x80/0x80 [iscsi_target_mod] ? iscsi_target_restore_sock_callbacks+0x130/0x130 [iscsi_target_mod] process_one_work+0x35c/0x640 worker_thread+0x66/0x5d0 ? flush_rcu_work+0x40/0x40 kthread+0x1a0/0x1c0 ? kthread_bind+0x30/0x30 ret_from_fork+0x35/0x40 The buggy address belongs to the page: page:ffffea0004243bc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x17fffc000000000() raw: 017fffc000000000 0000000000000000 0000000000000000 00000000ffffffff raw: ffffea0004243c20 ffffea0004243ba0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801090ef680: f2 f2 f2 f2 f2 f2 f2 01 f2 f2 f2 f2 f2 f2 f2 00 ffff8801090ef700: f2 f2 f2 f2 f2 f2 f2 00 02 f2 f2 f2 f2 f2 f2 00 >ffff8801090ef780: 00 f2 f2 f2 f2 f2 f2 00 00 f2 f2 f2 f2 f2 f2 00 ^ ffff8801090ef800: 00 f2 f2 f2 f2 f2 f2 00 00 00 00 02 f2 f2 f2 f2 ffff8801090ef880: f2 f2 f2 00 00 00 00 00 00 00 00 f2 f2 f2 f2 00 ================================================================== Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-09-11scsi: iscsi: target: Don't use stack buffer for scatterlistLaura Abbott1-8/+14
Fedora got a bug report of a crash with iSCSI: kernel BUG at include/linux/scatterlist.h:143! ... RIP: 0010:iscsit_do_crypto_hash_buf+0x154/0x180 [iscsi_target_mod] ... Call Trace: ? iscsi_target_tx_thread+0x200/0x200 [iscsi_target_mod] iscsit_get_rx_pdu+0x4cd/0xa90 [iscsi_target_mod] ? native_sched_clock+0x3e/0xa0 ? iscsi_target_tx_thread+0x200/0x200 [iscsi_target_mod] iscsi_target_rx_thread+0x81/0xf0 [iscsi_target_mod] kthread+0x120/0x140 ? kthread_create_worker_on_cpu+0x70/0x70 ret_from_fork+0x3a/0x50 This is a BUG_ON for using a stack buffer with a scatterlist. There are two cases that trigger this bug. Switch to using a dynamically allocated buffer for one case and do not assign a NULL buffer in another case. Signed-off-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-30scsi: iscsi: target: Fix conn_ops double freeMike Christie3-75/+77
If iscsi_login_init_conn fails it can free conn_ops. __iscsi_target_login_thread will then call iscsi_target_login_sess_out which will also free it. This fixes the problem by organizing conn allocation/setup into parts that are needed through the life of the conn and parts that are only needed for the login. The free functions then release what was allocated in the alloc functions. With this patch we have: iscsit_alloc_conn/iscsit_free_conn - allocs/frees the conn we need for the entire life of the conn. iscsi_login_init_conn/iscsi_target_nego_release - allocs/frees the parts of the conn that are only needed during login. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-30scsi: iscsi: target: Set conn->sess to NULL when iscsi_login_set_conn_values failsVincent Pelletier1-5/+3
Fixes a use-after-free reported by KASAN when later iscsi_target_login_sess_out gets called and it tries to access conn->sess->se_sess: Disabling lock debugging due to kernel taint iSCSI Login timeout on Network Portal [::]:3260 iSCSI Login negotiation failed. ================================================================== BUG: KASAN: use-after-free in iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] Read of size 8 at addr ffff880109d070c8 by task iscsi_np/980 CPU: 1 PID: 980 Comm: iscsi_np Tainted: G O 4.17.8kasan.sess.connops+ #4 Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014 Call Trace: dump_stack+0x71/0xac print_address_description+0x65/0x22e ? iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] kasan_report.cold.6+0x241/0x2fd iscsi_target_login_sess_out.cold.12+0x58/0xff [iscsi_target_mod] iscsi_target_login_thread+0x1086/0x1710 [iscsi_target_mod] ? __sched_text_start+0x8/0x8 ? iscsi_target_login_sess_out+0x250/0x250 [iscsi_target_mod] ? __kthread_parkme+0xcc/0x100 ? parse_args.cold.14+0xd3/0xd3 ? iscsi_target_login_sess_out+0x250/0x250 [iscsi_target_mod] kthread+0x1a0/0x1c0 ? kthread_bind+0x30/0x30 ret_from_fork+0x35/0x40 Allocated by task 980: kasan_kmalloc+0xbf/0xe0 kmem_cache_alloc_trace+0x112/0x210 iscsi_target_login_thread+0x816/0x1710 [iscsi_target_mod] kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Freed by task 980: __kasan_slab_free+0x125/0x170 kfree+0x90/0x1d0 iscsi_target_login_thread+0x1577/0x1710 [iscsi_target_mod] kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 The buggy address belongs to the object at ffff880109d06f00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 456 bytes inside of 512-byte region [ffff880109d06f00, ffff880109d07100) The buggy address belongs to the page: page:ffffea0004274180 count:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 flags: 0x17fffc000008100(slab|head) raw: 017fffc000008100 0000000000000000 0000000000000000 00000001000c000c raw: dead000000000100 dead000000000200 ffff88011b002e00 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880109d06f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880109d07000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880109d07080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880109d07100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880109d07180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com> [rebased against idr/ida changes and to handle ret review comments from Matthew] Signed-off-by: Mike Christie <mchristi@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Reviewed-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-27scsi: target: iscsi: cxgbit: use pr_debug() instead of pr_info()Varun Prakash1-4/+4
DDP programming happens in data path and it can fail because of lack of resources so use pr_debug() instead of pr_info() for this case. Signed-off-by: Varun Prakash <varun@chelsio.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-26Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-daxLinus Torvalds3-34/+21
Pull IDA updates from Matthew Wilcox: "A better IDA API: id = ida_alloc(ida, GFP_xxx); ida_free(ida, id); rather than the cumbersome ida_simple_get(), ida_simple_remove(). The new IDA API is similar to ida_simple_get() but better named. The internal restructuring of the IDA code removes the bitmap preallocation nonsense. I hope the net -200 lines of code is convincing" * 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax: (29 commits) ida: Change ida_get_new_above to return the id ida: Remove old API test_ida: check_ida_destroy and check_ida_alloc test_ida: Convert check_ida_conv to new API test_ida: Move ida_check_max test_ida: Move ida_check_leaf idr-test: Convert ida_check_nomem to new API ida: Start new test_ida module target/iscsi: Allocate session IDs from an IDA iscsi target: fix session creation failure handling drm/vmwgfx: Convert to new IDA API dmaengine: Convert to new IDA API ppc: Convert vas ID allocation to new IDA API media: Convert entity ID allocation to new IDA API ppc: Convert mmu context allocation to new IDA API Convert net_namespace to new IDA API cb710: Convert to new IDA API rsxx: Convert to new IDA API osd: Convert to new IDA API sd: Convert to new IDA API ...
2018-08-21target/iscsi: Allocate session IDs from an IDAMatthew Wilcox3-30/+10
Since the session is never looked up by ID, we can use the more space-efficient IDA instead of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21iscsi target: fix session creation failure handlingMike Christie1-14/+21
The problem is that iscsi_login_zero_tsih_s1 sets conn->sess early in iscsi_login_set_conn_values. If the function fails later like when we alloc the idr it does kfree(sess) and leaves the conn->sess pointer set. iscsi_login_zero_tsih_s1 then returns -Exyz and we then call iscsi_target_login_sess_out and access the freed memory. This patch has iscsi_login_zero_tsih_s1 either completely setup the session or completely tear it down, so later in iscsi_target_login_sess_out we can just check for it being set to the connection. Cc: stable@vger.kernel.org Fixes: 0957627a9960 ("iscsi-target: Fix sess allocation leak in...") Signed-off-by: Mike Christie <mchristi@redhat.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds20-433/+508
Pull SCSI updates from James Bottomley: "This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx, hisi_sas, smartpqi, megaraid_sas, arcmsr. In addition, with the continuing absence of Nic we have target updates for tcmu and target core (all with reviews and acks). The biggest observable change is going to be that we're (again) trying to switch to mulitqueue as the default (a user can still override the setting on the kernel command line). Other major core stuff is the removal of the remaining Microchannel drivers, an update of the internal timers and some reworks of completion and result handling" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (203 commits) scsi: core: use blk_mq_run_hw_queues in scsi_kick_queue scsi: ufs: remove unnecessary query(DM) UPIU trace scsi: qla2xxx: Fix issue reported by static checker for qla2x00_els_dcmd2_sp_done() scsi: aacraid: Spelling fix in comment scsi: mpt3sas: Fix calltrace observed while running IO & reset scsi: aic94xx: fix an error code in aic94xx_init() scsi: st: remove redundant pointer STbuffer scsi: qla2xxx: Update driver version to 10.00.00.08-k scsi: qla2xxx: Migrate NVME N2N handling into state machine scsi: qla2xxx: Save frame payload size from ICB scsi: qla2xxx: Fix stalled relogin scsi: qla2xxx: Fix race between switch cmd completion and timeout scsi: qla2xxx: Fix Management Server NPort handle reservation logic scsi: qla2xxx: Flush mailbox commands on chip reset scsi: qla2xxx: Fix unintended Logout scsi: qla2xxx: Fix session state stuck in Get Port DB scsi: qla2xxx: Fix redundant fc_rport registration scsi: qla2xxx: Silent erroneous message scsi: qla2xxx: Prevent sysfs access when chip is down scsi: qla2xxx: Add longer window for chip reset ...
2018-08-14Merge tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-blockLinus Torvalds2-2/+4
Pull block updates from Jens Axboe: "First pull request for this merge window, there will also be a followup request with some stragglers. This pull request contains: - Fix for a thundering heard issue in the wbt block code (Anchal Agarwal) - A few NVMe pull requests: * Improved tracepoints (Keith) * Larger inline data support for RDMA (Steve Wise) * RDMA setup/teardown fixes (Sagi) * Effects log suppor for NVMe target (Chaitanya Kulkarni) * Buffered IO suppor for NVMe target (Chaitanya Kulkarni) * TP4004 (ANA) support (Christoph) * Various NVMe fixes - Block io-latency controller support. Much needed support for properly containing block devices. (Josef) - Series improving how we handle sense information on the stack (Kees) - Lightnvm fixes and updates/improvements (Mathias/Javier et al) - Zoned device support for null_blk (Matias) - AIX partition fixes (Mauricio Faria de Oliveira) - DIF checksum code made generic (Max Gurtovoy) - Add support for discard in iostats (Michael Callahan / Tejun) - Set of updates for BFQ (Paolo) - Removal of async write support for bsg (Christoph) - Bio page dirtying and clone fixups (Christoph) - Set of bcache fix/changes (via Coly) - Series improving blk-mq queue setup/teardown speed (Ming) - Series improving merging performance on blk-mq (Ming) - Lots of other fixes and cleanups from a slew of folks" * tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block: (190 commits) blkcg: Make blkg_root_lookup() work for queues in bypass mode bcache: fix error setting writeback_rate through sysfs interface null_blk: add lock drop/acquire annotation Blk-throttle: reduce tail io latency when iops limit is enforced block: paride: pd: mark expected switch fall-throughs block: Ensure that a request queue is dissociated from the cgroup controller block: Introduce blk_exit_queue() blkcg: Introduce blkg_root_lookup() block: Remove two superfluous #include directives blk-mq: count the hctx as active before allocating tag block: bvec_nr_vecs() returns value for wrong slab bcache: trivial - remove tailing backslash in macro BTREE_FLAG bcache: make the pr_err statement used for ENOENT only in sysfs_attatch section bcache: set max writeback rate when I/O request is idle bcache: add code comments for bset.c bcache: fix mistaken comments in request.c bcache: fix mistaken code comments in bcache.h bcache: add a comment in super.c bcache: avoid unncessary cache prefetch bch_btree_node_get() bcache: display rate debug parameters to 0 when writeback is not running ...
2018-08-07target/loop: depend on SCSIChristoph Hellwig1-0/+1
The target loopback driver is a low-level driver for the SCSI subsystem, and as such needs to depend on it. Fixes: 8a39a047 ("target: don't depend on SCSI") Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-02target: don't depend on SCSIChristoph Hellwig1-2/+3
The core target code only needs code from scsi_common.c, which is now separately selectable. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-02scsi: target: loop, usb, vhost, xen: use target_remove_sessionMike Christie1-1/+1
This converts drivers that were only calling transport_deregister_session to use target_remove_session. The calling of transport_deregister_session_configfs via target_remove_session for these types of drivers is ok, because they were not exporting info from fields like sess_acl_list, sess->se_tpg and sess->fabric_sess_ptr from configfs accessible functions, so they will see no difference. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Felipe Balbi <balbi@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Juergen Gross <jgross@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: tcm_fc: use target_remove_sessionMike Christie1-2/+1
This converts tcm_fc to use target_remove_session tcm_fc was calling transport_deregister_session_configfs then calling transport_deregister_session when commands have completed. It should be ok for it to call transport_deregister_session_configfs later via target_remove_session because transport_deregister_session_configfs only prevents access from configfs via tpg removal and its call to the close_session callback for that driver, and this is already protected by the ft_lport_lock and its port lookup handling. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Johannes Thumshirn <jth@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: target: srp, vscsi, sbp, qla: use target_remove_sessionMike Christie1-2/+1
This converts the drivers that called transport_deregister_session_configfs and then immediately called transport_deregister_session to use target_remove_session. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Chris Boot <bootc@bootc.net> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Cc: Michael Cyr <mikecyr@linux.vnet.ibm.com> Cc: <qla2xxx-upstream@qlogic.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: target: add session removal functionMike Christie1-0/+7
This adds a function to remove a session which should be used by drivers that use target_setup_session. The next patches will convert the target drivers to use this new function. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Chris Boot <bootc@bootc.net> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Cc: Michael Cyr <mikecyr@linux.vnet.ibm.com> Cc: <qla2xxx-upstream@qlogic.com> Cc: Johannes Thumshirn <jth@kernel.org> Cc: Felipe Balbi <balbi@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Juergen Gross <jgross@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: target: rename target_alloc_sessionMike Christie4-5/+5
Rename target_alloc_session to target_setup_session to avoid confusion with the other transport session allocation function that only allocates the session and because the target_alloc_session does so much more. It allocates the session, sets up the nacl and registers the session. The next patch will then add a remove function to match the setup in this one, so it should make sense for all drivers, except iscsi, to just call those 2 functions to setup and remove a session. iscsi will continue to be the odd driver. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Chris Boot <bootc@bootc.net> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Cc: Michael Cyr <mikecyr@linux.vnet.ibm.com> Cc: <qla2xxx-upstream@qlogic.com> Cc: Johannes Thumshirn <jth@kernel.org> Cc: Felipe Balbi <balbi@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Juergen Gross <jgross@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: target: make transport_init_session_tags staticMike Christie1-4/+3
transport_init_session_tags is only called from target_core_transport.c so make it static. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: iscsi target: have iscsit_start_nopin_timer call __iscsit_start_nopin_timerMike Christie1-19/+1
Just have iscsit_start_nopin_timer grab the lock and call __iscsit_start_nopin_timer. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-08-02scsi: target: fix __transport_register_session lockingMike Christie1-2/+3
When __transport_register_session is called from transport_register_session irqs will already have been disabled, so we do not want the unlock irq call to enable them until the higher level has done the final spin_unlock_irqrestore/ spin_unlock_irq. This has __transport_register_session use the save/restore call. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30Revert "scsi: target/iscsi: Reduce number of __iscsit_free_cmd() callers"Bart Van Assche3-2/+5
The cxgbit driver expects that __iscsit_free_cmd() is called before the target core frees the command page list. Since this patch breaks the cxgbit driver, revert it. Reported-by: Varun Prakash <varun@chelsio.com> Fixes: ed88f055788a ("scsi: target/iscsi: Reduce number of __iscsit_free_cmd() callers") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Varun Prakash <varun@chelsio.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: use u64 for dev_sizeMike Christie1-13/+8
We use unsigned long, size_t and u64 for dev_size. This has us standardize on u64. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: use match_int for dev paramsMike Christie1-23/+14
Instead of doing strdup and kstrto* just use match_int for dev params. It will be ok to use int instead of unsigned long in tcmu_set_dev_attrib because that is only being used for max sectors and block size and the supported values for them are well under the max possible integer value. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: do not set max_blocks if data_bitmap has been setupMike Christie1-33/+40
This patch prevents a bug where data_bitmap is allocated in tcmu_configure_device, userspace changes the max_blocks setting, the device is mapped to a LUN, then we try to access the data_bitmap based on the new max_blocks limit which may now be out of range. To prevent this, we just check if data_bitmap has been setup. If it has then we fail the max_blocks update operation. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: unmap if dev is configuredMike Christie1-0/+5
The tcmu dev is added to the list of tcmu devices during configuration. At this time the tcmu setup has completed, but lio core has not completed its setup. The device is not yet usable so do not try to unmap blocks from it Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: check if dev is configured before block/resetMike Christie1-0/+10
Do not allow userspace to block or reset the ring until the device has been configured. This will prevent the bug where userspace can write to those files and access mb_addr before it has been setup. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: use lio core se_device configuration helperMike Christie1-8/+3
Use the lio core helper to check if the device is configured. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: target: add helper to check if dev is configuredMike Christie3-8/+9
This just adds a helper function to check if a device is configured and it converts the target users to use it. The next patch will add a backend module user so those types of modules do not have to know the lio core details. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: tcmu: initialize list headMike Christie1-0/+1
Use INIT_LIST_HEAD to initialize node list head. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-30scsi: target_core_user: fix double unlockMike Christie1-1/+0
The caller of queue_cmd_ring grabs and releases the lock, so the tcmu_setup_cmd_timer failure handling inside queue_cmd_ring should not call mutex_unlock. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-12scsi: target: iscsi: cxgbit: fix max iso npdu calculationVarun Prakash1-7/+9
- rounddown CXGBIT_MAX_ISO_PAYLOAD by csk->emss before calculating max_iso_npdu to get max TCP payload in multiple of mss. - call cxgbit_set_digest() before cxgbit_set_iso_npdu() to set csk->submode, it is used in calculating number of iso pdus. Signed-off-by: Varun Prakash <varun@chelsio.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Remove se_dev_entry.ua_countBart Van Assche2-11/+2
se_dev_entry.ua_count is only used to check whether or not se_dev_entry.ua_list is empty. Use list_empty_careful() instead. Checking whether or not ua_list is empty without holding the lock that protects that list is fine because the code that dequeues from that list will check again whether or not that list is empty. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Fix handling of removed LUNsBart Van Assche3-18/+39
Send a valid ASC / ASCQ combination back to the initiator if a SCSI command is received after a LUN has been removed. This patch fixes the following call trace: WARNING: CPU: 0 PID: 4 at drivers/target/target_core_transport.c:3131 translate_sense_reason+0x164/0x190 [target_core_mod] Workqueue: ib-comp-wq ib_cq_poll_work [ib_core] RIP: 0010:translate_sense_reason+0x164/0x190 [target_core_mod] Call Trace: transport_send_check_condition_and_sense+0x95/0x1c0 [target_core_mod] transport_generic_request_failure+0x102/0x270 [target_core_mod] transport_generic_new_cmd+0x138/0x340 [target_core_mod] transport_handle_cdb_direct+0x2f/0x80 [target_core_mod] target_submit_cmd_map_sgls+0x212/0x2a0 [target_core_mod] srpt_handle_new_iu+0x244/0x680 [ib_srpt] __ib_process_cq+0x6d/0xc0 [ib_core] ib_cq_poll_work+0x18/0x50 [ib_core] process_one_work+0x20b/0x6a0 worker_thread+0x35/0x380 kthread+0x117/0x130 ret_from_fork+0x24/0x30 Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Send unit attention condition even if the sense buffer is too smallBart Van Assche1-14/+7
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Do not duplicate the code that marks that a command has sense dataBart Van Assche1-6/+3
This patch does not change any functionality. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target/tcm_loop: Avoid that static checkers warn about dead codeBart Van Assche1-4/+1
The code under the "release:" label can only be reached after se_cmd has been set to a non-NULL value. Hence remove the if (se_cmd) test. Keep the else-part since calling transport_generic_free_cmd() is not necessary for a command that has not been submitted to the core. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 4d3895d5ea43 ("target/tcm_loop: Merge struct tcm_loop_cmd and struct tcm_loop_tmr") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Remove second argument from fabric_make_tpg()Bart Van Assche5-17/+8
Since most target drivers do not use the second fabric_make_tpg() argument ("group") and since it is trivial to derive the group pointer from the wwn pointer, do not pass the group pointer to fabric_make_tpg(). Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Felipe Balbi <felipe.balbi@linux.intel.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target/iscsi: Make iscsit_ta_authentication() respect the output buffer sizeBart Van Assche1-2/+1
Fixes: e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target/iscsi: Reduce number of __iscsit_free_cmd() callersBart Van Assche3-5/+2
Instead of calling __iscsit_free_cmd() from inside iscsit_aborted_task() if a command has been aborted and from inside iscsit_free_cmd() if a command has not been aborted, call __iscsit_free_cmd() from inside lio_release_cmd(). The latter function is namely called for all commands once the reference count has dropped to zero. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Varun Prakash <varun@chelsio.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Simplify the code for waiting for command completionBart Van Assche1-16/+8
Instead of embedding the completion that is used for waiting for command completion in struct se_cmd, let the context that waits for command completion allocate it. This makes it possible to have a single code path for non-aborted and aborted commands in target_release_cmd_kref() and avoids that transport_generic_free_cmd() has to call cmd->se_tfo->release_cmd() directly. This patch does not change any functionality. Note: transport_generic_free_cmd() only waits until the se_cmd reference count has reached zero after it has set both CMD_T_FABRIC_STOP and CMD_T_ABORTED. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Simplify transport_generic_free_cmd() (2/2)Bart Van Assche1-6/+4
Since target_wait_free_cmd() skips TMFs with no associated LUN, it is safe to call that function for such commands. Use this to simplify transport_generic_free_cmd(). The only functional change in this patch is that CMD_T_FABRIC_STOP gets set for TMFs with no associated LUN by transport_generic_free_cmd(). Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Simplify transport_generic_free_cmd() (1/2)Bart Van Assche1-6/+2
Move identical code outside an if/else statement. This patch does not change any functionality. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Fold core_tmr_handle_tas_abort() into transport_cmd_finish_abort()Bart Van Assche3-17/+11
For the two calls to transport_cmd_finish_abort() outside core_tmr_handle_tas_abort() it is guaranteed that CMD_T_TAS is not set. Use this property to fold core_tmr_handle_tas_abort() into transport_cmd_finish_abort(). This patch does not change any functionality. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Simplify core_tmr_handle_tas_abort()Bart Van Assche1-12/+3
The code that can set CMD_T_TAS is executed by the same thread as the thread that executes core_tmr_handle_tas_abort(). That means that no locking is needed to check CMD_T_TAS from inside core_tmr_handle_tas_abort(). This patch does not change any functionality. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Document when CMD_T_STOP and CMD_T_COMPLETE are setBart Van Assche1-6/+28
Document those aspects of transport_cmd_check_stop_to_fabric() and transport_generic_free_cmd() of which it is nontrivial to derive these from their implementation. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Make the session shutdown code also wait for commands that are being abortedBart Van Assche2-59/+23
Target drivers must call target_sess_cmd_list_set_waiting() and target_wait_for_sess_cmds() before freeing a session. Since freeing a session is only safe after all commands that are associated with a session have finished, make target_wait_for_sess_cmds() also wait for commands that are being aborted. Instead of setting a flag in each pending command from target_sess_cmd_list_set_waiting() and waiting in target_wait_for_sess_cmds() on a per-command completion, only set a per-session flag in the former function and wait on a per-session completion in the latter function. This change is safe because once a SCSI initiator system has submitted a command a target system is always allowed to execute it to completion. See also commit 0f4a943168f3 ("target: Fix remote-port TMR ABORT + se_cmd fabric stop"). This patch is based on the following two patches: * Bart Van Assche, target: Simplify session shutdown code, February 19, 2015 (https://github.com/bvanassche/linux/commit/8df5463d7d7619f2f1b70cfe5172eaef0aa52815). * Christoph Hellwig, target: Rework session shutdown code, December 7, 2015 (http://thread.gmane.org/gmane.linux.scsi.target.devel/10695). Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Introduce transport_init_session()Bart Van Assche2-9/+18
Other than initializing xcopy_pt_sess.sess_wait_list, this patch does not change any functionality. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Rename transport_init_session() into transport_alloc_session()Bart Van Assche2-5/+23
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-07-02scsi: target: Move a list_del_init() statementBart Van Assche1-2/+1
This patch does not change any functionality but makes the next patch easier to read. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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