Commit dac37e15 authored by Benjamin Block's avatar Benjamin Block Committed by Martin K. Petersen

scsi: zfcp: fix use-after-"free" in FC ingress path after TMF

When SCSI EH invokes zFCP's callbacks for eh_device_reset_handler() and
eh_target_reset_handler(), it expects us to relent the ownership over
the given scsi_cmnd and all other scsi_cmnds within the same scope - LUN
or target - when returning with SUCCESS from the callback ('release'
them).  SCSI EH can then reuse those commands.

We did not follow this rule to release commands upon SUCCESS; and if
later a reply arrived for one of those supposed to be released commands,
we would still make use of the scsi_cmnd in our ingress tasklet. This
will at least result in undefined behavior or a kernel panic because of
a wrong kernel pointer dereference.

To fix this, we NULLify all pointers to scsi_cmnds (struct zfcp_fsf_req
*)->data in the matching scope if a TMF was successful. This is done
under the locks (struct zfcp_adapter *)->abort_lock and (struct
zfcp_reqlist *)->lock to prevent the requests from being removed from
the request-hashtable, and the ingress tasklet from making use of the
scsi_cmnd-pointer in zfcp_fsf_fcp_cmnd_handler().

For cases where a reply arrives during SCSI EH, but before we get a
chance to NULLify the pointer - but before we return from the callback
-, we assume that the code is protected from races via the CAS operation
in blk_complete_request() that is called in scsi_done().

The following stacktrace shows an example for a crash resulting from the
previous behavior:

Unable to handle kernel pointer dereference at virtual kernel address fffffee17a672000
Oops: 0038 [#1] SMP
CPU: 2 PID: 0 Comm: swapper/2 Not tainted
task: 00000003f7ff5be0 ti: 00000003f3d38000 task.ti: 00000003f3d38000
Krnl PSW : 0404d00180000000 00000000001156b0 (smp_vcpu_scheduled+0x18/0x40)
           R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 EA:3
Krnl GPRS: 000000200000007e 0000000000000000 fffffee17a671fd8 0000000300000015
           ffffffff80000000 00000000005dfde8 07000003f7f80e00 000000004fa4e800
           000000036ce8d8f8 000000036ce8d9c0 00000003ece8fe00 ffffffff969c9e93
           00000003fffffffd 000000036ce8da10 00000000003bf134 00000003f3b07918
Krnl Code: 00000000001156a2: a7190000        lghi    %r1,0
           00000000001156a6: a7380015        lhi    %r3,21
          #00000000001156aa: e32050000008    ag    %r2,0(%r5)
          >00000000001156b0: 482022b0        lh    %r2,688(%r2)
           00000000001156b4: ae123000        sigp    %r1,%r2,0(%r3)
           00000000001156b8: b2220020        ipm    %r2
           00000000001156bc: 8820001c        srl    %r2,28
           00000000001156c0: c02700000001    xilf    %r2,1
Call Trace:
([<0000000000000000>] 0x0)
 [<000003ff807bdb8e>] zfcp_fsf_fcp_cmnd_handler+0x3de/0x490 [zfcp]
 [<000003ff807be30a>] zfcp_fsf_req_complete+0x252/0x800 [zfcp]
 [<000003ff807c0a48>] zfcp_fsf_reqid_check+0xe8/0x190 [zfcp]
 [<000003ff807c194e>] zfcp_qdio_int_resp+0x66/0x188 [zfcp]
 [<000003ff80440c64>] qdio_kick_handler+0xdc/0x310 [qdio]
 [<000003ff804463d0>] __tiqdio_inbound_processing+0xf8/0xcd8 [qdio]
 [<0000000000141fd4>] tasklet_action+0x9c/0x170
 [<0000000000141550>] __do_softirq+0xe8/0x258
 [<000000000010ce0a>] do_softirq+0xba/0xc0
 [<000000000014187c>] irq_exit+0xc4/0xe8
 [<000000000046b526>] do_IRQ+0x146/0x1d8
 [<00000000005d6a3c>] io_return+0x0/0x8
 [<00000000005d6422>] vtime_stop_cpu+0x4a/0xa0
([<0000000000000000>] 0x0)
 [<0000000000103d8a>] arch_cpu_idle+0xa2/0xb0
 [<0000000000197f94>] cpu_startup_entry+0x13c/0x1f8
 [<0000000000114782>] smp_start_secondary+0xda/0xe8
 [<00000000005d6efe>] restart_int_handler+0x56/0x6c
 [<0000000000000000>] 0x0
Last Breaking-Event-Address:
 [<00000000003bf12e>] arch_spin_lock_wait+0x56/0xb0
Suggested-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
Fixes: ea127f97 ("[PATCH] s390 (7/7): zfcp host adapter.") (tglx/history.git)
Cc: <stable@vger.kernel.org> #2.6.32+
Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 165ae50e
......@@ -388,4 +388,15 @@ void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag)
_zfcp_dbf_scsi(tmp_tag, 1, scmnd, NULL);
}
/**
* zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
* @scmnd: SCSI command that was NULLified.
* @fsf_req: request that owned @scmnd.
*/
static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
struct zfcp_fsf_req *fsf_req)
{
_zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
}
#endif /* ZFCP_DBF_H */
......@@ -4,7 +4,7 @@
* Data structure and helper functions for tracking pending FSF
* requests.
*
* Copyright IBM Corp. 2009
* Copyright IBM Corp. 2009, 2016
*/
#ifndef ZFCP_REQLIST_H
......@@ -180,4 +180,32 @@ static inline void zfcp_reqlist_move(struct zfcp_reqlist *rl,
spin_unlock_irqrestore(&rl->lock, flags);
}
/**
* zfcp_reqlist_apply_for_all() - apply a function to every request.
* @rl: the requestlist that contains the target requests.
* @f: the function to apply to each request; the first parameter of the
* function will be the target-request; the second parameter is the same
* pointer as given with the argument @data.
* @data: freely chosen argument; passed through to @f as second parameter.
*
* Uses :c:macro:`list_for_each_entry` to iterate over the lists in the hash-
* table (not a 'safe' variant, so don't modify the list).
*
* Holds @rl->lock over the entire request-iteration.
*/
static inline void
zfcp_reqlist_apply_for_all(struct zfcp_reqlist *rl,
void (*f)(struct zfcp_fsf_req *, void *), void *data)
{
struct zfcp_fsf_req *req;
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&rl->lock, flags);
for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
list_for_each_entry(req, &rl->buckets[i], list)
f(req, data);
spin_unlock_irqrestore(&rl->lock, flags);
}
#endif /* ZFCP_REQLIST_H */
......@@ -3,7 +3,7 @@
*
* Interface to Linux SCSI midlayer.
*
* Copyright IBM Corp. 2002, 2015
* Copyright IBM Corp. 2002, 2016
*/
#define KMSG_COMPONENT "zfcp"
......@@ -209,6 +209,57 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
return retval;
}
struct zfcp_scsi_req_filter {
u8 tmf_scope;
u32 lun_handle;
u32 port_handle;
};
static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
{
struct zfcp_scsi_req_filter *filter =
(struct zfcp_scsi_req_filter *)data;
/* already aborted - prevent side-effects - or not a SCSI command */
if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
return;
/* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
if (old_req->qtcb->header.port_handle != filter->port_handle)
return;
if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
old_req->qtcb->header.lun_handle != filter->lun_handle)
return;
zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
old_req->data = NULL;
}
static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
{
struct zfcp_adapter *adapter = zsdev->port->adapter;
struct zfcp_scsi_req_filter filter = {
.tmf_scope = FCP_TMF_TGT_RESET,
.port_handle = zsdev->port->handle,
};
unsigned long flags;
if (tm_flags == FCP_TMF_LUN_RESET) {
filter.tmf_scope = FCP_TMF_LUN_RESET;
filter.lun_handle = zsdev->lun_handle;
}
/*
* abort_lock secures against other processings - in the abort-function
* and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
*/
write_lock_irqsave(&adapter->abort_lock, flags);
zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
&filter);
write_unlock_irqrestore(&adapter->abort_lock, flags);
}
static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
......@@ -241,8 +292,10 @@ static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
retval = FAILED;
} else
} else {
zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
}
zfcp_fsf_req_free(fsf_req);
return retval;
......
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