License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 08:07:57 -06:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2010-02-17 03:18:50 -07:00
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/*
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* zfcp device driver
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*
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* Data structure and helper functions for tracking pending FSF
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* requests.
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*
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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: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Fixes: ea127f9754 ("[PATCH] s390 (7/7): zfcp host adapter.") (tglx/history.git)
Cc: <stable@vger.kernel.org> #2.6.32+
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-12-09 09:16:31 -07:00
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* Copyright IBM Corp. 2009, 2016
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2010-02-17 03:18:50 -07:00
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*/
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#ifndef ZFCP_REQLIST_H
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#define ZFCP_REQLIST_H
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/* number of hash buckets */
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#define ZFCP_REQ_LIST_BUCKETS 128
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/**
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* struct zfcp_reqlist - Container for request list (reqlist)
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* @lock: Spinlock for protecting the hash list
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* @list: Array of hashbuckets, each is a list of requests in this bucket
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*/
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struct zfcp_reqlist {
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spinlock_t lock;
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struct list_head buckets[ZFCP_REQ_LIST_BUCKETS];
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};
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static inline int zfcp_reqlist_hash(unsigned long req_id)
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{
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return req_id % ZFCP_REQ_LIST_BUCKETS;
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}
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/**
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* zfcp_reqlist_alloc - Allocate and initialize reqlist
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*
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* Returns pointer to allocated reqlist on success, or NULL on
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* allocation failure.
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*/
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static inline struct zfcp_reqlist *zfcp_reqlist_alloc(void)
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{
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unsigned int i;
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struct zfcp_reqlist *rl;
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rl = kzalloc(sizeof(struct zfcp_reqlist), GFP_KERNEL);
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if (!rl)
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return NULL;
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spin_lock_init(&rl->lock);
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for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
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INIT_LIST_HEAD(&rl->buckets[i]);
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return rl;
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}
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/**
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* zfcp_reqlist_isempty - Check whether the request list empty
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* @rl: pointer to reqlist
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*
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* Returns: 1 if list is empty, 0 if not
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*/
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static inline int zfcp_reqlist_isempty(struct zfcp_reqlist *rl)
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{
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unsigned int i;
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for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
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if (!list_empty(&rl->buckets[i]))
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return 0;
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return 1;
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}
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/**
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* zfcp_reqlist_free - Free allocated memory for reqlist
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* @rl: The reqlist where to free memory
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*/
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static inline void zfcp_reqlist_free(struct zfcp_reqlist *rl)
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{
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/* sanity check */
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BUG_ON(!zfcp_reqlist_isempty(rl));
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kfree(rl);
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}
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static inline struct zfcp_fsf_req *
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_zfcp_reqlist_find(struct zfcp_reqlist *rl, unsigned long req_id)
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{
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struct zfcp_fsf_req *req;
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unsigned int i;
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i = zfcp_reqlist_hash(req_id);
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list_for_each_entry(req, &rl->buckets[i], list)
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if (req->req_id == req_id)
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return req;
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return NULL;
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}
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/**
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* zfcp_reqlist_find - Lookup FSF request by its request id
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* @rl: The reqlist where to lookup the FSF request
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* @req_id: The request id to look for
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*
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* Returns a pointer to the FSF request with the specified request id
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* or NULL if there is no known FSF request with this id.
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*/
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static inline struct zfcp_fsf_req *
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zfcp_reqlist_find(struct zfcp_reqlist *rl, unsigned long req_id)
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{
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unsigned long flags;
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struct zfcp_fsf_req *req;
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spin_lock_irqsave(&rl->lock, flags);
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req = _zfcp_reqlist_find(rl, req_id);
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spin_unlock_irqrestore(&rl->lock, flags);
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return req;
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}
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/**
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* zfcp_reqlist_find_rm - Lookup request by id and remove it from reqlist
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* @rl: reqlist where to search and remove entry
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* @req_id: The request id of the request to look for
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*
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* This functions tries to find the FSF request with the specified
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* id and then removes it from the reqlist. The reqlist lock is held
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* during both steps of the operation.
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*
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* Returns: Pointer to the FSF request if the request has been found,
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* NULL if it has not been found.
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*/
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static inline struct zfcp_fsf_req *
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zfcp_reqlist_find_rm(struct zfcp_reqlist *rl, unsigned long req_id)
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{
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unsigned long flags;
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struct zfcp_fsf_req *req;
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spin_lock_irqsave(&rl->lock, flags);
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req = _zfcp_reqlist_find(rl, req_id);
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if (req)
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list_del(&req->list);
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spin_unlock_irqrestore(&rl->lock, flags);
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return req;
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}
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/**
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* zfcp_reqlist_add - Add entry to reqlist
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* @rl: reqlist where to add the entry
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* @req: The entry to add
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*
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* The request id always increases. As an optimization new requests
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* are added here with list_add_tail at the end of the bucket lists
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* while old requests are looked up starting at the beginning of the
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* lists.
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*/
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static inline void zfcp_reqlist_add(struct zfcp_reqlist *rl,
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struct zfcp_fsf_req *req)
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{
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unsigned int i;
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unsigned long flags;
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i = zfcp_reqlist_hash(req->req_id);
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spin_lock_irqsave(&rl->lock, flags);
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list_add_tail(&req->list, &rl->buckets[i]);
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spin_unlock_irqrestore(&rl->lock, flags);
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}
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/**
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* zfcp_reqlist_move - Move all entries from reqlist to simple list
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* @rl: The zfcp_reqlist where to remove all entries
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* @list: The list where to move all entries
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*/
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static inline void zfcp_reqlist_move(struct zfcp_reqlist *rl,
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struct list_head *list)
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{
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unsigned int i;
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unsigned long flags;
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spin_lock_irqsave(&rl->lock, flags);
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for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
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list_splice_init(&rl->buckets[i], list);
|
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spin_unlock_irqrestore(&rl->lock, flags);
|
|
|
|
}
|
|
|
|
|
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: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Fixes: ea127f9754 ("[PATCH] s390 (7/7): zfcp host adapter.") (tglx/history.git)
Cc: <stable@vger.kernel.org> #2.6.32+
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-12-09 09:16:31 -07:00
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/**
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* zfcp_reqlist_apply_for_all() - apply a function to every request.
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* @rl: the requestlist that contains the target requests.
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* @f: the function to apply to each request; the first parameter of the
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* function will be the target-request; the second parameter is the same
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* pointer as given with the argument @data.
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* @data: freely chosen argument; passed through to @f as second parameter.
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*
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* Uses :c:macro:`list_for_each_entry` to iterate over the lists in the hash-
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* table (not a 'safe' variant, so don't modify the list).
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*
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* Holds @rl->lock over the entire request-iteration.
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*/
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static inline void
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zfcp_reqlist_apply_for_all(struct zfcp_reqlist *rl,
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void (*f)(struct zfcp_fsf_req *, void *), void *data)
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{
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struct zfcp_fsf_req *req;
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unsigned long flags;
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unsigned int i;
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spin_lock_irqsave(&rl->lock, flags);
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for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++)
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list_for_each_entry(req, &rl->buckets[i], list)
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f(req, data);
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spin_unlock_irqrestore(&rl->lock, flags);
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}
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2010-02-17 03:18:50 -07:00
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#endif /* ZFCP_REQLIST_H */
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