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>

49 files changed, 49 insertions, 0 deletions

diff --git a/security/Makefile b/security/Makefile
index f2d71cd..4d2d378 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the kernel security code
 #
diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile
index dafdd38..e7ff218 100644
--- a/security/apparmor/Makefile
+++ b/security/apparmor/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Makefile for AppArmor Linux Security Module
 #
 obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 03c1652..5ef7e52 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * device_cgroup.c - device cgroup subsystem
  *
diff --git a/security/integrity/Makefile b/security/integrity/Makefile
index 8d1f4bf..04d6e46 100644
--- a/security/integrity/Makefile
+++ b/security/integrity/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for caching inode integrity data (iint)
 #
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index 29f198b..d921dc4 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for building Trusted Computing Group's(TCG) runtime Integrity
 # Measurement Architecture(IMA).
diff --git a/security/keys/Makefile b/security/keys/Makefile
index 57dff0c..ef1581b 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for key management
 #
diff --git a/security/keys/encrypted-keys/Makefile b/security/keys/encrypted-keys/Makefile
index d6f8433..7a44dce 100644
--- a/security/keys/encrypted-keys/Makefile
+++ b/security/keys/encrypted-keys/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for encrypted keys
 #
diff --git a/security/keys/encrypted-keys/encrypted.h b/security/keys/encrypted-keys/encrypted.h
index 47802c0..1809995 100644
--- a/security/keys/encrypted-keys/encrypted.h
+++ b/security/keys/encrypted-keys/encrypted.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ENCRYPTED_KEY_H
 #define __ENCRYPTED_KEY_H
 
diff --git a/security/keys/trusted.h b/security/keys/trusted.h
index ff001a5..8d5fe9e 100644
--- a/security/keys/trusted.h
+++ b/security/keys/trusted.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __TRUSTED_KEY_H
 #define __TRUSTED_KEY_H
 
diff --git a/security/min_addr.c b/security/min_addr.c
index f728728..94d2b0c 100644
--- a/security/min_addr.c
+++ b/security/min_addr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/security.h>
diff --git a/security/selinux/Makefile b/security/selinux/Makefile
index ff5895e..c7161f8 100644
--- a/security/selinux/Makefile
+++ b/security/selinux/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for building the SELinux module as part of the kernel tree.
 #
diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h
index a5004e9..57d61cf 100644
--- a/security/selinux/include/avc.h
+++ b/security/selinux/include/avc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Access vector cache interface for object managers.
  *
diff --git a/security/selinux/include/avc_ss.h b/security/selinux/include/avc_ss.h
index 37d57da..3bcc727 100644
--- a/security/selinux/include/avc_ss.h
+++ b/security/selinux/include/avc_ss.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Access vector cache interface for the security server.
  *
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index 35ffb29..cc35695 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/capability.h>
 
 #define COMMON_FILE_SOCK_PERMS "ioctl", "read", "write", "create", \
diff --git a/security/selinux/include/initial_sid_to_string.h b/security/selinux/include/initial_sid_to_string.h
index a59b64e..4f93f69 100644
--- a/security/selinux/include/initial_sid_to_string.h
+++ b/security/selinux/include/initial_sid_to_string.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* This file is automatically generated.  Do not edit. */
 static const char *initial_sid_to_string[] =
 {
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 28dfb2f..02f0412 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Security server interface.
  *
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 36a7ce9..1f173a7 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * SELinux support for the XFRM LSM hooks
  *
diff --git a/security/selinux/ss/constraint.h b/security/selinux/ss/constraint.h
index 33ae2ae..4e563be 100644
--- a/security/selinux/ss/constraint.h
+++ b/security/selinux/ss/constraint.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * A constraint is a condition that must be satisfied in
  * order for one or more permissions to be granted.
diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
index a2c0f37c..2260c44 100644
--- a/security/selinux/ss/context.h
+++ b/security/selinux/ss/context.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * A security context is a set of security attributes
  * associated with each subject and object controlled
diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c
index fc28149..b6a78b0 100644
--- a/security/selinux/ss/ebitmap.c
+++ b/security/selinux/ss/ebitmap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Implementation of the extensible bitmap type.
  *
diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h
index da1325d..edf4fa3 100644
--- a/security/selinux/ss/ebitmap.h
+++ b/security/selinux/ss/ebitmap.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * An extensible bitmap is a bitmap that supports an
  * arbitrary number of bits.  Extensible bitmaps are
diff --git a/security/selinux/ss/hashtab.c b/security/selinux/ss/hashtab.c
index 686c391..6bd6dcd 100644
--- a/security/selinux/ss/hashtab.c
+++ b/security/selinux/ss/hashtab.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Implementation of the hash table type.
  *
diff --git a/security/selinux/ss/hashtab.h b/security/selinux/ss/hashtab.h
index 009fb5e..3e3e42b 100644
--- a/security/selinux/ss/hashtab.h
+++ b/security/selinux/ss/hashtab.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * A hash table (hashtab) maintains associations between
  * key values and datum values.  The type of the key values
diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
index d9dc34f4..ad982ce 100644
--- a/security/selinux/ss/mls.c
+++ b/security/selinux/ss/mls.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Implementation of the multi-level security (MLS) policy.
  *
diff --git a/security/selinux/ss/mls.h b/security/selinux/ss/mls.h
index 0f0a1d6..131d762 100644
--- a/security/selinux/ss/mls.h
+++ b/security/selinux/ss/mls.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Multi-level security (MLS) policy operations.
  *
diff --git a/security/selinux/ss/mls_types.h b/security/selinux/ss/mls_types.h
index 47f3702..068e0d7 100644
--- a/security/selinux/ss/mls_types.h
+++ b/security/selinux/ss/mls_types.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Type definitions for the multi-level security (MLS) policy.
  *
diff --git a/security/selinux/ss/services.h b/security/selinux/ss/services.h
index 3d9fa95..356bdd3 100644
--- a/security/selinux/ss/services.h
+++ b/security/selinux/ss/services.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Implementation of the security services.
  *
diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index 6ae08ef..5be31b7 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Implementation of the SID table type.
  *
diff --git a/security/selinux/ss/sidtab.h b/security/selinux/ss/sidtab.h
index de5d0ea..a1a1d26 100644
--- a/security/selinux/ss/sidtab.h
+++ b/security/selinux/ss/sidtab.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * A security identifier table (sidtab) is a hash table
  * of security context structures indexed by SID value.
diff --git a/security/selinux/ss/symtab.c b/security/selinux/ss/symtab.c
index d1a6745..dc2ce94 100644
--- a/security/selinux/ss/symtab.c
+++ b/security/selinux/ss/symtab.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Implementation of the symbol table type.
  *
diff --git a/security/selinux/ss/symtab.h b/security/selinux/ss/symtab.h
index 0bc12d5..d75fcaf 100644
--- a/security/selinux/ss/symtab.h
+++ b/security/selinux/ss/symtab.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * A symbol table (symtab) maintains associations between symbol
  * strings and datum values.  The type of the datum values
diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile
index 65dbcb2..b7c6a7f 100644
--- a/security/tomoyo/Makefile
+++ b/security/tomoyo/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 obj-y = audit.o common.o condition.o domain.o environ.o file.o gc.o group.o load_policy.o memory.o mount.o network.o realpath.o securityfs_if.o tomoyo.o util.o
 
 targets += builtin-policy.h
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
index 3ffa4f5..d330b06 100644
--- a/security/tomoyo/audit.c
+++ b/security/tomoyo/audit.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/audit.c
  *
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index e0fb750..21691b9 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/common.c
  *
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 361e7a2..e4097d7 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * security/tomoyo/common.h
  *
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
index 6c4528d..8d0e1b9 100644
--- a/security/tomoyo/condition.c
+++ b/security/tomoyo/condition.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/condition.c
  *
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 00d223e..f6758da 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/domain.c
  *
diff --git a/security/tomoyo/environ.c b/security/tomoyo/environ.c
index ad4c6e1..7f0a471 100644
--- a/security/tomoyo/environ.c
+++ b/security/tomoyo/environ.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/environ.c
  *
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 223f21f..2a374b4d 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/file.c
  *
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index 540bc29..e22bea8 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/gc.c
  *
diff --git a/security/tomoyo/group.c b/security/tomoyo/group.c
index 944ad77..21b0cc3 100644
--- a/security/tomoyo/group.c
+++ b/security/tomoyo/group.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/group.c
  *
diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c
index 078fac0..81b9516 100644
--- a/security/tomoyo/load_policy.c
+++ b/security/tomoyo/load_policy.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/load_policy.c
  *
diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c
index 1598b55..12477e0 100644
--- a/security/tomoyo/memory.c
+++ b/security/tomoyo/memory.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/memory.c
  *
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 14b53fb..807fd91 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/mount.c
  *
diff --git a/security/tomoyo/network.c b/security/tomoyo/network.c
index 6c02ac4..cd6932e 100644
--- a/security/tomoyo/network.c
+++ b/security/tomoyo/network.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/network.c
  *
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index a97b275..6ff8c21 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/realpath.c
  *
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index 06ab41b1..49393c2 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/securityfs_if.c
  *
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index d25b705..213b8c5 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/tomoyo.c
  *
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 848317f..580b318 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/util.c
  *