1. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      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: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  2. 06 Jun, 2014 2 commits
    • Hin-Tak Leung's avatar
      hfsplus: remove unused routine hfsplus_attr_build_key_uni · 7f2fc81e
      Hin-Tak Leung authored
      The directory/file catalog b-tree equivalent, hfsplus_build_key_uni(),
      is used by hfsplus_find_cat() for internal referencing between catalog
      records.  There is no corresponding usage for attributes - attribute
      records do not refer to one another.
      Signed-off-by: default avatarHin-Tak Leung <htl10@users.sourceforge.net>
      Cc: Sougata Santra <sougata@tuxera.com>
      Cc: Anton Altaparmakov <anton@tuxera.com>
      Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Christoph Hellwig <hch@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7f2fc81e
    • Hin-Tak Leung's avatar
      hfsplus: correct usage of HFSPLUS_ATTR_MAX_STRLEN for non-English attributes · bf29e886
      Hin-Tak Leung authored
      HFSPLUS_ATTR_MAX_STRLEN (=127) is the limit of attribute names for the
      number of unicode character (UTF-16BE) storable in the HFS+ file system.
      Almost all the current usage of it is wrong, in relation to NLS to
      on-disk conversion.
      
      Except for one use calling hfsplus_asc2uni (which should stay the same)
      and its uses in calling hfsplus_uni2asc (which was corrected in the
      earlier patch in this series concerning usage of hfsplus_uni2asc), all
      the other uses are of the forms:
      
      - char buffer[size]
      
      - bound check: "if (namespace_adjusted_input_length > size) return failure;"
      
      Conversion between on-disk unicode representation and NLS char strings
      (in whichever direction) always needs to accommodate the worst-case NLS
      conversion, so all char buffers of that size need to have a
      NLS_MAX_CHARSET_SIZE x .
      
      The bound checks are all wrong, since they compare nls_length derived
      from strlen() to a unicode length limit.
      
      It turns out that all the bound-checks do is to protect
      hfsplus_asc2uni(), which can fail if the input is too large.
      
      There is only one usage of it as far as attributes are concerned, in
      hfsplus_attr_build_key().  It is in turn used by hfsplus_find_attr(),
      hfsplus_create_attr(), hfsplus_delete_attr().  Thus making sure that
      errors from hfsplus_asc2uni() is caught in hfsplus_attr_build_key() and
      propagated is sufficient to replace all the bound checks.
      
      Unpropagated errors from hfsplus_asc2uni() in the file catalog code was
      addressed recently in an independent patch "hfsplus: fix longname
      handling" by Sougata Santra.
      
      Before this patch, trying to set a 55 CJK character (in a UTF-8 locale,
      > 127/3=42) attribute plus user prefix fails with:
      
          $ setfattr -n user.`cat testing-string` -v `cat testing-string` \
              testing-string
          setfattr: testing-string: Operation not supported
      
      and retrieving a stored long attributes is particular ugly(!):
      
          find /mnt/* -type f -exec getfattr -d {} \;
          getfattr: /mnt/testing-string: Input/output error
      
      with console log:
          [268008.389781] hfsplus: unicode conversion failed
      
      After the patch, both of the above works.
      
      FYI, the test attribute string is prepared with:
      
      echo -e -n \
      "\xe9\x80\x99\xe6\x98\xaf\xe4\xb8\x80\xe5\x80\x8b\xe9\x9d\x9e\xe5" \
      "\xb8\xb8\xe6\xbc\xab\xe9\x95\xb7\xe8\x80\x8c\xe6\xa5\xb5\xe5\x85" \
      "\xb6\xe4\xb9\x8f\xe5\x91\xb3\xe5\x92\x8c\xe7\x9b\xb8\xe7\x95\xb6" \
      "\xe7\x84\xa1\xe8\xb6\xa3\xe3\x80\x81\xe4\xbb\xa5\xe5\x8f\x8a\xe7" \
      "\x84\xa1\xe7\x94\xa8\xe7\x9a\x84\xe3\x80\x81\xe5\x86\x8d\xe5\x8a" \
      "\xa0\xe4\xb8\x8a\xe6\xaf\xab\xe7\x84\xa1\xe6\x84\x8f\xe7\xbe\xa9" \
      "\xe7\x9a\x84\xe6\x93\xb4\xe5\xb1\x95\xe5\xb1\xac\xe6\x80\xa7\xef" \
      "\xbc\x8c\xe8\x80\x8c\xe5\x85\xb6\xe5\x94\xaf\xe4\xb8\x80\xe5\x89" \
      "\xb5\xe5\xbb\xba\xe7\x9b\xae\xe7\x9a\x84\xe5\x83\x85\xe6\x98\xaf" \
      "\xe7\x82\xba\xe4\xba\x86\xe6\xb8\xac\xe8\xa9\xa6\xe4\xbd\x9c\xe7" \
      "\x94\xa8\xe3\x80\x82" | tr -d ' '
      
      (= "pointlessly long attribute for testing", elaborate Chinese in
      UTF-8 enoding).
      
      However, it is not possible to set double the size (110 + 5 is still
      under 127) in a UTF-8 locale:
      
          $setfattr -n user.`cat testing-string testing-string` -v \
              `cat testing-string testing-string` testing-string
          setfattr: testing-string: Numerical result out of range
      
      110 CJK char in UTF-8 is 330 bytes - the generic get/set attribute
      system call code in linux/fs/xattr.c imposes a 255 byte limit.  One can
      use a combination of iconv to encode content, changing terminal locale
      for viewing, and an nls=cp932/cp936/cp949/cp950 mount option to fully
      use 127-unicode attribute in a double-byte locale.
      
      Also, as an additional information, it is possible to (mis-)use unicode
      half-width/full-width forms (U+FFxx) to write attributes which looks
      like english but not actually ascii.
      
      Thanks Anton Altaparmakov for reviewing the earlier ideas behind this
      change.
      
      [akpm@linux-foundation.org: fix build]
      [akpm@linux-foundation.org: fix build]
      Signed-off-by: default avatarHin-Tak Leung <htl10@users.sourceforge.net>
      Cc: Anton Altaparmakov <anton@tuxera.com>
      Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Sougata Santra <sougata@tuxera.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bf29e886
  3. 03 Apr, 2014 1 commit
  4. 01 May, 2013 2 commits
  5. 28 Feb, 2013 1 commit